T8 B15 Hijacked Airplanes 3 Of 3 Fdr- Ntsb Reports On Ua 93
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NATIONAL TRANSPORTATION SAFETY BOARD Office of Research and Engineering a^ Washington, D.C. 20594 *
February 19, 2002 Flight Path Study - United Airlines Flight 93 A.
SUBJECT AIRCRAFT Location: Date: Time: Flight: Aircraft: NTSB#:
B.
Shanksville, PA September 11, 2001 10:03 AM Eastern Daylight Time United Airlines Flight 93 Boeing 757-200, registration: N591UA DCA01MA065
GROUP N/A
C.
SUMMARY
This document provides a brief description of the flight path of the aircraft based on information obtained from various sources of recorded radar of the subject aircraft both before and after the hijacking events. Information from the Flight Data Recorder (FDR) recovered on scene is also used to develop the description. Flight paths are overlaid onto maps of the area, and time histories of altitude data are presented United Airlines Flight 93 - Flight Profile The following profile of United Airlines Flight 93 is based on data from the flight data recorder (FDR) recovered from the crash site, as well as radar data obtained from the Federal Aviation Administration's Air Route Traffic Control Centers and the U.S. Air Force 84th Radar Evaluation Squadron. Figure 1 shows the flight path of the aircraft from take off at Newark, NJ to the crash site near Johnstown, PA. Figure 2 shows the aircraft's altitude profile for the 1 hour and 21 minute duration of the flight.
United flight 93 departed Newark, NJ at 8:42 am (point A in Figures 1 and 2) and reached its assigned cruising altitude of 35,000 feet at about 9:02 am (B). The flight appears normal until a brief descent of about 600 feet starting at 9:28 (C). The words "get out of here" and sounds of a struggle were recorded on the air traffic control radio at FAA's Cleveland Center facility at this time. The Cockpit Voice Recorder (CVR) onboard the airplane began providing sounds from the cockpit at approximately 9:32. At 9:34 (D) the airplane starts to climb from 35,000 feet, and shortly thereafter begins a left turn to a Southeast heading of 120° with the autopilot in heading select mode. The airplane maintained a maximum altitude of 41,000 feet for about 2 minutes and then started descending at about 9:39 (E), with the autopilot in vertical speed mode and at a descent rate of 4,000 feet/minute. Radar stations stopped receiving transponder returns from UAL93 at approximately 9:41. There was a brief interruption in the descent at 9:46 (F) as the airplane climbed from 19,000 feet to 20,500 feet before resuming its descent, but at a slower rate (1,300 feet/minute). At about 9:57 the airplane started a left turn to the east. At 9:59 (G) the airplane was at 5,000 feet when about 2 minutes of rapid, full left and right control wheel inputs resulted in multiple 30 degree rolls to the left and right. From approximately 10:00 to 10:02 there were four distinct control column inputs that caused the airplane to pitch nose-up (climb) and nose-down (dive) aggressively. During this time the airplane climbed to about 10,000 feet while turning to the right. The airplane then pitched nose-down and rolled to the right in response to flight control inputs, and impacted the ground at about 490 knots (563 mph) in a 40 degree nose-down, inverted attitude. The time of impact was 10:03:11.
Ritter Chief, Vehicle Performance Division NTSB
T
Figure 1. UA-93 Radar Ground Track
O
o
O
01
•S'o
A - UAL 93 takes off from Newark, NJ at 0842 EOT. B - UAL 93 levels off at assigned altitude of 35,000 ft. C - 600 foot deviation from assigned altitude (assumed takeover point.) D - Starts climb to 41,000 feet, then turns towards Southeast. E - A t max altitude of 41,000 feet; xponder returns cease 2 m in. later. F - Brief interruption in descent. G - Rapid control wheel inputs; aircraft starts climbing. H -Aircraft noses down and starts rapid descent. I - Aircraft aircraft impacts the ground inverted and at high speed.
Q
LJ 010:03:11 AM I
Figure 2. UA-93 Altitude Profile 45000
40000 -
_
25000 -
Q>
3
20000 -
A - UAL 93 takes off from Newark, NJ at 0842 EOT. B - UAL 93 levels off at assigned altitude of 35,000 ft. C - 600 foot deviation from assigned altitude (assumed takeover point.) D -Starts climb to 41,000 feet, then turns towards Southeast. E - At max altitude of 41,000 feet; xponder returns cease 2 min. later. F - Brief interruption in descent. G - Rapid control wheel inputs; aircraft starts climbing. H -Aircraft noses down and starts rapid descent. I - Aircraft aircraft Impacts the ground inverted and at high speed.
08:30:00
08:40:00
08:50:00
09:00:00
09:10:00
09:20:00
09:30:00
09:40:00
Eastern Daylight Time, HH:MM:SS (= UTC - 4 Hours) 4
09:50:00
10:00:00
10:
8:41:49 LC 8:41:53 UAL-93 8:42:07 LC 8:42:41 LC 8:42:43 UAL-93 8:43:00 UAL-93 8:43:04 E155 8:43:12 UAL-93 8:43:48 E155 8:43:52 UAL-93 8:44:34 E155 8:44:38 UAL-93 8:45:10 E155 8:45:13 UAL-93 8:45:54 E155 8:46:00 UAL-93 8:46:18 UAL-93 8:46:23 B43 8:46:26 UAL-93 8:48:03 B43 8:48:07 UAL-93 8:48:41 B43 8:48:44 UAL-93 8:49:31 B43 8:49:35 UAL-93 8:50.37 B43 8:50:41 UAL-93 8:50:57 UAL-93 8:51:03 R39 8:51:07 UAL-93 8:54:09 R39 8:54:12 UAL-93
United ninety three wind three three zero at seven runway four left cleared for takeoff. [EWR 1235-1247 LC] cleared takeoff four left United ninety three. [EWR 1235-1247 LC] United ninety three. [EWR 1235-1247 LC] United ninety three contact departure. [EWR 1235-1247 LC] going to departure United ninety three good day. [EWR 1235-1247 LC] United ninety three fourteen hundred for twenty five hundred. [N90 12381256 Newark Dept.] United ninety three New York departure good morning radar contact climb and maintain eight thousand and turn left heading three three zero vector for ELIOT. [N90 1238-1256 Newark Dept.] eight thousand heading three three zero for ELIOT United ninety three. [N90 1238-1256 Newark Dept.] United ninety three turn left heading uh two eight zero. [N90 1238-1256 Newark Dept.] left two eighty United ninety three. [N90 1238-1256 Newark Dept.] United ninety three climb and maintain one zero thousand. [N90 1238-1256 Newark Dept.] climb and maintain one zero thousand ten thousand United ninety three. [N90 1238-1256 Newark Dept.] United ninety three do not exceed two five zero knots. [N90 1238-1256 Newark Dept.] not exceed two fifty United ninety three. [N90 1238-1256 Newark Dept.] United ninety three resume normal speed contact departure one three five point three five. [N90 1238-1256 Newark Dept.] one three five three five normal speed good day United ninety three. [N90 1238-1256 Newark Dept.] United ninety three is with you one zero thousand, normal speed, heading two eighty. [N90 1238-1256 Liberty West] United ninety three departure good morning, climb maintain one four thousand. [N90 1238-1256 Liberty West] climb maintain one four thousand United ninety three. [N90 1238-1256 Liberty West] United ninety three right turn heading of ah three one zero. [N90 1238-1256 Liberty West] right heading three one zero United ninety three. [N90 1238-1256 Liberty West] United ninety three climb maintain one six thousand. [N90 1238-1256 Liberty West] climb maintain one six thousand United ninety three. [N90 1238-1256 Liberty West] United ninety three climb maintain one seven thousand go direct ELIOT on course. [N90 1238-1256 Liberty West] up to one seven thousand direct ELIOT United ninety three. [N90 12381256 Liberty West] United ninety three contact New York center one three two point one good day. [N90 1238-1256 Liberty West] thirty two one good day United ninety three. [N90 1238-1256 Liberty West] and New York United ninety three with you one seven thousand. [ZNY 1245-1258 R39] United ninety three New York center climb and maintain flight level two eight zero. [ZNY 1245-1258 R39] maintain two eight oh United ninety three. [ZNY 1245-1258 R39] United ninety three cleared direct DEMO. [ZNY 1245-1258 R39] direct DEMO United ninety three. [ZNY 1245-1258 R39]
8:54:53 R39
8:54:59 UAL-93 8:55:05 UAL-93 8:55:09 R73 8:57:12 R73 8:57:16 UAL-93 9:22:20 UAL-93 9:22:26 RA73 9:22:37 UAL-93 9:23:00 ACARS 9:23:05 UAL-93 9:23:14 FKL-R 9:23:56 FKL-R 9:24:00 UAL-93 9:24:20 UAL-93 9:25:06 UAL-93 9:25:08 LOR-R 9:27:25 LOR-R 9:27:30 UAL-93 9:28:16 UAL-93 9:28:48 UAL-93 9:29:14 LOR-R 9:29:20 LOR-R 9:29:34 LOR-R 9:29:40 LOR-R 9:29:56 LOR-R 9:30:03 LOR-R 9:30:58 LOR-R 9:31:55 UAL-93 9:32:05 LOR-R 9:35:36 LOR-R
United ninety three contact New York center one three three point four correction New York center one thirty two eighty seven. [ZNY1245-1258 R39] one thirty two eighty seven good day United uh ninety three. [ZNY 12451258R39] good morning New York United ninety three with you twenty five and a half for two eight oh. [ZNY 1250-1328 R73] United ninety three New York center good morning. [ZNY 1250-1328 R73] United ninety three climb and maintain flight level three five zero. [ZNY 1250-1328 R73] leaving two eight for three five oh United ninety three. [ZNY 1250-1328 R73] United ninety three starting to pick up some light chop at thirty five, any ride reports? [ZNY 1308-1328 RA73] the ah first complained I've had and United ah ninety three, contact the Cleveland center now on one three three point zero seven. [ZNY 13081328 RA73] thrity three oh seven United ninety three. [ZNY 1308-1328 RA73] BEWARE ANY COCKPIT INTROUSION. . TWO AIRCRAFT IN NY, HIT TRADE CNTER BUILDS morning Cleveland it's United ninety three with you at three five oh ah there's some light chop here at thirty five any ride reports? [ZOB 13:0113:31 Franklin-R] an no just a little light chop nothing worse than that United ninety three. [ZOB 13:01-13:31 Franklin-R] United ninety three Cleveland one three three three seven. [ZOB 13011331 Franklin-R] one three three three seven good day United ninety three. [ZOB 1301-1331 Franklin-R] good morning Cleveland United ninety three is with you at three five oh intermittent light chop. [ZOB 1314-1333 Lorain-R] United ninety three checking in three five oh. [ZOB 1314-1333 Lorain-R] United ninety three three five zero roger. [ZOB 1314-1333 Lorain-R] United ninety three that traffic for you is one o'clock twelve miles east bound three seven zero. [ZOB 1314-1333 Lorain-R] negative contact we're looking United ninety three. [ZOB 1314-1333 Lorain-R] *** (mayday) *** (hey get out of here) ***. [ZOB 1314-1333 Lorain-R] *** (get out of here) *** (get out of here). [ZOB 1314-1333 Lorain-R] United ninety three verify three five zero. [ZOB 1314-1333 Lorain-R] United ninety three verify you're at flight level ah three five zero. [ZOB 1314-1333 Lorain-R] United ninety three verify you're level at three five zero. [ZOB 1314-1333 Lorain-R] United ninety three Cleveland. [ZOB 1314-1333 Lorain-R] United ninety three Cleveland. [ZOB 1314-1333 Lorain-R] United ninety three if you hear Cleveland center ident please. [ZOB 13141333 Lorain-R] United ninety three Cleveland if you hear the center ident. [ZOB 1314-1333 Lorain-R] *** please sit down, keep remaining seating, we have a bomb on board, so ***. [ZOB 1314-1333 Lorain-R] er uh calling Cleveland center you're unreadable say again slowly. [ZOB 1314-1333 Lorain-R] ah United ninety three if able * ah squawk trip please. [ZOB 1333-1344
9:36:51 LOR-R 9:39:10 UAL-93 9:39:19 LOR-R 9:39:24 LOR-R 9:40:04 LOR-R 9:40:12 LOR-R 9:41:01 LOR-R 9:41:36 LOR-R 9:45:29 LOR-R 9:45:35 LOR-R 9:46:13 LOR-R 9:47:28 LOR-R 9:48:39 LOR-R
Lorain-R] [Cleveland center announces that UAL93 is turning south and east and climbing]. [ZOB 1333-1344 Lorain-R] ah this is the captain uh would like to all remain seated there is a bomb aboard and we go back to the airport and to have our demands so please remain quiet. [ZOB 1333-1344 Lorain-R] okay thats United ninety three calling? [ZOB 1333-1344 Lorain-R] United ninety three understand you have a bomb on board go ahead. [ZOB 1333-1344 Lorain-R] United ninety three go ahead. [ZOB 1333-1344 Lorain-R] _ United ninety three go ahead. [ZOB 1333-1344 Lorain-R] > United ninety three do you hear Cleveland center? [ZOB 1333-1344 LorainR] [Cleveland center announces loss of transponder signal from UAL93] [ZOB 1333-1344 Lorain-R] United ninety three Cleveland do you still hear the center? [ZOB 13441400 Lorain-R] United ninety three do you still hear Cleveland? [ZOB 1344-1400 Lorain-R] United ninety three United ninerthree do you hear Cleveland? [ZOB 13441400 Lorain-R] United ninety three United ninety three Cleveland. [ZOB 1344-1400 LorainR] United ninety three United ninety three do you hear Cleveland center. [ZOB 1344-1400 Lorain-R]
NATIONAL TRANSPORTATION SAFETY BOARD Vehicle Recorders Division Washington, D.C. 20594
December 21, 2001
Air Traffic Control Recording Specialist's Report by Joseph A. Gregor
A. ACCIDENT Location:
Shanksville, PA
Date:
September 11, 2001
Time:1 Aircraft:
Boeing 757
NTSB Number:
DCA01SA065
B. GROUP N/A
C. SUMMARY On September 11, 2001 United Airlines Flight 93, a Boeing 757 crashed near Shanksville, PA. A certified analog copy of air traffic control (ATC) transmissions recorded on September 11, 2001 at various tower, departure, and Air Route Traffic Control Center (ARTCC) positions along the route of flight was sent to the audio laboratory of the National Transportation Safety Board. These recordings were used to create an audio and text transcript of the aircratt-ground communications from takeoff to accident time.
- II -
D. DETAILS OF INVESTIGATION Transmissions between the accident aircraft and ATC were recorded and an analog copy was sent to the Safety Board's audio laboratory. The tapes cover the following ATC positions and time periods:
Facility
Time Period1 (UTC)
Position
EWR
1235-1247 1238-1256 1238-1256 1245-1258 1250-1328
LC E155 B43 Sector 39R Sector 73R FKL-R LOR-R LOR-R LOR-R
N90 N90
ZNY ZNY ZOB ZOB ZOB ZOB
1301 -1331 1314-1333 1333-1344 1344-1400
Sections of the tape recordings containing air-ground transmissions to and from the incident aircraft were digitized at a 22,050 Samples/second data rate and saved as standard Microsoft .wav files, individual .wav files were combined into a single 1 hour 3 minute 19 second long .wav file containing all transmissions to and from the incident aircraft from 1241:49 UTC (aircraft cleared for takeoff) to 1348:47 UTC. A transcript was obtained from the final composite recording. Times are approximate due to limitations inherent in the data obtained from the FAA.
Joseph A. Gregor Electrical Engineer
- Ill -
Transcript of ATC communications with a Boeing B-757 (United Airlines flight 93) which crashed near Shanksville, PA on September 11, 2001.
LEGEND UAL-93
Radio transmission from United B-757, flight 93
LC
Radio transmission from Local Control
E155
Radio transmission from Newark Departure
B43
Radio transmission from Liberty West
39R
Radio transmission from Sector 39 Radar position
73R
Radio transmission from Sector 73 Radar position
FKL-R
Radio transmission from Franklin Radar position
LOR-R
Radio transmission from Lorain Radar position
*
Unintelligible word
#
Expletive
( )
Questionable insertion
[ ]
Editorial insertion Pause
-
Interruption
Note 1: Times are expressed in universal coordinated time (UTC). Note 2: Only radio transmissions to and from the accident aircraft were transcribed. Note 3: Words shown with excess vowels, letters, or drawn out syllables are a phonetic representation of the words as spoken.
Page 1 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
CONTENT
Start of recording
Start of transcript 1241:49* LC
1241:53* UAL-93 1242:07* LC 1242:41* LC 1242:43* UAL-93 1243:00 UAL-93
United ninety three wind three three zero at seven runway four left cleared for takeoff. [EWR 1235-1247 LC] cleared takeoff four left United ninety three. [EWR 12351247LC] United ninety three. [EWR 1235-1247 LC] United ninety three contact departure. [EWR 1235-1247 LC] going to departure United ninety three good day. [EWR 1235-1247 LC] United ninety three fourteen hundred for twenty five hundred. [N90 1238-1256 Newark Dept.]
Page 2 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE 1243:04 E155
1243:12 UAL-93
1243:48 E155
1243:52 UAL-93
1244:34 E155
1244:38 UAL-93 1245:10 E155 1245:13 UAL-93
CONTENT
United ninety three New York departure good morning radar contact climb and maintain eight thousand and turn left heading three three zero vector for ELIOT. [N90 1238-1256 Newark Dept.] eight thousand heading three three zero for ELIOT United ninety three. [N90 1238-1256 Newark Dept.] United ninety three turn left heading uh two eight zero. [N90 1238-1256 Newark Dept.] left two eighty United ninety three. [N90 1238-1256 Newark Dept.] United ninety three dimb and maintain one zero thousand. [N90 1238-1256 Newark Dept.] climb and maintain one zero thousand ten thousand United ninety three. [N90 1238-1256 Newark Dept.] United ninety three do not exceed two five zero knots. [N90 1238-1256 Newark Dept.] not exceed two fifty United ninety three. [N90 1238-1256 Newark Dept.]
Page 3 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
1245:54 E155
1246:00 UAL-93 1246:18* UAL-93
1246:23* B43
1246:26* UAL-93 1248:03* B43 1248:07* UAL-93 1248:41* B43
CONTENT
United ninety three resume normal speed contact departure one three five point three five. [N90 12381256 Newark Dept.] one three five three five normal speed good day United ninety three. [N90 1238-1256 Newark Dept.] United ninety three is with you one zero thousand, normal speed, heading two eighty. [N90 1238-1256 Liberty West] United ninety three departure good morning, climb maintain one four thousand. [N90 1238-1256 Liberty West] climb maintain one four thousand United ninety three. [N90 1238-1256 Liberty West] United ninety three right turn heading of ah three one zero. [N90 1238-1256 Liberty West] right heading three one zero United ninety three. [N90 1238-1256 Liberty West] United ninety three climb maintain one six thousand. [N90 1238-1256 Liberty West]
Page 4 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
1248:44* UAL-93
CONTENT
climb maintain one six thousand United ninety three. [N90 1238-1256 Liberty West]
1249:31* B43
1249:35* UAL-93
United ninety three climb maintain one seven thousand go direct ELIOT on course. [N90 1238-1256 Liberty West] up to one seven thousand direct ELIOT United ninety three. [N90 1238-1256 Liberty West]
1250:37* B43
1250:41* UAL-93 1250:57* UAL-93
United ninety three contact New York center one three two point one good day. [N90 1238-1256 Liberty West] thirty two one good day United ninety three. [N90 12381256 Liberty West] and New York United ninety three with you one seven thousand. [ZNY 1245-1 258 R39]
1251:03 R39
1251:07 UAL-93
United ninety three New York center climb and maintain flight level two eight zero. [ZNY 1245-1258 R39] maintain two eight oh United ninety three. {ZNY 12451258R39]
1254:09* R39
United ninety three cleared direct DEMO. [ZNY 12451258 R39]
Page 5 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
1254:12 UAL-93 1254:53 R39
1254:59* UAL-93 1255:05* UAL-93
1255:09* R73 1257:12* R73 1257:16* UAL-93 1322:20 UAL-93
CONTENT
direct DEMO United ninety three. [ZNY 1245-1258 R39] United ninety three contact New York center one three three point four correction New York center one thirty two eighty seven. [ZNY 1245-1258 R39] one thirty two eighty seven good day United uh ninety three. [ZNY 1245-1258 R39] good morning New York United ninety three with you twenty five and a half for two eight oh. [ZNY 1250-1328 R73] United ninety three New York center good morning. [ZNY 1250-1328 R73] United ninety three climb and maintain flight level three five zero. [ZNY 1250-1328 R73] leaving two eight for three five oh United ninety three. [ZNY 1250-1328 R73] United ninety three starting to pick up some light chop at thirty five, any ride reports? [ZNY 1308-1328 RA73]
Page 6 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
1322:26 RA73
1322:37 UAL-93 1323:00 ACARS 1323:05 UAL-93
1323:14 FKL-R 1323:56 FKL-R 1324:00 UAL-93 1324:20* UAL-93
CONTENT
the ah first complained I've had and United ah ninety three, contact the Cleveland center now on one three three point zero seven. [ZNY 1308-1328 RA73] thrity three oh seven United ninety three. [ZNY 13081328RA73] BEWARE ANY COCKPIT INTROUSION. . TWO AIRCRAFT IN NY, HIT TRADE CNTER BUILDS morning Cleveland it's United ninety three with you at three five oh ah there's some light chop here at thirty five any ride reports? [ZOB 1301-1331 Franklin-R] an no just a little light chop nothing worse than that United ninety three. [ZOB 1301-1331 Franklin-R] United ninety three Cleveland one three three three seven. [ZOB 1301-1331 Franklin-R] one three three three seven good day United ninety three. [ZOB 1301-1331 Franklin-R] good morning Cleveland United ninety three is with you at three five oh intermittent light chop. [ZOB 1314-1333 Lorain-R]
Page 7 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE 1325:06* UAL-93 1325:08* LOR-R 1327:25* LOR-R
1327:30* UAL-93 1328:16* UAL-93 1328:48* UAL-93 1329:14* LOR-R 1329:20* LOR-R 1329:34* LOR-R
CONTENT
United ninety three checking in three five oh. [ZOB 1314-1333Lorain-R] United ninety three three five zero roger. [ZOB 13141333Lorain-R] United ninety three that traffic for you is one o'clock twelve miles east bound three seven zero. [ZOB 13141 333 Lorain-R] negative contact we're looking United ninety three. [ZOB 1314-1 333 Lorain-R] *** (mayday) *** (hey get out of here) ***. [ZOB 13141 333 Lorain-R] *** (get out of here) — (get out of here). [ZOB 13141333 Lorain-R] United ninety three verify three five zero. [ZOB 1 3141333 Lorain-R] United ninety three verify you're at flight level ah three five zero. [ZOB 1314-1333 Lorain-R] United ninety three verify you're level at three five zero. [ZOB 1314-1333 Lorain-R]
Page 8 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE 1329:40* LOR-R
1329:56 LOR-R
1330:03* LOR-R
1330:58* LOR-R
1331:55* UAL-93
1332:05* LOR-R
1335:36 LOR-R
1336:51 LOR-R
CONTENT
United ninety three Cleveland. [ZOB 1314-1333 LorainR] United ninety three Cleveland. [ZOB 1314-1333 LorainR] United ninety three if you hear Cleveland center ident please. [ZOB 1314-1333 Lorain-R] United ninety three Cleveland if you hear the center ident. [ZOB 1314-1333 Lorain-R] *** please sit down, keep remaining seating, we have a bomb on board, so ***. [ZOB 1314-1333 Lorain-R) er uh calling Cleveland center you're unreadable say again slowly. [ZOB 1314-1333 Lorain-R] ah United ninety three if able * ah squawk trip please. [ZOB 1333-1344 Lorain-R] [Cleveland center announces that UAL93 is turning south and east and climbing]. [ZOB 1333-1344 LorainR]
Page 9 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE 1339:10 UAL-93
1339:19 LOR-R 1339:24 LOR-R 1340:01 LOR-R 1340:12 LOR-R 1341:01 LOR-R 1341:36 LOR-R 1345:29* LOR-R
CONTENT
ah this is the captain uh would like to all remain seated there is a bomb aboard and we go back to the airport and to have our demands so please remain quiet. [ZOB 1333-1 344 Lorain-R] okay thats United ninety three calling? [ZOB 1333-1344 Lorain-R] United ninety three understand you have a bomb on board go ahead. [ZOB 1333-1344 Lorain-R] United ninety three go ahead. [ZOB 1333-1344 LorainR] United ninety three go ahead. [ZOB 1333-1344 LorainR] United ninety three do you hear Cleveland center? [ZOB 1333-1 344 Lorain-R] [Cleveland center announces loss of transponder signal from UAL93] [ZOB 1333-1344 Lorain-R] United ninety three Cleveland do you still hear the center? [ZOB 1344-1400 Lorain-R]
Page 10 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
1345:35* LOR-R 1346:13* LOR-R 1347:28* LOR-R 1348:43 LOR-R
End of transcript
'times verified via FAA timecode reader.
CONTENT
United ninety three do you still hear Cleveland? [ZOB 1344-1400 Lorain-R] United ninety three United niner three do you hear Cleveland? [ZOB 1344-1400 Lorain-R] United ninety three United ninety three Cleveland. [ZOB 1344-1 400 Lorain-R] United ninety three United ninety three do you hear Cleveland center. [ZOB 1344-1400 Lorain-R]
1241:49
LC
1241:53
UAL-93
1242:07 1242:41 1242:43
LC LC UAL-93
1243:00
UAL-93
1243:04
E155
1243:12
UAL- 9 3
1243:48
E155
1243:52
UAL- 9 3
1244:34
E155
1244:38
UAL- 9 3
1245:10
E155
1245:13
UAL- 9 3
1245:54
E155
1246:00
UAL- 9 3
1246:18
UAL- 9 3
1246:23
B43
1246:26
UAL- 9 3
1248:03
B43
1248:07
UAL- 9 3
1248:41
B43
1248:44
UAL- 9 3
1249:31
B43
1249:35
UAL- 9 3
1250:37
B43
1250:41
UAL- 9 3
1250:57
UAL- 9 3
1251:03
R39
United ninety three wind three three zero at seven runway four left cleared for takeoff. [EWR 1235-1247 LC] cleared takeoff four left United ninety three. [EWR 1235-1247 LC] United ninety three. [EWR 1235-1247 LC] United ninety three contact departure. [EWR 1235-1247 LC] going to departure United ninety three good day. [EWR 1235-1247 LC] United ninety three fourteen hundred for twenty five hundred. [N90 1238-1256 Newark Dept.] United ninety three New York departure good morning radar contact climb and maintain eight thousand and turn left heading three three zero vector for ELIOT. [N90 1238-1256 Newark Dept.] eight thousand heading three three zero for ELIOT United ninety three. [N90 1238-1256 Newark Dept.] United ninety three turn left heading uh two eight zero. [N90 1238-1256 Newark Dept.] left two eighty United ninety three. [N90 1238-1256 Newark Dept.] United ninety three climb and maintain one zero thousand. [N90 1238-1256 Newark Dept.] climb and maintain one zero thousand ten thousand United ninety three. [N90 1238-1256 Newark Dept.] United ninety three do not exceed two five zero knots. [N90 1238-1256 Newark Dept.] not exceed two fifty United ninety three. [N90 1238-1256 Newark Dept.] United ninety three resume normal speed contact departure one three five point three five. [N90 1238-1256 Newark Dept.] one three five three five normal speed good day United ninety three. [N90 1238-1256 Newark Dept.] United ninety three is with you one zero thousand, normal speed, heading two eighty. [N90 1238-1256 Liberty West] United ninety three departure good morning, climb maintain one four thousand. [N90 1238-1256 Liberty West] climb maintain one four thousand United ninety three. [N90 1238-1256 Liberty West] United ninety three right turn heading of ah three one zero. [N90 1238-1256 Liberty West] right heading three one zero United ninety three. [N90 12381256 Liberty West] United ninety three climb maintain one six thousand. [N90 1238-1256 Liberty West] climb maintain one six thousand United ninety three. [N90 1238-1256 Liberty West] United ninety three climb maintain one seven thousand go direct ELIOT on course. [N90 1238-1256 Liberty West] up to one seven thousand direct ELIOT United ninety three. [N90 1238r1256 Liberty West] United ninety three contact New York center one three two point one good day. [N90 1238-1256 Liberty West] thirty two one good day United ninety three. [N90 1238-1256 Liberty West] and New York United ninety three with you one seven thousand. [ZNY 1245-1258 R39] United ninety three New York center climb and maintain flight level two eight zero. [ZNY 1245-1258 R39]
1251:07 1254:09 1254:12 1254:53
UAL-93 R39 UAL-93 R39
1254:59* UAL-93 1255:05
UAL-93
1255:09
R73
1257:12
R73
1257:16
UAL-93
1322:20
UAL-93
1322:26
RA73
1322:37
UAL-93
1323:00
ACARS
1323:05
UAL-93
1323:14
FKL-R
1323:56
FKL-R
1324:00
UAL-93
1324:20
UAL-93
1325:06
UAL-93
1325:08
LOR-R
1327:25
LOR-R
1327:30
UAL-93
1328:16
UAL-93
1328:48
UAL-93
1329:14
LOR-R
1329:20
LOR-R
1329:34
LOR-R
1329:40 1329:56
LOR-R LOR-R
maintain two eight oh United ninety three. [ZNY 1245-1258 R39] United ninety three cleared direct DEMO. [ZNY 1245-1258 R39] direct DEMO United ninety three. [ZNY 1245-1258 R39] United ninety three contact New York center one three three point four correction New York center one thirty two eighty seven. [ZNY 1245-1258 R39] one thirty two eighty seven good day United uh ninety three. [ZNY 1245-1258 R39] good morning New York United ninety three with you twenty five and a half for two eight oh. [ZNY 1250-1328 R73] United ninety three New York center good morning. [ZNY 12501328 R73] United ninety three climb and maintain flight level three five zero. [ZNY 1250-1328 R73] leaving two eight for three five oh United ninety three. [ZNY 1250-1328 R73] United ninety three starting to pick up some light chop at thirty five, any ride reports? [ZNY 1308-1328 RA73] the ah first complained I've had and United ah ninety three, contact the Cleveland center now on one three three point zero seven. [ZNY 1308-1328 RA73] thrity three oh seven United ninety three. [ZNY 1308-1328 RA73] BEWARE ANY COCKPIT INTROUSION. . TWO AIRCRAFT IN NY, HIT TRADE CNTER BUILDS morning Cleveland it's United ninety three with you at three five oh ah there's some light chop here at thirty five any ride reports? [ZOB 1301-1331 Franklin-R] an no just a little light chop nothing worse than that United ninety three. [ZOB 1301-1331 Franklin-R] United ninety three Cleveland one three three three seven. [ZOB 1301-1331 Franklin-R] one three three three seven good day United ninety three. [ZOB 1301-1331 Franklin-R] good morning Cleveland United ninety three is with you at three five oh intermittent light chop. [ZOB 1314-1333 Lorain-R] United ninety three checking in three five oh. [ZOB 1314-1333 Lorain-R] United ninety three three five zero roger. [ZOB 1314-1333 Lorain-R] United ninety three that traffic for you is one o'clock twelve miles east bound three seven zero. [ZOB 1314-1333 Lorain-R] negative contact we're looking United ninety three. [ZOB 13141333 Lorain-R] [ZOB 1314-1333 *** (mayday) *** (hey get out of here) *** Lorain-R] *** (get out of here) *** (get out of here). [ZOB 1314-1333 Lorain-R] United ninety three verify three five zero. [ZOB 1314-1333 Lorain-R] United ninety three verify you're at flight level ah three five zero. [ZOB 1314-1333 Lorain-R] United ninety three verify you're level at three five zero. [ZOB 1314-1333 Lorain-R] United ninety three Cleveland. [ZOB 1314-1333 Lorain-R] United ninety three Cleveland. [ZOB 1314-1333 Lorain-R]
1330:03 1330:58 1331:55 1332:05 1335:36 1336:51 1339:10
1339:19 1339:24 1340:01 1340:12 1341:01 1341:36 1345:29 1345:35 1346:13 1347:28 1348:43
LOR-R
United ninety three if you hear Cleveland center ident please. [ZOB 1314-1333 Lorain-R] LOR-R United ninety three Cleveland if you hear the center ident. [ZOB 1314-1333 Lorain-R] UAL-93 *** please sit down, keep remaining seating, we have a bomb on board, so ***. [ZOB 1314-1333 Lorain-R] LOR-R er uh calling Cleveland center you're unreadable say again slowly. [ZOB 1314-1333 Lorain-R] LOR-R ah United ninety three if able * ah squawk trip please. [ZOB 1333-1344 Lorain-R] LOR-R [Cleveland center announces that UAL93 is turning south and east and climbing]. [ZOB 1333-1344 Lorain-R] UAL-93 ah this is the captain uh would like to all remain seated there is a bomb aboard and we go back to the airport and to have our demands so please remain quiet. [ZOB 1333-1344 Lorain-R] LOR-R okay thats United ninety three calling? [ZOB 1333-1344 LorainR] LOR-R United ninety three understand you have a bomb on board go ahead. [ZOB 1333-1344 Lorain-R] LOR-R United ninety three go ahead. [ZOB 1333-1344 Lorain-R] LOR-R United ninety three go ahead. [ZOB 1333-1344 Lorain-R] LOR-R United ninety three do you hear Cleveland center? [ZOB 13331344 Lorain-R] LOR-R [Cleveland center announces loss of transponder signal from UAL93] [ZOB 1333-1344 Lorain-R] LOR-R United ninety three Cleveland do you still hear the center? [ZOB 1344-1400 Lorain-R] LOR-R United ninety three do you still hear Cleveland? [ZOB 13441400 Lorain-R] LOR-R United ninety three United niner three do you hear Cleveland? [ZOB 1344-1400 Lorain-R] LOR-R United ninety three United ninety three Cleveland. [ZOB 13441400 Lorain-R] LOR-R United ninety three United ninety three do you hear Cleveland center. [ZOB 1344-1400 Lorain-R]
United Airlines Flight 93 - Flight Profile
OFFICIAL USE ONLY
The following profile of United Airlines Flight 93 is based on data from the flight data recorder (FDR) recovered from the crash site, as well as radar data obtained from the Federal Aviation Administration's Air Route Traffic Control Centers and the U.S. Air Force 84th Radar Evaluation Squadron. Figure 1 shows the flight path of the aircraft from take off at Newark, NJ to the crash site near Johnstown, PA. Figure 2 shows the aircraft's altitude profile for the 1 hour and 21 minute duration of the flight. United flight 93 departed Newark, NJ at 8:42 am (point A in Figures 1 and 2) and reached its assigned cruising altitude of 35,000 feet at about 9:02 am (B). The flight appears normal until a brief descent of about 600 feet starting at 9:28 (C). The words "get out of here" and sounds of a struggle were recorded on the air traffic control radio at FAA's Cleveland Center facility at this time. The Cockpit Voice Recorder (CVR) onboard the airplane began providing sounds from the cockpit at approximately 9:32. At 9:34 (D) the airplane starts to climb from 35,000 feet, and shortly thereafter begins a left turn to the southeast. The airplane maintained a maximum altitude of 41,000 feet for about 2 minutes and then started descending at about 9:39 (E). Radar stations stopped receiving transponder returns fromUAL93 at approximately 9:41. There was a brief interruption in the descent at 9:46 (F) as the airplane climbed from 19,000 feet to 20,500 feet before resuming its descent. At about 9:57 the airplane started a left turn to the east. Just before 9:59 (G) the airplane was at 5,000 feet when about 2 minutes of rapid, full left and right control wheel inputs resulted in multiple 30 degree rolls to the left and right. From approximately 10:00 to 10:02 (H) there were four distinct control column inputs that caused the airplane to pitch nose-up (climb) and nose-down (dive) aggressively. During this time the airplane climbed to about 10,000 feet while turning to the right. The airplane then pitched nose-down and rolled to the right in response to flight control inputs, and impacted the ground at about 490 knots (563 mph) in a 40 degree nose-down, inverted attitude. The time of impact was 10:03:11.
Figure 1. UA-93 Radar Ground Track A - UAL 93 takes off from Newark, NJ at 0842 EDT. B - UAL 93 levels off at assigned altitude of 35,000 ft. C - 600 foot deviation from assigned altitude. D - Starts climb to 41,000 feet, then turns towards Southeast. E - At max altitude of 41,000 feet; xponder returns cease 2 min. later. F - Brief interruption in descent. G - Evidence of struggle on CVR; aircraft starts climbing. H - Aircraft noses down and starts rapid descent. I - Aircraft aircraft impacts the ground inverted and at high speed.
Q
C
LI 010:03:11 AM
Figure 2. UA-93 Altitude Profile 45000
1 I rI j-~i
_!_.-, !
L.
.L..LJ. 40000 i_
35000
-t30000
"11
25000 0) TJ
20000
I
15000 - U A L 93 takes off from Newark, NJ at 0842 EOT. - UAL 93 levels off at assigned altitude of 35,000 ft. - 600 foot deviation from assigned altitude. - Starts climb to 41,000 feet, then turns towards Southeast. - At max altitude of 41,000 feet; xponder returns cease 2 min. later. - Brief interruption in descent. - Evidence of struggle on CVR; aircraft starts climbing. - Aircraft noses down and starts rapid descent. Aircraft aircraft impacts the ground inverted and at high speed.
10000
5000
I
:30:00
08:40:
08:50:00
I
_|Jl_4..._.
..L.
I
09:00:00 09:10:00 09:20:00 09:30:00 09:40:00 09:50: Eastern Daylight Time, HH/ SS (= UTC - 4 Hours)
10:00:00
10:10:00
February 19, 2002 Flight Path Study - United Airlines Flight 93 A.
SUBJECT AIRCRAFT Location: Date: Time: Flight: Aircraft: NTSB#:
B.
Shanksville, PA September 11, 2001 10:03 AM Eastern Daylight Time United Airlines Flight 93 Boeing 757-200, registration: N591UA DCA01MA065
GROUP N/A
C.
SUMMARY
This document provides a brief description of the flight path of the aircraft based on information obtained from various sources of recorded radar of the subject aircraft both before and after the hijacking events. Information from the Flight Data Recorder (FDR) recovered on scene is also used to develop the description. Flight paths are overlaid onto maps of the area, and time histories of altitude data are presented United Airlines Flight 93 - Flight Profile The following profile of United Airlines Flight 93 is based on data from the flight data recorder (FDR) recovered from the crash site, as well as radar data obtained from the Federal Aviation Administration's Air Route Traffic Control Centers and the U.S. Air Force 84th Radar Evaluation Squadron. Figure 1 shows the flight path of the aircraft from take off at Newark, NJ to the crash site near Johnstown, PA. Figure 2 shows the aircraft's altitude profile for the 1 hour and 21 minute duration of the flight.
United flight 93 departed Newark, NJ at 8:42 am (point A in Figures 1 and 2) and reached its assigned cruising altitude of 35,000 feet at about 9:02 am (B). The flight appears normal until a brief descent of about 600 feet starting at 9:28 (C). The words "get out of here" and sounds of a struggle were recorded on the air traffic control radio at FAA's Cleveland Center facility at this time. The Cockpit Voice Recorder (CVR) onboard the airplane began providing sounds from the cockpit at approximately 9:32. At 9:34 (D) the airplane starts to climb from 35,000 feet, and shortly thereafter begins a left turn to a Southeast heading of 120° with the autopilot in heading select mode. The airplane maintained a maximum altitude of 41,000 feet for about 2 minutes and then started descending at about 9:39 (E), with the autopilot in vertical speed mode and at a descent rate of 4,000 feet/minute. Radar stations stopped receiving transponder returns from UAL93 at approximately 9:41. There was a brief interruption in the descent at 9:46 (F) as the airplane climbed from 19,000 feet to 20,500 feet before resuming its descent, but at a slower rate (1,300 feet/minute). At about 9:57 the airplane started a left turn to the east. At 9:59 (G) the airplane was at 5,000 feet when about 2 minutes of rapid, full left and right control wheel inputs resulted in multiple 30 degree rolls to the left and right. From approximately 10:00 to 10:02 there were four distinct control column inputs that caused the airplane to pitch nose-up (climb) and nose-down (dive) aggressively. During this time the airplane climbed to about 10,000 feet while turning to the right. The airplane then pitched nose-down and rolled to the right in response to flight control inputs, and impacted the ground at about 490 knots (563 mph) in a 40 degree nose-down, inverted attitude. The time of impact was 10:03:11.
Ritter Chief, Vehicle Performance Division NTSB
T
Figure 1. UA-93 Radar Ground Track
O
o
O
01
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A - UAL 93 takes off from Newark, NJ at 0842 EOT. B - UAL 93 levels off at assigned altitude of 35,000 ft. C - 600 foot deviation from assigned altitude (assumed takeover point.) D - Starts climb to 41,000 feet, then turns towards Southeast. E - A t max altitude of 41,000 feet; xponder returns cease 2 m in. later. F - Brief interruption in descent. G - Rapid control wheel inputs; aircraft starts climbing. H -Aircraft noses down and starts rapid descent. I - Aircraft aircraft impacts the ground inverted and at high speed.
Q
LJ 010:03:11 AM I
Figure 2. UA-93 Altitude Profile 45000
40000 -
_
25000 -
Q>
3
20000 -
A - UAL 93 takes off from Newark, NJ at 0842 EOT. B - UAL 93 levels off at assigned altitude of 35,000 ft. C - 600 foot deviation from assigned altitude (assumed takeover point.) D -Starts climb to 41,000 feet, then turns towards Southeast. E - At max altitude of 41,000 feet; xponder returns cease 2 min. later. F - Brief interruption in descent. G - Rapid control wheel inputs; aircraft starts climbing. H -Aircraft noses down and starts rapid descent. I - Aircraft aircraft Impacts the ground inverted and at high speed.
08:30:00
08:40:00
08:50:00
09:00:00
09:10:00
09:20:00
09:30:00
09:40:00
Eastern Daylight Time, HH:MM:SS (= UTC - 4 Hours) 4
09:50:00
10:00:00
10:
8:41:49 LC 8:41:53 UAL-93 8:42:07 LC 8:42:41 LC 8:42:43 UAL-93 8:43:00 UAL-93 8:43:04 E155 8:43:12 UAL-93 8:43:48 E155 8:43:52 UAL-93 8:44:34 E155 8:44:38 UAL-93 8:45:10 E155 8:45:13 UAL-93 8:45:54 E155 8:46:00 UAL-93 8:46:18 UAL-93 8:46:23 B43 8:46:26 UAL-93 8:48:03 B43 8:48:07 UAL-93 8:48:41 B43 8:48:44 UAL-93 8:49:31 B43 8:49:35 UAL-93 8:50.37 B43 8:50:41 UAL-93 8:50:57 UAL-93 8:51:03 R39 8:51:07 UAL-93 8:54:09 R39 8:54:12 UAL-93
United ninety three wind three three zero at seven runway four left cleared for takeoff. [EWR 1235-1247 LC] cleared takeoff four left United ninety three. [EWR 1235-1247 LC] United ninety three. [EWR 1235-1247 LC] United ninety three contact departure. [EWR 1235-1247 LC] going to departure United ninety three good day. [EWR 1235-1247 LC] United ninety three fourteen hundred for twenty five hundred. [N90 12381256 Newark Dept.] United ninety three New York departure good morning radar contact climb and maintain eight thousand and turn left heading three three zero vector for ELIOT. [N90 1238-1256 Newark Dept.] eight thousand heading three three zero for ELIOT United ninety three. [N90 1238-1256 Newark Dept.] United ninety three turn left heading uh two eight zero. [N90 1238-1256 Newark Dept.] left two eighty United ninety three. [N90 1238-1256 Newark Dept.] United ninety three climb and maintain one zero thousand. [N90 1238-1256 Newark Dept.] climb and maintain one zero thousand ten thousand United ninety three. [N90 1238-1256 Newark Dept.] United ninety three do not exceed two five zero knots. [N90 1238-1256 Newark Dept.] not exceed two fifty United ninety three. [N90 1238-1256 Newark Dept.] United ninety three resume normal speed contact departure one three five point three five. [N90 1238-1256 Newark Dept.] one three five three five normal speed good day United ninety three. [N90 1238-1256 Newark Dept.] United ninety three is with you one zero thousand, normal speed, heading two eighty. [N90 1238-1256 Liberty West] United ninety three departure good morning, climb maintain one four thousand. [N90 1238-1256 Liberty West] climb maintain one four thousand United ninety three. [N90 1238-1256 Liberty West] United ninety three right turn heading of ah three one zero. [N90 1238-1256 Liberty West] right heading three one zero United ninety three. [N90 1238-1256 Liberty West] United ninety three climb maintain one six thousand. [N90 1238-1256 Liberty West] climb maintain one six thousand United ninety three. [N90 1238-1256 Liberty West] United ninety three climb maintain one seven thousand go direct ELIOT on course. [N90 1238-1256 Liberty West] up to one seven thousand direct ELIOT United ninety three. [N90 12381256 Liberty West] United ninety three contact New York center one three two point one good day. [N90 1238-1256 Liberty West] thirty two one good day United ninety three. [N90 1238-1256 Liberty West] and New York United ninety three with you one seven thousand. [ZNY 1245-1258 R39] United ninety three New York center climb and maintain flight level two eight zero. [ZNY 1245-1258 R39] maintain two eight oh United ninety three. [ZNY 1245-1258 R39] United ninety three cleared direct DEMO. [ZNY 1245-1258 R39] direct DEMO United ninety three. [ZNY 1245-1258 R39]
8:54:53 R39
8:54:59 UAL-93 8:55:05 UAL-93 8:55:09 R73 8:57:12 R73 8:57:16 UAL-93 9:22:20 UAL-93 9:22:26 RA73 9:22:37 UAL-93 9:23:00 ACARS 9:23:05 UAL-93 9:23:14 FKL-R 9:23:56 FKL-R 9:24:00 UAL-93 9:24:20 UAL-93 9:25:06 UAL-93 9:25:08 LOR-R 9:27:25 LOR-R 9:27:30 UAL-93 9:28:16 UAL-93 9:28:48 UAL-93 9:29:14 LOR-R 9:29:20 LOR-R 9:29:34 LOR-R 9:29:40 LOR-R 9:29:56 LOR-R 9:30:03 LOR-R 9:30:58 LOR-R 9:31:55 UAL-93 9:32:05 LOR-R 9:35:36 LOR-R
United ninety three contact New York center one three three point four correction New York center one thirty two eighty seven. [ZNY1245-1258 R39] one thirty two eighty seven good day United uh ninety three. [ZNY 12451258R39] good morning New York United ninety three with you twenty five and a half for two eight oh. [ZNY 1250-1328 R73] United ninety three New York center good morning. [ZNY 1250-1328 R73] United ninety three climb and maintain flight level three five zero. [ZNY 1250-1328 R73] leaving two eight for three five oh United ninety three. [ZNY 1250-1328 R73] United ninety three starting to pick up some light chop at thirty five, any ride reports? [ZNY 1308-1328 RA73] the ah first complained I've had and United ah ninety three, contact the Cleveland center now on one three three point zero seven. [ZNY 13081328 RA73] thrity three oh seven United ninety three. [ZNY 1308-1328 RA73] BEWARE ANY COCKPIT INTROUSION. . TWO AIRCRAFT IN NY, HIT TRADE CNTER BUILDS morning Cleveland it's United ninety three with you at three five oh ah there's some light chop here at thirty five any ride reports? [ZOB 13:0113:31 Franklin-R] an no just a little light chop nothing worse than that United ninety three. [ZOB 13:01-13:31 Franklin-R] United ninety three Cleveland one three three three seven. [ZOB 13011331 Franklin-R] one three three three seven good day United ninety three. [ZOB 1301-1331 Franklin-R] good morning Cleveland United ninety three is with you at three five oh intermittent light chop. [ZOB 1314-1333 Lorain-R] United ninety three checking in three five oh. [ZOB 1314-1333 Lorain-R] United ninety three three five zero roger. [ZOB 1314-1333 Lorain-R] United ninety three that traffic for you is one o'clock twelve miles east bound three seven zero. [ZOB 1314-1333 Lorain-R] negative contact we're looking United ninety three. [ZOB 1314-1333 Lorain-R] *** (mayday) *** (hey get out of here) ***. [ZOB 1314-1333 Lorain-R] *** (get out of here) *** (get out of here). [ZOB 1314-1333 Lorain-R] United ninety three verify three five zero. [ZOB 1314-1333 Lorain-R] United ninety three verify you're at flight level ah three five zero. [ZOB 1314-1333 Lorain-R] United ninety three verify you're level at three five zero. [ZOB 1314-1333 Lorain-R] United ninety three Cleveland. [ZOB 1314-1333 Lorain-R] United ninety three Cleveland. [ZOB 1314-1333 Lorain-R] United ninety three if you hear Cleveland center ident please. [ZOB 13141333 Lorain-R] United ninety three Cleveland if you hear the center ident. [ZOB 1314-1333 Lorain-R] *** please sit down, keep remaining seating, we have a bomb on board, so ***. [ZOB 1314-1333 Lorain-R] er uh calling Cleveland center you're unreadable say again slowly. [ZOB 1314-1333 Lorain-R] ah United ninety three if able * ah squawk trip please. [ZOB 1333-1344
9:36:51 LOR-R 9:39:10 UAL-93 9:39:19 LOR-R 9:39:24 LOR-R 9:40:04 LOR-R 9:40:12 LOR-R 9:41:01 LOR-R 9:41:36 LOR-R 9:45:29 LOR-R 9:45:35 LOR-R 9:46:13 LOR-R 9:47:28 LOR-R 9:48:39 LOR-R
Lorain-R] [Cleveland center announces that UAL93 is turning south and east and climbing]. [ZOB 1333-1344 Lorain-R] ah this is the captain uh would like to all remain seated there is a bomb aboard and we go back to the airport and to have our demands so please remain quiet. [ZOB 1333-1344 Lorain-R] okay thats United ninety three calling? [ZOB 1333-1344 Lorain-R] United ninety three understand you have a bomb on board go ahead. [ZOB 1333-1344 Lorain-R] United ninety three go ahead. [ZOB 1333-1344 Lorain-R] _ United ninety three go ahead. [ZOB 1333-1344 Lorain-R] > United ninety three do you hear Cleveland center? [ZOB 1333-1344 LorainR] [Cleveland center announces loss of transponder signal from UAL93] [ZOB 1333-1344 Lorain-R] United ninety three Cleveland do you still hear the center? [ZOB 13441400 Lorain-R] United ninety three do you still hear Cleveland? [ZOB 1344-1400 Lorain-R] United ninety three United ninerthree do you hear Cleveland? [ZOB 13441400 Lorain-R] United ninety three United ninety three Cleveland. [ZOB 1344-1400 LorainR] United ninety three United ninety three do you hear Cleveland center. [ZOB 1344-1400 Lorain-R]
NATIONAL TRANSPORTATION SAFETY BOARD Vehicle Recorders Division Washington, D.C. 20594
December 21, 2001
Air Traffic Control Recording Specialist's Report by Joseph A. Gregor
A. ACCIDENT Location:
Shanksville, PA
Date:
September 11, 2001
Time:1 Aircraft:
Boeing 757
NTSB Number:
DCA01SA065
B. GROUP N/A
C. SUMMARY On September 11, 2001 United Airlines Flight 93, a Boeing 757 crashed near Shanksville, PA. A certified analog copy of air traffic control (ATC) transmissions recorded on September 11, 2001 at various tower, departure, and Air Route Traffic Control Center (ARTCC) positions along the route of flight was sent to the audio laboratory of the National Transportation Safety Board. These recordings were used to create an audio and text transcript of the aircratt-ground communications from takeoff to accident time.
- II -
D. DETAILS OF INVESTIGATION Transmissions between the accident aircraft and ATC were recorded and an analog copy was sent to the Safety Board's audio laboratory. The tapes cover the following ATC positions and time periods:
Facility
Time Period1 (UTC)
Position
EWR
1235-1247 1238-1256 1238-1256 1245-1258 1250-1328
LC E155 B43 Sector 39R Sector 73R FKL-R LOR-R LOR-R LOR-R
N90 N90
ZNY ZNY ZOB ZOB ZOB ZOB
1301 -1331 1314-1333 1333-1344 1344-1400
Sections of the tape recordings containing air-ground transmissions to and from the incident aircraft were digitized at a 22,050 Samples/second data rate and saved as standard Microsoft .wav files, individual .wav files were combined into a single 1 hour 3 minute 19 second long .wav file containing all transmissions to and from the incident aircraft from 1241:49 UTC (aircraft cleared for takeoff) to 1348:47 UTC. A transcript was obtained from the final composite recording. Times are approximate due to limitations inherent in the data obtained from the FAA.
Joseph A. Gregor Electrical Engineer
- Ill -
Transcript of ATC communications with a Boeing B-757 (United Airlines flight 93) which crashed near Shanksville, PA on September 11, 2001.
LEGEND UAL-93
Radio transmission from United B-757, flight 93
LC
Radio transmission from Local Control
E155
Radio transmission from Newark Departure
B43
Radio transmission from Liberty West
39R
Radio transmission from Sector 39 Radar position
73R
Radio transmission from Sector 73 Radar position
FKL-R
Radio transmission from Franklin Radar position
LOR-R
Radio transmission from Lorain Radar position
*
Unintelligible word
#
Expletive
( )
Questionable insertion
[ ]
Editorial insertion Pause
-
Interruption
Note 1: Times are expressed in universal coordinated time (UTC). Note 2: Only radio transmissions to and from the accident aircraft were transcribed. Note 3: Words shown with excess vowels, letters, or drawn out syllables are a phonetic representation of the words as spoken.
Page 1 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
CONTENT
Start of recording
Start of transcript 1241:49* LC
1241:53* UAL-93 1242:07* LC 1242:41* LC 1242:43* UAL-93 1243:00 UAL-93
United ninety three wind three three zero at seven runway four left cleared for takeoff. [EWR 1235-1247 LC] cleared takeoff four left United ninety three. [EWR 12351247LC] United ninety three. [EWR 1235-1247 LC] United ninety three contact departure. [EWR 1235-1247 LC] going to departure United ninety three good day. [EWR 1235-1247 LC] United ninety three fourteen hundred for twenty five hundred. [N90 1238-1256 Newark Dept.]
Page 2 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE 1243:04 E155
1243:12 UAL-93
1243:48 E155
1243:52 UAL-93
1244:34 E155
1244:38 UAL-93 1245:10 E155 1245:13 UAL-93
CONTENT
United ninety three New York departure good morning radar contact climb and maintain eight thousand and turn left heading three three zero vector for ELIOT. [N90 1238-1256 Newark Dept.] eight thousand heading three three zero for ELIOT United ninety three. [N90 1238-1256 Newark Dept.] United ninety three turn left heading uh two eight zero. [N90 1238-1256 Newark Dept.] left two eighty United ninety three. [N90 1238-1256 Newark Dept.] United ninety three dimb and maintain one zero thousand. [N90 1238-1256 Newark Dept.] climb and maintain one zero thousand ten thousand United ninety three. [N90 1238-1256 Newark Dept.] United ninety three do not exceed two five zero knots. [N90 1238-1256 Newark Dept.] not exceed two fifty United ninety three. [N90 1238-1256 Newark Dept.]
Page 3 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
1245:54 E155
1246:00 UAL-93 1246:18* UAL-93
1246:23* B43
1246:26* UAL-93 1248:03* B43 1248:07* UAL-93 1248:41* B43
CONTENT
United ninety three resume normal speed contact departure one three five point three five. [N90 12381256 Newark Dept.] one three five three five normal speed good day United ninety three. [N90 1238-1256 Newark Dept.] United ninety three is with you one zero thousand, normal speed, heading two eighty. [N90 1238-1256 Liberty West] United ninety three departure good morning, climb maintain one four thousand. [N90 1238-1256 Liberty West] climb maintain one four thousand United ninety three. [N90 1238-1256 Liberty West] United ninety three right turn heading of ah three one zero. [N90 1238-1256 Liberty West] right heading three one zero United ninety three. [N90 1238-1256 Liberty West] United ninety three climb maintain one six thousand. [N90 1238-1256 Liberty West]
Page 4 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
1248:44* UAL-93
CONTENT
climb maintain one six thousand United ninety three. [N90 1238-1256 Liberty West]
1249:31* B43
1249:35* UAL-93
United ninety three climb maintain one seven thousand go direct ELIOT on course. [N90 1238-1256 Liberty West] up to one seven thousand direct ELIOT United ninety three. [N90 1238-1256 Liberty West]
1250:37* B43
1250:41* UAL-93 1250:57* UAL-93
United ninety three contact New York center one three two point one good day. [N90 1238-1256 Liberty West] thirty two one good day United ninety three. [N90 12381256 Liberty West] and New York United ninety three with you one seven thousand. [ZNY 1245-1 258 R39]
1251:03 R39
1251:07 UAL-93
United ninety three New York center climb and maintain flight level two eight zero. [ZNY 1245-1258 R39] maintain two eight oh United ninety three. {ZNY 12451258R39]
1254:09* R39
United ninety three cleared direct DEMO. [ZNY 12451258 R39]
Page 5 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
1254:12 UAL-93 1254:53 R39
1254:59* UAL-93 1255:05* UAL-93
1255:09* R73 1257:12* R73 1257:16* UAL-93 1322:20 UAL-93
CONTENT
direct DEMO United ninety three. [ZNY 1245-1258 R39] United ninety three contact New York center one three three point four correction New York center one thirty two eighty seven. [ZNY 1245-1258 R39] one thirty two eighty seven good day United uh ninety three. [ZNY 1245-1258 R39] good morning New York United ninety three with you twenty five and a half for two eight oh. [ZNY 1250-1328 R73] United ninety three New York center good morning. [ZNY 1250-1328 R73] United ninety three climb and maintain flight level three five zero. [ZNY 1250-1328 R73] leaving two eight for three five oh United ninety three. [ZNY 1250-1328 R73] United ninety three starting to pick up some light chop at thirty five, any ride reports? [ZNY 1308-1328 RA73]
Page 6 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
1322:26 RA73
1322:37 UAL-93 1323:00 ACARS 1323:05 UAL-93
1323:14 FKL-R 1323:56 FKL-R 1324:00 UAL-93 1324:20* UAL-93
CONTENT
the ah first complained I've had and United ah ninety three, contact the Cleveland center now on one three three point zero seven. [ZNY 1308-1328 RA73] thrity three oh seven United ninety three. [ZNY 13081328RA73] BEWARE ANY COCKPIT INTROUSION. . TWO AIRCRAFT IN NY, HIT TRADE CNTER BUILDS morning Cleveland it's United ninety three with you at three five oh ah there's some light chop here at thirty five any ride reports? [ZOB 1301-1331 Franklin-R] an no just a little light chop nothing worse than that United ninety three. [ZOB 1301-1331 Franklin-R] United ninety three Cleveland one three three three seven. [ZOB 1301-1331 Franklin-R] one three three three seven good day United ninety three. [ZOB 1301-1331 Franklin-R] good morning Cleveland United ninety three is with you at three five oh intermittent light chop. [ZOB 1314-1333 Lorain-R]
Page 7 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE 1325:06* UAL-93 1325:08* LOR-R 1327:25* LOR-R
1327:30* UAL-93 1328:16* UAL-93 1328:48* UAL-93 1329:14* LOR-R 1329:20* LOR-R 1329:34* LOR-R
CONTENT
United ninety three checking in three five oh. [ZOB 1314-1333Lorain-R] United ninety three three five zero roger. [ZOB 13141333Lorain-R] United ninety three that traffic for you is one o'clock twelve miles east bound three seven zero. [ZOB 13141 333 Lorain-R] negative contact we're looking United ninety three. [ZOB 1314-1 333 Lorain-R] *** (mayday) *** (hey get out of here) ***. [ZOB 13141 333 Lorain-R] *** (get out of here) — (get out of here). [ZOB 13141333 Lorain-R] United ninety three verify three five zero. [ZOB 1 3141333 Lorain-R] United ninety three verify you're at flight level ah three five zero. [ZOB 1314-1333 Lorain-R] United ninety three verify you're level at three five zero. [ZOB 1314-1333 Lorain-R]
Page 8 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE 1329:40* LOR-R
1329:56 LOR-R
1330:03* LOR-R
1330:58* LOR-R
1331:55* UAL-93
1332:05* LOR-R
1335:36 LOR-R
1336:51 LOR-R
CONTENT
United ninety three Cleveland. [ZOB 1314-1333 LorainR] United ninety three Cleveland. [ZOB 1314-1333 LorainR] United ninety three if you hear Cleveland center ident please. [ZOB 1314-1333 Lorain-R] United ninety three Cleveland if you hear the center ident. [ZOB 1314-1333 Lorain-R] *** please sit down, keep remaining seating, we have a bomb on board, so ***. [ZOB 1314-1333 Lorain-R) er uh calling Cleveland center you're unreadable say again slowly. [ZOB 1314-1333 Lorain-R] ah United ninety three if able * ah squawk trip please. [ZOB 1333-1344 Lorain-R] [Cleveland center announces that UAL93 is turning south and east and climbing]. [ZOB 1333-1344 LorainR]
Page 9 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE 1339:10 UAL-93
1339:19 LOR-R 1339:24 LOR-R 1340:01 LOR-R 1340:12 LOR-R 1341:01 LOR-R 1341:36 LOR-R 1345:29* LOR-R
CONTENT
ah this is the captain uh would like to all remain seated there is a bomb aboard and we go back to the airport and to have our demands so please remain quiet. [ZOB 1333-1 344 Lorain-R] okay thats United ninety three calling? [ZOB 1333-1344 Lorain-R] United ninety three understand you have a bomb on board go ahead. [ZOB 1333-1344 Lorain-R] United ninety three go ahead. [ZOB 1333-1344 LorainR] United ninety three go ahead. [ZOB 1333-1344 LorainR] United ninety three do you hear Cleveland center? [ZOB 1333-1 344 Lorain-R] [Cleveland center announces loss of transponder signal from UAL93] [ZOB 1333-1344 Lorain-R] United ninety three Cleveland do you still hear the center? [ZOB 1344-1400 Lorain-R]
Page 10 of 10 INTRA-COCKPIT COMMUNICATION Time (UTC) SOURCE
CONTENT
AIRCRAFT-TO-GROUND COMMUNICATION Time (UTC) SOURCE
1345:35* LOR-R 1346:13* LOR-R 1347:28* LOR-R 1348:43 LOR-R
End of transcript
'times verified via FAA timecode reader.
CONTENT
United ninety three do you still hear Cleveland? [ZOB 1344-1400 Lorain-R] United ninety three United niner three do you hear Cleveland? [ZOB 1344-1400 Lorain-R] United ninety three United ninety three Cleveland. [ZOB 1344-1 400 Lorain-R] United ninety three United ninety three do you hear Cleveland center. [ZOB 1344-1400 Lorain-R]
1241:49
LC
1241:53
UAL-93
1242:07 1242:41 1242:43
LC LC UAL-93
1243:00
UAL-93
1243:04
E155
1243:12
UAL- 9 3
1243:48
E155
1243:52
UAL- 9 3
1244:34
E155
1244:38
UAL- 9 3
1245:10
E155
1245:13
UAL- 9 3
1245:54
E155
1246:00
UAL- 9 3
1246:18
UAL- 9 3
1246:23
B43
1246:26
UAL- 9 3
1248:03
B43
1248:07
UAL- 9 3
1248:41
B43
1248:44
UAL- 9 3
1249:31
B43
1249:35
UAL- 9 3
1250:37
B43
1250:41
UAL- 9 3
1250:57
UAL- 9 3
1251:03
R39
United ninety three wind three three zero at seven runway four left cleared for takeoff. [EWR 1235-1247 LC] cleared takeoff four left United ninety three. [EWR 1235-1247 LC] United ninety three. [EWR 1235-1247 LC] United ninety three contact departure. [EWR 1235-1247 LC] going to departure United ninety three good day. [EWR 1235-1247 LC] United ninety three fourteen hundred for twenty five hundred. [N90 1238-1256 Newark Dept.] United ninety three New York departure good morning radar contact climb and maintain eight thousand and turn left heading three three zero vector for ELIOT. [N90 1238-1256 Newark Dept.] eight thousand heading three three zero for ELIOT United ninety three. [N90 1238-1256 Newark Dept.] United ninety three turn left heading uh two eight zero. [N90 1238-1256 Newark Dept.] left two eighty United ninety three. [N90 1238-1256 Newark Dept.] United ninety three climb and maintain one zero thousand. [N90 1238-1256 Newark Dept.] climb and maintain one zero thousand ten thousand United ninety three. [N90 1238-1256 Newark Dept.] United ninety three do not exceed two five zero knots. [N90 1238-1256 Newark Dept.] not exceed two fifty United ninety three. [N90 1238-1256 Newark Dept.] United ninety three resume normal speed contact departure one three five point three five. [N90 1238-1256 Newark Dept.] one three five three five normal speed good day United ninety three. [N90 1238-1256 Newark Dept.] United ninety three is with you one zero thousand, normal speed, heading two eighty. [N90 1238-1256 Liberty West] United ninety three departure good morning, climb maintain one four thousand. [N90 1238-1256 Liberty West] climb maintain one four thousand United ninety three. [N90 1238-1256 Liberty West] United ninety three right turn heading of ah three one zero. [N90 1238-1256 Liberty West] right heading three one zero United ninety three. [N90 12381256 Liberty West] United ninety three climb maintain one six thousand. [N90 1238-1256 Liberty West] climb maintain one six thousand United ninety three. [N90 1238-1256 Liberty West] United ninety three climb maintain one seven thousand go direct ELIOT on course. [N90 1238-1256 Liberty West] up to one seven thousand direct ELIOT United ninety three. [N90 1238r1256 Liberty West] United ninety three contact New York center one three two point one good day. [N90 1238-1256 Liberty West] thirty two one good day United ninety three. [N90 1238-1256 Liberty West] and New York United ninety three with you one seven thousand. [ZNY 1245-1258 R39] United ninety three New York center climb and maintain flight level two eight zero. [ZNY 1245-1258 R39]
1251:07 1254:09 1254:12 1254:53
UAL-93 R39 UAL-93 R39
1254:59* UAL-93 1255:05
UAL-93
1255:09
R73
1257:12
R73
1257:16
UAL-93
1322:20
UAL-93
1322:26
RA73
1322:37
UAL-93
1323:00
ACARS
1323:05
UAL-93
1323:14
FKL-R
1323:56
FKL-R
1324:00
UAL-93
1324:20
UAL-93
1325:06
UAL-93
1325:08
LOR-R
1327:25
LOR-R
1327:30
UAL-93
1328:16
UAL-93
1328:48
UAL-93
1329:14
LOR-R
1329:20
LOR-R
1329:34
LOR-R
1329:40 1329:56
LOR-R LOR-R
maintain two eight oh United ninety three. [ZNY 1245-1258 R39] United ninety three cleared direct DEMO. [ZNY 1245-1258 R39] direct DEMO United ninety three. [ZNY 1245-1258 R39] United ninety three contact New York center one three three point four correction New York center one thirty two eighty seven. [ZNY 1245-1258 R39] one thirty two eighty seven good day United uh ninety three. [ZNY 1245-1258 R39] good morning New York United ninety three with you twenty five and a half for two eight oh. [ZNY 1250-1328 R73] United ninety three New York center good morning. [ZNY 12501328 R73] United ninety three climb and maintain flight level three five zero. [ZNY 1250-1328 R73] leaving two eight for three five oh United ninety three. [ZNY 1250-1328 R73] United ninety three starting to pick up some light chop at thirty five, any ride reports? [ZNY 1308-1328 RA73] the ah first complained I've had and United ah ninety three, contact the Cleveland center now on one three three point zero seven. [ZNY 1308-1328 RA73] thrity three oh seven United ninety three. [ZNY 1308-1328 RA73] BEWARE ANY COCKPIT INTROUSION. . TWO AIRCRAFT IN NY, HIT TRADE CNTER BUILDS morning Cleveland it's United ninety three with you at three five oh ah there's some light chop here at thirty five any ride reports? [ZOB 1301-1331 Franklin-R] an no just a little light chop nothing worse than that United ninety three. [ZOB 1301-1331 Franklin-R] United ninety three Cleveland one three three three seven. [ZOB 1301-1331 Franklin-R] one three three three seven good day United ninety three. [ZOB 1301-1331 Franklin-R] good morning Cleveland United ninety three is with you at three five oh intermittent light chop. [ZOB 1314-1333 Lorain-R] United ninety three checking in three five oh. [ZOB 1314-1333 Lorain-R] United ninety three three five zero roger. [ZOB 1314-1333 Lorain-R] United ninety three that traffic for you is one o'clock twelve miles east bound three seven zero. [ZOB 1314-1333 Lorain-R] negative contact we're looking United ninety three. [ZOB 13141333 Lorain-R] [ZOB 1314-1333 *** (mayday) *** (hey get out of here) *** Lorain-R] *** (get out of here) *** (get out of here). [ZOB 1314-1333 Lorain-R] United ninety three verify three five zero. [ZOB 1314-1333 Lorain-R] United ninety three verify you're at flight level ah three five zero. [ZOB 1314-1333 Lorain-R] United ninety three verify you're level at three five zero. [ZOB 1314-1333 Lorain-R] United ninety three Cleveland. [ZOB 1314-1333 Lorain-R] United ninety three Cleveland. [ZOB 1314-1333 Lorain-R]
1330:03 1330:58 1331:55 1332:05 1335:36 1336:51 1339:10
1339:19 1339:24 1340:01 1340:12 1341:01 1341:36 1345:29 1345:35 1346:13 1347:28 1348:43
LOR-R
United ninety three if you hear Cleveland center ident please. [ZOB 1314-1333 Lorain-R] LOR-R United ninety three Cleveland if you hear the center ident. [ZOB 1314-1333 Lorain-R] UAL-93 *** please sit down, keep remaining seating, we have a bomb on board, so ***. [ZOB 1314-1333 Lorain-R] LOR-R er uh calling Cleveland center you're unreadable say again slowly. [ZOB 1314-1333 Lorain-R] LOR-R ah United ninety three if able * ah squawk trip please. [ZOB 1333-1344 Lorain-R] LOR-R [Cleveland center announces that UAL93 is turning south and east and climbing]. [ZOB 1333-1344 Lorain-R] UAL-93 ah this is the captain uh would like to all remain seated there is a bomb aboard and we go back to the airport and to have our demands so please remain quiet. [ZOB 1333-1344 Lorain-R] LOR-R okay thats United ninety three calling? [ZOB 1333-1344 LorainR] LOR-R United ninety three understand you have a bomb on board go ahead. [ZOB 1333-1344 Lorain-R] LOR-R United ninety three go ahead. [ZOB 1333-1344 Lorain-R] LOR-R United ninety three go ahead. [ZOB 1333-1344 Lorain-R] LOR-R United ninety three do you hear Cleveland center? [ZOB 13331344 Lorain-R] LOR-R [Cleveland center announces loss of transponder signal from UAL93] [ZOB 1333-1344 Lorain-R] LOR-R United ninety three Cleveland do you still hear the center? [ZOB 1344-1400 Lorain-R] LOR-R United ninety three do you still hear Cleveland? [ZOB 13441400 Lorain-R] LOR-R United ninety three United niner three do you hear Cleveland? [ZOB 1344-1400 Lorain-R] LOR-R United ninety three United ninety three Cleveland. [ZOB 13441400 Lorain-R] LOR-R United ninety three United ninety three do you hear Cleveland center. [ZOB 1344-1400 Lorain-R]
United Airlines Flight 93 - Flight Profile
OFFICIAL USE ONLY
The following profile of United Airlines Flight 93 is based on data from the flight data recorder (FDR) recovered from the crash site, as well as radar data obtained from the Federal Aviation Administration's Air Route Traffic Control Centers and the U.S. Air Force 84th Radar Evaluation Squadron. Figure 1 shows the flight path of the aircraft from take off at Newark, NJ to the crash site near Johnstown, PA. Figure 2 shows the aircraft's altitude profile for the 1 hour and 21 minute duration of the flight. United flight 93 departed Newark, NJ at 8:42 am (point A in Figures 1 and 2) and reached its assigned cruising altitude of 35,000 feet at about 9:02 am (B). The flight appears normal until a brief descent of about 600 feet starting at 9:28 (C). The words "get out of here" and sounds of a struggle were recorded on the air traffic control radio at FAA's Cleveland Center facility at this time. The Cockpit Voice Recorder (CVR) onboard the airplane began providing sounds from the cockpit at approximately 9:32. At 9:34 (D) the airplane starts to climb from 35,000 feet, and shortly thereafter begins a left turn to the southeast. The airplane maintained a maximum altitude of 41,000 feet for about 2 minutes and then started descending at about 9:39 (E). Radar stations stopped receiving transponder returns fromUAL93 at approximately 9:41. There was a brief interruption in the descent at 9:46 (F) as the airplane climbed from 19,000 feet to 20,500 feet before resuming its descent. At about 9:57 the airplane started a left turn to the east. Just before 9:59 (G) the airplane was at 5,000 feet when about 2 minutes of rapid, full left and right control wheel inputs resulted in multiple 30 degree rolls to the left and right. From approximately 10:00 to 10:02 (H) there were four distinct control column inputs that caused the airplane to pitch nose-up (climb) and nose-down (dive) aggressively. During this time the airplane climbed to about 10,000 feet while turning to the right. The airplane then pitched nose-down and rolled to the right in response to flight control inputs, and impacted the ground at about 490 knots (563 mph) in a 40 degree nose-down, inverted attitude. The time of impact was 10:03:11.
Figure 1. UA-93 Radar Ground Track A - UAL 93 takes off from Newark, NJ at 0842 EDT. B - UAL 93 levels off at assigned altitude of 35,000 ft. C - 600 foot deviation from assigned altitude. D - Starts climb to 41,000 feet, then turns towards Southeast. E - At max altitude of 41,000 feet; xponder returns cease 2 min. later. F - Brief interruption in descent. G - Evidence of struggle on CVR; aircraft starts climbing. H - Aircraft noses down and starts rapid descent. I - Aircraft aircraft impacts the ground inverted and at high speed.
Q
C
LI 010:03:11 AM
Figure 2. UA-93 Altitude Profile 45000
1 I rI j-~i
_!_.-, !
L.
.L..LJ. 40000 i_
35000
-t30000
"11
25000 0) TJ
20000
I
15000 - U A L 93 takes off from Newark, NJ at 0842 EOT. - UAL 93 levels off at assigned altitude of 35,000 ft. - 600 foot deviation from assigned altitude. - Starts climb to 41,000 feet, then turns towards Southeast. - At max altitude of 41,000 feet; xponder returns cease 2 min. later. - Brief interruption in descent. - Evidence of struggle on CVR; aircraft starts climbing. - Aircraft noses down and starts rapid descent. Aircraft aircraft impacts the ground inverted and at high speed.
10000
5000
I
:30:00
08:40:
08:50:00
I
_|Jl_4..._.
..L.
I
09:00:00 09:10:00 09:20:00 09:30:00 09:40:00 09:50: Eastern Daylight Time, HH/ SS (= UTC - 4 Hours)
10:00:00
10:10:00
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