T7 B3 Cvr Notes- Ntsb Fdr- 1 Pg Summary- Ua 93 Points Of Interest 313

UA 93 Points of Interest 0842 EOT - takeoff 0902 EOT - levels off at 35K feet altitude 0923 EDT - ACARS message "BEWARE ANY COCKPIT INTRUSION...TWO AIRCRAFT IN NY, HIT TRADE CNTR BUILDS" 0927:30 EDT - last normal response from UA 93 crew to ATC 0928 EDT - hijack per crew ATC transmission "mayday...hey get out of here" & FDR evidence 0931:55 EDT - "sit down...we have bomb" communication, presumably intended for passengers, transmitted over VHF1 to ATC 0934 EDT - NAV mode changes from VNAV/LNAV/MACH modes to MCP-driven vertical speed, heading, altitude, and airspeed modes 0934 EDT - airplane starts climb on vertical speed mode to 40+K feet altitude 0935 EDT - airplane starts left turn to 120 degrees back towards DCA 0939:10 EDT - "ah this is the captain...remain seated there is a bomb aboard and we go back to the airport and to have our demands so please remain quiet" communication, presumably intended for passengers, transmitted over VHF1 to ATC 0940 EDT - airplane starts descent in MCP vertical speed mode at about 4,200 feet per minute in MCP vertical speed window 0941 EDT - transponder off 0945:40 EDT - brief level off at 20K feet altitude via MCP vertical speed reset to 0 ft/min while still in vertical speed mode, followed immediately by change to 1,300 ft/min vertical speed, still in vertical speed mode 0957:30 EDT - start of severe roll oscillations and MCP selected heading changes to 90 degrees 0958:30 EDT - airplane levels off at 5K feet altitude via MCP altitude hold mode with severe control oscillations still occurring 1003 EDT - impact with ground Note: Developed by| [prior to CVR/Animation playback session via NTSB FDR, ATC, RADAR, and NAV System Study data. CVR/Animation session and Commission input may result in additional points of interest.

9/11 Working-level Employee