Apollo Glossary

Controlled Television Assembly Manual. An AGC output meter is located on the LCRU. A AGS One of four Omni Directional Control Antennas, known as Omni Alpha Abort Guidance System ACA ALHT Attitude Control Assembly Apollo Lunar Hand Tools ACQ ALM Acquisition Alarm AGC (1) ALSCCApollo Guidance Computer AGC (2) Automatic Gain Control, which is part of the TV system flown on Apollos 15-17, see Ground

Apollo Lunar Surface Close-Up Camera, also known as the Gold Camera after its developer, astronomer Tommy Gold ALSD Apollo Lunar Surface Drill; flown on Apollo 15, 16, and 17 ALSE Apollo Lunar Sounder Experiment ALSEP Apollo Lunar Surface Experiments Package; collection of experiments flown to the lunar surface by Apollo 12, 14, 15, 16, and 17; see ASE, CCG, CPLEE, HFE, LACE, LDD, LSG, LSM, LSP, PSE, SIDE, and SWS ALSRC Apollo Lunar Sample Return Container ALT Altimeter ALIGN Alignment or Altitude or Alternate AM Ammeter or Amplitude Modulation AMP Ampere or Amplifier AMP-HR Ampere Hour ANNUN-NUM Annunciator/Numerics ANT Antenna AOS Acquisition Of Signal or Acquisition Of Site

AOT Alignment Optical Telescope, which is basically just a sighting scope, with no magnification and a 60-degree field-of-view. The AOT is ceiling-mounted above the forward instrument panels and can be seen in Apollo 12 training photo KSC-69PC-0594. There are six fixed viewing directions (the "detents"). The astronauts looked through the AOT and, using two sets of marks called the spiral and cursor, measured star locations so that the computer can determine LM orientation. A discussion of the AOT has been assembled by Journal Contributor Adam Bootle. AP Alpha Particle (spectrometer) APS Auxiliary Propulsion System (S-IVB) or Ascent Propulsion System (LM) AR Relay Mode, Communications Mode of the Space Suit Communicator ARIA Apollo Range Instrumentation Aircraft ARM Armed ARS Atmosphere Revitalization System ASA Abort Sensor Assembly ASAP As Soon As Possible ASC Ascent ASE Active Seismic Experiment; part of the ALSEP instrumentation flown on Apollo 14 and 16 ASP Apollo Simple Penetrometer; flown on Apollo 14

ASR Area Surveillance Radar ASSY Assembly ATCA Attitude & Translation Control Assembly ATT Attitude AUTO Automatic AUX Auxiliary AVAIL Available Average G Provides a measure of spacecraft average over a finite period of time AZ Azimuth

B One of Four Omni Directional Control Antennas, known as Omni Bravo BAT or BATT Battery BB A BB is a shot pellet 0.175 inch ( 0.44 cm) in diameter, usually used in an air rifle. BCN Beacon

BEF Blunt End Forward BIP Bipropellant BMAG Body-Mounted Attitude Gyro BP Barber Pole BPS Bits Per Second or Bits Per Sample BRA Bag Restraint Assembly. "BRA" is probably an after-the-fact, made-up acronym. It was a mesh bag with two compartments that was used to keep the helmets out of the way during in-cabin operations. The name undoubtedly comes from its resemblance to a brassiere. BSLSS Buddy Secondary Life-Support System, a set of hoses and connectors which allowed the astronauts to share cooling water in the event that one of the PLSSs failed BTH Both BTU British Thermal Unit BUSS Biomedical Urine Sampling System

C One of Four Omni Directional Control Antennas, known as Omni Charlie CAB Cabin

CAL Calibrate or Calibration CALC Calculate or Calculated CAPCOM Spacecraft Communicator CB Circuit Breaker C-BND C-Band CBL Cable CC Contact Closure CCFF or C Squared-F Squared Crew Compartment Fit and Function CCIG Cold Cathode Ion Gauge experiment; was part of the ALSEP instrumentation flown on Apollo 12, 14, and 15 CDR Commander CDH Constant Delta Height CDU Coupling Data Unit CES Control Electronics Section; controls LM attitude and translation about all three axis CG

Center of Gravity CHAR Character CIR Circuit or Circuit Breaker CIRC Circularization CL Close CLSD Closed CM Command Module CMC Command Module Computer CMD Command CMDED Commanded CMP Command Module Pilot CNTL Control CO2 Carbon Dioxide COAS Crewman Optical Alignment Sight. Discussion.

COMM Communications COMP Compare or Component COND Condition, Conditioning or Conditioner Config Configuration CONT Continue COOL Coolant CP Command Pilot or Control Point CPLEE Charged Particle Lunar Environment Experiment; part of the ALSEP instrumentation flown on Apollo 14 CPS Cycles Per Second CRD Cosmic Ray Detector; flown on Apollo 16 and 17 Cross-pointer or X-Pointer Article. See, also, the Apollo 15 discussion following 104:41:54. CRSFD Crossfeed CRT Cathode-Ray-Tube CRYO

Cryogenic CSC Close-up Stereo Camera or Contingency Sample Collection CSI Coelliptic Sequence Initiation CSM Command and Service Module CSRC Contingency Sample Return Container CTG Cartridge CTV Color Television CUR Current CWEA Caution and Warning Electronics Assembly CWG Constant Wear Garment, the Long-Johns D Downward Thrusting RCS Engine or One of Four Omni Directional Control Antennas, known as Omni Delta DAC Digital to Analog Converter or Data Acquisition Camera DAP Digital Autopilot DB Decibel

DC Direct Current DCA Digital Command Assembly DECA Descent Engine Control Assembly DECR Decrease DEDA Data Entry and Display Assembly DEG Degree Delta H Height Difference Delta P Pressure Difference Delta T Time Difference Delta V Change in Velocity DESC Descent DET Detent or Detector or Digital Event Timer DF Direction Finding DFI Development Flight Instrumentation

DIFF Difference or Differential DIG Digital DIR Direct DISCH Discharge DISP Display DIV Diverter Dixie Cup This nickname refers to the cup-shaped, individual sample bags that were used on Apollo 12, 14, and 17. The nickname derives from a brand of wax-coated, paper drinking cups which, like such brands as Kleenex and Xerox, became a generic name because of widespread popularity. The following is a brief history. The first disposable, individual drinking cups were developed by Lawrence Luellen in 1907-8 and, in the next decade, gained market acceptance due to increasing concerns about disease spread by use of common-use dippers and glasses. The company was later headed by Hugh Moore and, in 1919, the cup, which had been known as the Health Cup, acquired the Dixie Cup brand-name and national prominence as a result of the Influenza Epidemic that struck after World War I. DLAY Delay DOI Descent Orbit Insertion DPLY Deploy or Deployed DPS Descent Propulsion System

DR Dead Reckoning or Descent Rate DRT Dome Removal Tool DSE Data Storage Equipment DSEA Data Storage Electronics Assembly DSKY Display and Keyboard Assembly (LM photo and diagram) DSN Deep Space Network

EASEP Early Apollo Surface Experiment Package; collection of experiments flown on Apollo 11; see ASE and LRRR ECA Electrical Control Assembly ECOM Electronics Communications ECS Environmental Control System ED Explosive Device EDS Emergency Detection System E-DUMP Erasable-Memory Download from Spacecraft; also known as E-MOD

ELS Earth Landing System EMI Electromagnetic Interference E-MOD Erasable-Memory Download from Spacecraft; also known as E-DUMP EMU Extravehicular Mobility Unit; Space Suit and Backpack combination EPS Electrical Power System ETB Equipment Transfer Bag EV Extravehicular EVA Extravehicular Activity EVCS Extravehicular Communications Systems

F Fahrenheit or Forward Thrusting RCS Engine FAIL Failure FAM Familiarization FDAI Flight Director Attitude Indicator

FDO or FIDO Flight Dynamics Officer Fiducial The various Hasselblad cameras had a plate next to the film that superimposed references marks (reseau crosses) on the film. In the text, the location of an object in an image is sometimes indicated by reference to the reseau crosses=fiducials. Details linked here. Filling a Square Charlie Duke provided the following explanation at 148:06:03 Duke - "Well, in the military, you have a set of requirements you've got to do to, like, stay current in an airplane. You need so many landings, you need so many approaches, you need so many whatevers. So they have a matrix, you know; and across the top you have columns and the horizontal axis it might be the dates or something like that. And when you get one, you filled the square; you'd make a check mark and that was called 'filling the square'." FITH Fire In The Hole FL Flag FM Frequency Modulation FP Flight Progress FRAG Fragment FREQ Frequency FTT Fuel Transfer Tool FUS Far-Ultraviolet Spectrometer FWD

Forward

GASC Gas Analysis Sample Container GASTA Gimbal Angle Sequencing Transformation Assembly G&C Guidance and Control GCA Ground Controlled Approach GCTA Ground-Command Television Assembly GDA Gimbal Drive Actuator GDC Gyro Display Coupler GDO Guidance Dynamics Officer GET Ground-Elapsed Time GETI Ground-Elapsed Time of Ignition GLY Glycol GMBL Gimbal G&N

Guidance and Navigation GNCS Guidance, Navigation and Control System GND Ground Gnomon Tool consists of a weighted staff suspended on a two-ring gimbal and supported by a tripod. The staff extends 12 inches above the gimbal and is painted with a gray scale. The gnomon is used as a photographic reference to indicate local vertical, sun angle, and scale GOX Gaseous Oxygen GROVER Geological Rover; an alternate name for the 1-g training version of the Lunar Roving Vehicle (LRV) GUID Guidance

H Height (altitude) Handover "'Handover' basically means handover from one ground station to another of 'uplink' voice, command and ranging. 'Downlink' signals can be taken from any station in view and configured, regardless of uplink. And, of course, telemetry, voice, and TV could all be selected from different sites. Also bear in mind that there could be three uplinks - CSM, LM and EASEP/ALSEP. The 9m stations (CRO, HAW, GWM on this longitude) were generally used for the EASEP/ALSEP support." (Mike Dinn, Deputy Director of the Honeysuckle Tracking Station during Apollo) HBLAD Hasselblad Camera HBR High Bit Rate

HCEX Highspeed Color Ektachrome Film H-Dot Time derivative of height (altitude); Descent Rate or Ascent Rate HE Helium HEDC Hasselblad Electric (Electronic?) Data Camera HFE Heat Flow Experiment or Heat Flow Electronics; part of the ALSEP instrumentation flown on Apollo 15, 16, and 17 HGA High Gain Antenna H/H Altitude or Altitude Rate HI High HL High Level HLD Hold H2O Water HSD High-Speed Data HTC Hand-Tool Carrier HV

High Voltage HVR Hover H/X Heat Exchanger

IAU International Astronomical Union ICS Intercommunications System ID Identification IFR Instrument Flight Rules IG Inner Gimbal IGA Inner Gimbal Angle IGN Ignition ILS Instrument Landing System IMU Inertial Measurement Unit IN Inlet INCO

Instrumentation and Communications Officer INCR Increase INJ Injector INST Instrumentation INTEG Integrity INVTR Inverter IP Initial Point IPI Integrated Position Indicator IRIG Inertial Rate Integrating Gyro ISA Interim Stowage Assembly. As indicated in the diagram, the ISA is a set of stowage bags on a framework that fits over the Commander's PLSS when the latter is mounted on the wall behind the CDR's left shoulder. An ISA can be seen on the left at Neil Armstrong's back in Apollo 11 training photo KSC-69PC-319. When the PLSS is in use, the ISA is put somewhere out of the way and, for the return to lunar orbit, it is attached to the aft bulkhead. Journal Contributor David Woods notes that after rendezvous with the Command Module, the ISA is transferred over, probably without the framework, for return to Earth. ISOL Isolation ISR Infrared Scanning Radiometer

ISS Inertial Sensor System or Interim Stowage Shelf IU Instrument Unit IV Intravehicular IVA Intravehicular Activity

JETT Jettison JD Jet Driver JPL Jet Propulsion Laboratory

K-bird KC-135 aircraft K factor Related to LM targeting along the descent path. Starting with Apollo as updated during descent from terrestrial tracking data to improve accuracy KSC Kennedy Space Center

L&A Landing and Ascent facility; which consisted of a plaster-of-paris site model mounted upside down over a moveable TV camera. The TV picture was then fed to displays in the windows of the LM simulator.

LACE Lunar Atmospheric Composition Experiment; part of the ALSEP instrumentation flown on Apollo 17 LAD Lunar Atmosphere Detector LAM Landing Area Map (???) LAT Latitude or Lateral LBR Low Bit Rate LCG Liquid-Cooled Garment LCRU Lunar Communications Relay Unit LDD Lunar Dust Detector; part of the ALSEP instrumentation flown on Apollo 12, 14, and 15 LDG Landing LEAM Lunar Ejecta And Meteorite (experiment); part of the ALSEP instrumentation flown on Apollo 17 LEB Lower Equipment Bay LEC Lunar Equipment Conveyor - drawing courtesy of Karl Dodenhoff. The LEC attachment point in the cabin overhead is the yellow bar in Apollo 15 photo S71-40773, courtesy Gary Kitmacher, John Duncan, and Gary Neff. LEVA Lunar Extravehicular Visor Assembly; a polycarbonate shell and two visors with thermal control

and optical coatings on them. Details and diagrams are linked here. LGC Lunar Module Guidance Computer LHSSC Left-Hand Side Stowage Compartment LIM Limit or Limits LiOH Lithium Hydroxide LLTV Lunar Landing Training Vehicle. See the discussion at 113:43:49 in the Apollo 17 Journal. John Osborn has provided an extensive set of photographs of the one LLTV that survived to the end of the Apollo program. LM Lunar Module LMP LM Mission Programmer or Lunar Module Pilot LMS Lunar Mass Spectrometer or Lunar Module Simulator LNP Lunar Neutron Probe (experiment); flown on Apollo 17 LO Low LOI Lunar Orbit Insertion LONG Longitude LOPC

Lunar Orbit Plane Change LOS Loss Of Signal or Loss Of Site LPD Landing Point Designator. The Commander can look through a set of scribe marks on his window and the LPD angle, which LMP gives him from the PGNS, will tell him where to look along the vertical scale to find the place where the computer thinks they are going to land. If the CDR doesn't like the spot, he can move his handcontroller to tell the computer that he wants to change the landing spot up or back or to either side. A single movement of the handcontroller, which moves the landing point by a half degree or so, is usually referred to by the astronauts as a "click". Journal Contributor Randy Attwood has provided views of the scribe marks from the interior of LM-9 and from the exterior. Note that there are scribe marks on both the innermost window surface and on the outermost. The CDR positions himself so that the two sets of marks are lined up.] LPI Lunar and Planetary Institute LPM Lunar Portable Magnetometer; flown on Apollo 14 and 16 LR Landing Radar LRL Lunar Receiving Laboratory LRRR, LR Cubed, or LR3 Lunar Ranging Retro-Reflector; flown on Apollo 11, 14, and 15. Further information can be found at the McDonald Observatory Website http://almagest.as.utexas.edu/~rlr/mlrs.html LRV Lunar Roving Vehicle; flown on Apollo 15, 16, and 17 LSB Least Significant Bit LSCRE Lunar Surface Cosmic Ray Experiment

LSG Lunar Surface Gravimeter; part of the ALSEP instrumentation flown on Apollo 17 LSM Lunar Surface Magnetometer; part of the ALSEP instrumentation flown on Apollo 12, 15, and 16 LSPE Lunar Seismic Profiling Experiment; part of the ALSEP instrumentation flown on Apollo 17 LSUC Lunar Surface Ultraviolet Camera; flown on Apollo 16 LTC Lunar Topographic Camera LTG Lunar Traverse Gravimeter (experiment); flown on Apollo 17 LV Low Voltage LVL Level

MA Master Alarm Mafic Minerals Mafic minerals are rich in magnesium and iron and are usually dark colored. MAG Magazine MAL Malfunction MAN Manual or Manifold

MAP Message Acceptance Pulse MAX Maximum MCC Mission Control Center or MidCourse Correction MCCH Mission Control Center Houston MDC Main Display Console (CM) MESA Modular Equipment Stowage Assembly MET Mission Elapsed Time, Mission Event Timer, or Mobile Equipment Transporter. The Apollo 14 transporter was a two-wheeled rickshaw vehicle used to carry tools, containers, spare film, etc. MFC Main Feeder Contactor MG Middle Gimbal MGA Middle Gimbal Angle MIN Minimum Minus Y axis South side of the LM Minus Z axis East side of the LM MOCR

Mission Operations Control Room M/P Mortar Pack MPA Mortar Pack Assembly MPX Multiplex MSB Most Significant Bit MSC Manned Spacecraft Center; now Johnson Space Center MSFN Manned Space Flight Network (pronounced "Miss Finn"); provides reliable, (usually) continuous, and instantaneous with the astronauts, launch vehicle, and spacecraft from lift-off to splashdown MSOB Manned Spacecraft Operations Building at the Kennedy Space Center. The training area that the astronauts used to practice the mechanics of ALSEP deployments and other EVA activities was located behind the MSOB. Other training activities, such as those involving a LM mock-up, were conducted in the building. MSSC Magnetic Shield Sample Container MTR Meter MTVC Manual Thrust Vector Control

N204 Nitrogen Tetroxide, oxidizer used in the DPS and APS

N/A Not Applicable NASA National Aeronautics and Space Administration NAV Navigation NB Narrow Band NORM Normal NTS Nevada Test Site

O2 Oxygen OB OnBoard OCS Organic Control Sample OG Outer Gimbal OGA Outer Gimbal Angel OPN Open OPR Operate

OPS Oxygen Purge System ORDEAL Orbital Rate Display Earth And Lunar; displays the computed local vertical in the pitch axis during Earth or Lunar orbit OUT Outlet or Output OVR Over OVRD Override OX Oxidizer or Oxygen

P00 Program Zero-Zero, pronounced "pooh"; see a description of P00 provided by Frank O'Brien. P22 P22 is the LM computer program that uses the rendezvous radar to track the Command Module. Parker Valves These propellant isolation valves were made by a U.S. unit of Parker Hannifin PLC and were part of the RCS propellant feed system and the valve switches were cycled open and closed by the LMPs immediately after landing, just in case something had gotten jarred. The control switches were located on the main LMP switch panel. Each of the four clusters of RCS jets was connected to two RCS systems and, consequently, there were eight switches, two for each RCS quad. Each switch had an Open and Close position. PA Power Amplifier PAD Preliminary Advisory Data: the crew had pre-printed forms on which they could write lift-off times and other data they would need in the event that communications was lost with Houston. Before and after each rest period, the CapCom would read up a list of lift-off times covering the

next 10 to 12 hours and, prior to launch, a longer list of data was read up. PAO Public Affairs Office PART Partial PCA Program Coupler Assembly PCM Pulse Code Modulation PCT Per Cent PDI Powered Descent Initiation PFS Per Cent Full Scale PGA Pressure Garment Assembly PGNCS Primary Guidance, Navigation, and Control System PGNS Primary Guidance and Navigation System (pronounced "pings") PI Principal Investigator PIA Pre-Installation Acceptance PIPA Pulsed Integrating Pendulous Accelerometer

PLSD Pulsed PLSS Portable Life Support System Plus Y axis North side of the LM Plus Z axis West side of the LM PM Phase Modulation PM1/NB Phase Modulator 1??/Narrowband PM1/WB, see the LCRU documentation Phase Modulator 1??/Wideband PNLS Panels PO Power Output POS Position PPK Personal Preference Kits PQMD Propellant Quantity Measuring Device PRA Program Reader Assembly PRD Personal Radiation Dosimeter

PRELIM Preliminary PRESS Pressure PRIM Primary PRO Proceed PROG Program PROP Propellant or Propulsion PSE(P) Passive Seismic Experiment (Package); part of the ALSEP instrumentation flown on Apollo 11, 12, 14, 15, and 16 PSIA Pounds Per Square Inch Absolute PSID Pounds Per Square Inch Differential PTA Pulsed Torque Assembly PTC Passive Thermal Control; also known as the Barbecue mode, in which the LM/CSM stack was oriented with its long axis perpendicular to the Sun so that, when the spacecraft were put into a slow rotation around that axis, heating and cooling would be relatively uniform. PTT Push-To-Talk PVR Percent Voltage Reference

PWM Pulse Width Modulation PWR Power PYRO Pyrotechnic

QD Quick Disconnect QTY Quantity QUAD Quadrant

R (Computer) Register R-Dot Rate of Change in range; rate of approach RAD Radiation Range Rate Change in range per unit time. In the case of a Rover traverse, if the driver is moving in a straight line away from the last Rover Nav initialization point, then the range rate is identical to the average speed. If, however, the driver has been making turns to avoid craters, then the range rate will be lower than the average speed. RC/OC Reverse Current/OverCurrent RCS

Reaction Control System RCU Remote Control Unit RCVR Receiver REACQ Re-acquire REC Recorder RECD Received REF Reference REFSMMAT Reference Stable Member Matrix or, sometimes, Reference to Stable Member Matrix. See Charlie Duke's definition at 104:47:55 REG Regulator REL Release Reseau Plate A glass plate fitted close to the film plane in the lunar surface Hasselblads. Details linked here. RET Retract or Return REV Reverse RF Radio Frequency

RFLT Reflect or Reflected RGA Rate Gyro Assembly RLS Radius of Landing Site or Reference Landing Site RLY Relay RNG Range or Ranging ROD Rate of Descent RR Rendezvous Radar. The Rendezvous Radar was mounted on the top of the LM. The radar dish on LM-9, originally scheduled to be flown on Apollo 15 when that was an H mission, is shown in a photo by Randy Attwood. RS Remote Site RSVR Resolver RTG Radioisotopic Thermoelectric Generator; used to provide power to the ALSEP experiments flown on Apollo 12, 14, 15, 16, and 17; also see SNAP-27 RTV Room Temperature Vulcanizing silicone rubber insulation which was used, for example, on the handles of the Apollo geology hammers and on the tips of the fingers of the EVA gloves. RUPT Rupture

S Sideward Thrusting RCS Engine SAS Space Adaptation Syndrome S-BND S-Band There were two S-band, high-gain antennas used by the LM crew. One was mounted on the top of the spacecraft, as can be seen in close-up in a LM-9 photo by Randy Attwood. The other was a large, umbrella-like antenna erected on the surface by the Apollo 12 and 14 crews. The Apollo 12 antenna can be seen on the righthand side of AS12-47- 6988 SBT S-Band Transponder S/C Spacecraft SCB Sample Collection Bag SCE Signal-Conditioning Equipment SCS Stabilization and Control System SE Systems Engineer SEB Scientific Equipment Bay SEC Secondary, Second, or Special Environmental Container; the container when sealed will retain a high vacuum for study of lunar samples in its original environment SECS Sequential Events Control System

SEF Sharp End Forward SEL Select SENS Sensitivity SEP Separation, Separator, or Surface Electric Properties (experiment). The SEP experiment was flown on Apollo 17 SEQ Sequence or Scientific Equipment Bay SESC Special Environmental Sample Container SET Set or Setting SHE SuperCritical Helium SIDE Suprathermal Ion Detection Experiment; part of the ALSEP instrumentation flown on Apollo 12, 14, and 15 SIG Signal SIM Scientific Instrument Module or Simulation SLA Spacecraft Launch Adapter or SM/LM Adapter SM Service Module

SME Soil Mechanics Experiment SNAP-27 System for Nuclear Auxiliary Power, Model 27 S/O Shut Off SOL Solenoid SOV Shut Off Valve SP Spare SPEC Specification SPS Service Propulsion System SRC Sample Return Container; the rock boxes SRP Self-Recording Penetrometer; flown on Apollo 15 and 16 S/S Samples per Second SSC SpaceSuit Communicator SSD Sun Shadow Device SSR Staff Support Room

ST Static STGE Stage STBY Standby STR Strength STRB Strobe SUP Supply SUSP Suspension SVO Servo SW Switch SWC Solar Wind Composition Collector; flown on Apollo 11, 12, 14, 15, and 16 SWIP Super Weight Improvement Program SWS Solar Wind Spectrometer; part of the ALSEP instrumentation flown on Apollo 12 and 15 SYNCH Synchronization SYS System

TB TalkBack TCA Thrust Chamber Assembly TCP Thrust Chamber Pressure TCU Television Control Unit TDS Thermal Degradation Sample; flown on Apollo 14 TEC Transearth Coast TEI Transearth Injection TELEMU Telemetry TEMP Temperature Tephem Time of Ephemeris T/G Thumper/Geophone Experiment TGE Traverse Gravimeter Experiment; flown on Apollo 17 THROT Throttle

TIG or Tig Time of Ignition TJM Tower Jettison Motor TK Tank TLC Translunar Coast TLI Translunar Injection TLM or TM Telemetry TOL Tolerance TPI Terminal Phase Initiation TR Transmit/Receive TRANS Translation Travono (possibly Travano) A gray-brown plastic used in the LM to protect surfaces where metal could not be used. See Jim Irwin's discussion at 121:19:30. Also mentioned by John Young in a portion of the Apollo 16 Technical Debrief quoted after 106:48:11. TRUN Trunnion TSB Temporary Stowage Bag

TTCA Thrust/Translation Controller Assembly TTHR Tether TTY Teletype or Teletypewriter TVC Thrust Vector Control

U Upward Thrusting RCS Engine UCTA Urine Collection and Transfer Assembly UDMX Unsymmetrical-Dimethylhydrazine, part of the fuel for the DPS and APS UHF Ultra-High Frequency UHT Universal Handling Tool UVC Ultraviolet Camera; flown on Apollo 16

V Volt V sub I Inertial Velocity VAC

Volts Alternating Current VAR Variable VDC Volts Direct Current VEL Velocity VHF Very High Frequency VLV(S) Valve(s) VOX Voice Activated Transmission VPI Valve Position Indicator VR Vector Ranging VRMS Volt Root Mean Square

W Watt WB WideBand W/B Water Boiler WILCO

Will Comply

X Cross X Axis Vertical Axis XMTR Transmitter X-Pointer See Crosspointer XPNDR Transponder

Y Axis Left to Right Axis

Z Axis Fore/Aft Axis Z Bag Storage Bag stored at the minus Z Bulkhead