Apollo acronyms

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Apollo era acronyms

Acronym Meaning
A One of four Omni Directional Control Antennas, known as Omni Alpha
AAP Apollo Applications Program
ACA Attitude Control Assembly
ACBWG Apollo Reentry Communications Blackout Working Group
ACE acceptance checkout equipment; also automatic checkout equipment
ACED AC Electronics Division, General Motors Corporation
ACQ Acquisition
ACRIM Active Cavity Radiometer Irradiance Monitor
ADEOS Advanced Earth Orbiting Satellite (Japan)
AEAP Atmospheric Effects of Aviation Program
AEC Atomic Energy Commission
AEDC Arnold Engineering Development Center, Air Force
AES Apollo Extension System, forerunner of Apollo Applications Program
AFETR Air Force Eastern Test Range
AFRM airframe
AFSC Air Force Systems Command
AGAGE Advanced Global Atmospheric Gases Experiment
AGC Automatic Ground Control
AGS Abort Guidance System
AIRS Atmospheric Infrared Sounder
ALEP Apollo lunar exploration program
ALHT Apollo Lunar Hand Tools
ALIGN Alignment or Altitude or Alternate
ALM Alarm
ALSCC Apollo Lunar Surface Close-Up Camera, also known as the Gold Camera
ALSD Apollo Lunar Surface Drill; flown on Apollo 15, 16, and 17
ALSD Apollo lunar surface drill
ALSE Apollo Lunar Sounder Experiment
ALSEP Apollo Lunar Surface Experiments Package
ALSRC Apollo Lunar Surface Return Container
ALT Altimeter
AM Ammeter or Amplitude Modulation
AMP Ampere or Amplifier
AMP-HR Ampere Hour
AMR Altimetry Microwave Radiometer
AMS Apollo mission simulator
AMSU Advanced Microwave Sounding Unit
ANNUN-NUM Annunciator/Numerics
ANT Antenna
AOH Apollo operations handbook
AOS Acquisition Of Signal or Acquisition Of Site
AOT Alignment Optical Telescope
AP Alpha Particle (spectrometer)
AP Associated Press
APS Auxiliary Propulsion System (S-IVB) or Ascent Propulsion System (LM)
AR Relay Mode, Communications Mode of the Space Suit Communicator
ARC Ames Research Center (Moffet Field, CA)
ARIA Apollo Range Instrumentation Aircraft
ARM Armed
ARS Atmosphere Revitalization System
AS Apollo-Saturn
ASA Abort Sensor Assembly
ASAP As Soon As Possible
ASC Ascent
ASE Active Seismic Experiment
ASP Apollo Simple Penetrometer
ASPO Apollo Spacecraft Program Office, MSC
ASR Area Surveillance Radar
ASSB Apollo Site Selection Board
ASSY Assembly
ASTER Advanced Spaceborne Thermal Emission and Reflection Radiometer
ASTT Apollo Special Task Team
ATCA Attitude & Translation Control Assembly
ATM Apollo telescope mount
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
BAC Bell Aerospace Company or, before January 1970, Bell Aerosystems Company
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
BeV billion electron volts
BIG biological isolation garment
BIP Bipropellant
BMAG Body-Mounted Attitude Gyro
BP Barber Pole
BP Boilerplate
BPS Bits Per Second or Bits Per Sample
BRA Bag Restraint Assembly
BSD Board on Sustainable Development
BSLSS Buddy Secondary Life-Support System
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
CARIDS customer acceptance review item dispositions
CARR Customer Acceptance Readiness Review
CASE Coordinated Aerospace Supplier Evaluation
CB Circuit Breaker
CBL Cable
C-BND C-Band
CC Contact Closure
cc cubic centimeter(s)
CCB Configuration Control Board
CCFF or C Squared-F Squared Crew Compartment Fit and Function
CCIG Cold Cathode Ion Gauge experiment
CDH Constant Delta Height
CDR Commander
CDU Coupling Data Unit
CERES Clouds and the Earth's Radient Energy System
CES Control Electronics Section
CG Center of Gravity
CGCR Committee on Global Change Research
CHAR Character
CIESIN Consortium for International Earth Science Information Network
CIR Circuit or Circuit Breaker
CIRC Circularization
CL Close
CLIVAR Climate Variability (WCRP program)
CLSD Closed
CM Command Module
cm centimeter(s)
cm centimeter, centimeters
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
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
cps cycles per second (see Hz)
CRD Cosmic Ray Detector; flown on Apollo 16 and 17
CRSFD Crossfeed
CRT Cathode-Ray-Tube
CRYO Cryogenic
CSC Close-up Stereo Camera or Contingency Sample Collection
CSI Coeliptic Sequence Initiation
CSM Command and Service Module
CSRC Contingency Sample Return Container
CTG Cartridge
CTV Color Television
cu m cubic meter, cubic meters
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
DAAC Distributed Active Archive Center
DAC Digital to Analog Converter or Data Acquisition Camera
DAP Digital Autopilot
DB Decibel
DC Direct Current
DCA Digital Command Assembly
DCR Design Certification Review
DECA Descent Engine Control Assembly
DECR Decrease
DEDA Data Entry and Display Assembly
DEG Degree
degrees C degrees Celsius (centigrade)
degrees F degrees Fahrenheit
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 individual sample bags that were used on Apollo 12, 14, and 17.
DLAY Delay
DOD Department of Defense
DOI Descent Orbit Insertion
DORIS Doppler Orbitography and Radiopositioning Integrated by Satellite
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
DSN Deep Space Network
EASEP Early Apollo Surface Experiment Package
ECA Electrical Control Assembly
ECOM Electronics Communications
ECP engineering change proposal
ECS Environmental Control System
ECS EOSDIS Core System
ED Explosive Device
EDCP engineering design change proposal
EDD Engineering and Development Directorate
EDOS EOS Data and Operations System
EDS Emergency Detection System
E-DUMP Memory Download from Spacecraft; also known as E-MOD
ELS Earth Landing System
ELV Expendable Launch Vehicle
EMI Electromagnetic Interference
E-MOD Memory Download from Spacecraft; also known as E-DUMP
EMS entry monitor system
EMU Extravehicular Mobility Unit; Space Suit and Backpack combination
EO engineering order
EOCAP Earth Observation Commercial Applications Program
EOS Earth Observing System
EOS-AM1 EOS morning equatorial crossing (descending) satellite
EOS-CHEM1 EOS Chemistry satellite
EOSDIS EOS Data and Information System
EOSP Earth Observing Scanning Polarimeter
EOS-PM1 EOS afternoon equatorial crossing (ascending) satellite
EPS Electrical Power System
ERAST Experimental Research Aircraft Sensor Technology
ESSAAC Earth System Science and Applications Advisory Committee
ESSP Earth System Science Pathfinder
ETB Equipment Transfer Bag
ETM+ Enhanced Thematic Mapper-Plus
EV Extravehicular
eV electron volts(s)
EVA Extravehicular Activity
EVCS Extravehicular Communications Systems
F Fahrenheit or Forward Thrusting RCS Engine
FAI Fédération Aéronautique International (International Aeronautical Federation)
FAIL Failure
FAM Familiarization
FCOD Flight Crew Operations Directorate
FCSM flight combustion stability monitor
FDAI Flight Director Attitude Indicator
FDO or FIDO Flight Dynamics Officer
Fiducial Hasselblad cameras superimposed references marks (crosses) on the film
Filling a Square checking a box in XY axes on a to do list
FITH Fire In The Hole
FL Flag
FM Frequency Modulation
FOD Flight Operations Directorate
FOO Flight of Opportunity
FP Flight Progress
fps feet per second
FRAG Fragment
FREQ Frequency
FRR Flight Readiness Review
ft foot, feet
FTT Fuel Transfer Tool
FUS Far-Ultraviolet Spectrometer
FWD Forward
g gram, gravity
G specific gravity
G&C Guidance and Control
G&N Guidance and Navigation
GAEC Grumman Aircraft Engineering Corporation
GAO General Accounting Office
GAO Government Accounting Office
GASC Gas Analysis Sample Container
GASTA Gimbal Angle Sequencing Transformation Assembly
GCA Ground Controlled Approach
GCTA Ground-Command Television Assembly
GDA Gimbal Drive Actuator
GDC Gyro Display Coupler
GDO Guidance Dynamics Officer
GE General Electric
GE General Electric Company
GE General Electric Company
GET Ground-Elapsed Time
GETI Ground-Elapsed Time of Ignition
GEWEX Global Energy and Water Cycle Experiment
GFE government-furnished equipment
GLAS Geoscience Laser Altimeter System
GLEP Group for Lunar Exploration Planning
GLY Glycol
GMBL Gimbal
GMT Greenwich mean time
GNCS Guidance, Navigation and Control System
GND Ground
Gnomon weighted staff suspended on a two-ring gimbal and supported by a tripod
GOX Gaseous Oxygen
GOALS Global Ocean-Atmosphere-Land System (WCRP program)
GSE ground support equipment
GSFC Goddard Space Flight Center (Greenbelt, MD)
GUID Guidance
H Height (altitude)
H/H Altitude or Altitude Rate
H/X Heat Exchanger
H2O Water
HALOE Halogen Occultation Experiment
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
HEAO High Energy Astronomy Observatory (satellite)
HEDC Hasselblad Electric (Electronic?) Data Camera
HEDS Human Exploration and Development of Space
HF High frequency
HFE Heat Flow Experiment or Heat Flow Electronics
HGA High Gain Antenna
HI High
HIRDLS High Resolution Dynamics Limb Sounder
HL High Level
HLD Hold
HSD High Speed Data
HTC Hand-Tool Carrier
HV High Voltage
HVR Hover
Hz hertz (unit of frequency: 1 cycle per second)
IAU International Astronomical Union
IBM International Business Machines Corporation
ICBC Interagency Committee on Back Contamination
ICS Intercommunications System
ID Identification
IFR Instrument Flight Rules
IG Inner Gimbal
IGA Inner Gimbal Angle
IGBP International Geosphere-Biosphere Programme
IGN Ignition
IGOS Integrated Global Observing Strategy
ILS Instrument Landing System
IMU inertial measurement unit
IN Inlet
in inch, inches
INCO Instrumentation and Communications Officer
INCR Increase
INJ Injector
INST Instrumentation
INTEG Integrity
INVTR Inverter
IP Initial Point
IPCC Intergovernmental Panel on Climate Change
IPI Integrated Position Indicator
IRIG Inertial Rate Integrating Gyro
ISA Interim Stowage Assembly
ISOL Isolation
ISR Infrared Scanning Radiometer
ISS Inertial Sensor System or Interim Stowage Shelf
ITT International Telephone and Telegraph Corporation
IU Instrument Unit
IV Intravehicular Activity
J joule
JD Jet Driver
JETT Jettison
JPL Jet Propulsion Laboratory (Pasadena, CA)
JSC Johnson Space Center (Manned Spacecraft Center before February 1973)
K Kelvin scale
K-bird KC-135 aircraft
kg kilogram, kilograms
km kilometer(s)
km/hrs kilometers per hour
KSC Kennedy Space Center
LACE Lunar Atmospheric Composition Experiment
LAD Lunar Atmosphere Detector
LAM Landing Area Map (???)
LaRC Langley Research Center (Hampton, VA)
LAT Latitude or Lateral
LATI Landsat Advanced Technology Instrument
lb pound
LBR Low Bit Rate
lbs pounds
LC Launch Complex
LCG Liquid-Cooled Garment
LCRU Lunar Communications Relay Unit
LDD Lunar Dust Detector
LDG Landing
LEAM Lunar Ejecta And Meteorite (experiment)
LEB Lower Equipment Bay
LEC Lunar Equipment Conveyor
LEM Lunar excursion module
LeRC Lewis Research Center (Cleveland, OH)
LES Launch escape system
LEV Launch escape vehicle
LEVA Lunar Extravehicular Visor Assembly
LGC Lunar Module Guidance Computer
LGI lunar geology investigation
LHSSC Left-Hand Side Stowage Compartment
LIM Limit or Limits
LioH Lithium Hydroxide
LION Lunar International Observer Network
LIS Lightening Imaging Sensor
LLRF Lunar Landing Research Facility
LLRV Lunar Landing Research Vehicle
LLTV Lunar Landing Training Vehicle
LM Lunar Module
LMP LM Mission Programmer or Lunar Module Pilot
LMS Lunar Mass Spectrometer or Lunar Module Simulator
LMSS lunar mapping and survey system
LNA Lunar Navigation Aid
LNP Lunar Neutron Probe (experiment)
LO Low
LOC Launch Operations Center
LOI Lunar Orbit Insertion
LOLA lunar orbit and landing approach
LONG Longitude
LOPC Lunar Orbit Plane Change
LOS Loss Of Signal or Loss Of Site
LOX liquid oxygen
LPD Landing Point Designator
LPI Lunar and Planetary Institute
LPM Lunar Portable Magnetometer
LR Landing Radar
LRL Lunar Receiving Laboratory
LRRR, LR Cubed, or LR3 Lunar Ranging Retro-Reflector
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
LSI Lunar Science Institute
LSM Lunar Surface Magnetometer
LSPE Lunar Seismic Profiling Experiment
LSUC Lunar Surface Ultraviolet Camera
LTA lunar module test article
LTC Lunar Topographic Camera
LTG Lunar Traverse Gravimeter (experiment)
LTV Ling-Temco-Vought
LV Low Voltage
LVL Level
m meter, meters
M&SS Mapping and survey system
M/P Mortar Pack
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
mascons mass concentrations of dense material on lunar surface
MAX Maximum
MC megacycles
MCC MidCourse Correction
MCC (H) (K) Mission Control Center (Houston) (Kennedy)
MCCH Mission Control Center Houston
MCP mission control programmer
MCR master change record
MDC Main Display Console (CM)
MDF mild detonating fuse
MDOP maximum design operating pressure
MELV Medium Expendable Launch Vehicle
MESA Modular Equipment Stowage Assembly
MET Mission Elapsed Time, Mission Event Timer, or Mobile Equipment Transporter
MET mobile equipment transporter
MeV million electron volts
MFC Main Feeder Contactor
MG Middle Gimbal
MGA Middle Gimbal Angle
MHS Microwave Humidity Sounder
MHz megahertz (million cycles per second)
mi mile, miles
MIMR Multi-frequency Imaging Microwave Radiometer
MIN Minimum
min minute(s)
Minus Y axis South side of the LM
Minus Z axis East side of the LM
MISR Multi-angle Imaging SpectroRadiometer
MIT Massachusetts Institute of Technology
MLELV Medium-Lite Expendable Launch Vehicle
MLS Microwave Limb Sounder
mm millimeter
MMH monomethylhydrazine
MOCR Mission Operations Control Room
MODIS Moderate-Resolution Imaging Spectroradiometer
MOL Manned Orbiting Laboratory
MOPITT Measurements of Pollution in the Troposphere
MPA Mortar Pack Assembly
MPX Multiplex
MRB Material Review Board
MSB Most Significant Bit
MSC Manned Spacecraft Center; now Johnson Space Center
MSF Manned Space Flight
MSFC Marshall Space Flight Center (Huntsville, AL)
MSFN Manned Space Flight Network (pronounced "Miss Finn")
MSOB Manned Spacecraft Operations Building at the Kennedy Space Center
MSSC Magnetic Shield Sample Container
MTPE Mission to Planet Earth
MTR Meter
MTVC Manual Thrust Vector Control
Mw megawatt(s)
N/A Not Applicable
N2O4 Nitrogen Tetroxide, oxidizer used in the DPS and APS
NAA North American Aviation, Inc. (until Sept. 22, 1967)
NACA National Advisory Committee for Aeronautics
NAR (NR) North American Rockwell Corporation (Sept. 22, 1967-Feb. 16, 1973; then Rockwell International Corporation)
NAS National Academy of Sciences
NASA National Aeronautics and Space Administration
NASA National Aeronautics and Space Administration
NASA National Aeronautics and Space Administration
NASM National Air and Space Museum, Smithsonian Institution
NAV Navigation
NB Narrow Band
NDSC Network for Dectection of Stratospheric Change
NGO Non-Governmental Organization
nm nautical miles
NMP New Millennium program
NOAA National Oceanic and Atmospheric Administration
NORM Normal
NPOESS National Polar-orbiting Operational Environmental Satellite System
NR North American Rockwell Corporation
NRC National Research Council
NSCAT NASA Scatterometer
NSSDC National Space Science Data Center
NTS Nevada Test Site
O2 Oxygen
OAO Orbiting Astronomical Observatory (satellite)
OART Office of Advanced Research and Technology, NASA Headquarters
OAS optical alignment sights
OB OnBoard
OCP Operational Checkout Procedure
OCS Organic Control Sample
ODUS Ozone Dynamics Ultraviolet Spectrometer
OG Outer Gimbal
OGA Outer Gimbal Angel
OMS Observation from the Middle Stratosphere
OMSF Office of Manned Space Flight, NASA Headquarters
OPN Open
OPR Operate
OPS Oxygen Purge System
ORDEAL Orbital Rate Display Earth And Lunar
ORDEAL orbital rate drive electronics for Apollo and LM
ORI Operational readiness inspection
OSO Orbiting Solar Observatory (satellite)
OSSA Office of Space Science and Applications, NASA Headquarters
OSTP Office of Science and Technology Policy
OTD Optical Transient Detector
OTDA Office of Tracking and Data Acquisition, NASA Headquarters
OUT Outlet or Output
OVR Over
OVRD Override
OX Oxidizer or Oxygen
P00 Program Zero-Zero, pronounced "pooh"
P22 Program 22
PA Power Amplifier
PAD Pre-Advisory Data
PAD project approval document
PAO Public Affairs Office
PARC Public Access Resource Center
Parker Valves part of the RCS propellant feed system
PART Partial
PCA Program Coupler Assembly
PCM Pulse Code Modulation
PCT Per Cent
PDI Powered Descent Initiation
PDR Preliminary Design Review
PEM Pacific Exploratory Mission
PFS Per Cent Full Scale
PGA Pressure Garment Assembly
PGNCS Primary Guidance, Navigation, and Control System
PGNS Primary Guidance and Navigation System (pronounced "pings")
PHS Public Health Service
PI Principal Investigator
PIB Pyrotechnic Installation Building
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 Phase Modulator 1??/Wideband
PNLS Panels
PO Power Output
pogo launch vehicle induced oscillations (not an acronym; derived from "pogo stick" analogy)
POLARIS Photochemistry of Ozone Loss in the Arctic Region in Summer
POS Position
PPK Personal Preference Kits
PQMD Propellant Quantity Measuring Device
PR Precipitation Radar
PRA Program Reader Assembly
PRD Personal Radiation Dosimeter
PRELIM Preliminary
PRESS Pressure
PRIM Primary
PRO Proceed
PROG Program
PROP Propellant or Propulsion
PSAC President's Scientific Advisory Committee
PSE(P) Passive Seismic Experiment (Package)
psi pounds per square inch
PSIA Pounds Per Square Inch Absolute
psia pounds per square inch absolute
psia pounds per square inch average
PSID Pounds Per Square Inch Differential
PTA Pulsed Torque Assembly
PTC Passive Thermal Control; also known as the Barbeque mode
PTT Push-To-Talk
PTV parachute test vehicle
PVR Percent Voltage Reference
PWM Pulse Width Modulation
PWR Power
PYRO Pyrotechnic
QD Quick Disconnect
QTY Quantity
QUAD Quadrant
R (Computer) Register
RAD Radiation
Range Rate Change in range per unit time
RASPO Resident Apollo Spacecraft Program Office
RC/OC Reverse Current/OverCurrent
RCA Radio Corporation of America
RCS Reaction Control System
RCU Remote Control Unit
RCVR Receiver
R-Dot Rate of Change in range; rate of approach
REACQ Reacquire
REC Recorder
RECD Received
REF Reference
REFSMMAT Reference Stable Member Matrix or, sometimes, Reference to Stable Member Matrix
REG Regulator
REL Release
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
RPV Remotely Piloted Vehicle
RR Rendezvous Radar
RS Remote Site
RSVR Resolver
RTCC Real Time Computer Complex
RTG Radioisotopic Thermoelectric Generator
RTV Room Temperature Vulcanising
RUPT Rupture
S Sideward Thrusting RCS Engine
S/C spacecraft
S/O Shut Off
S/S Samples per Second
SAGE III Stratospheric Aerosol and Gas Experiment III
SAMSO Space and Missiles Organization, Air Force
SAR Synthetic Aperture Radar
SAS Space Adaptation Syndrome
S-BND S-Band
SBT S-Band Transponder
SCB Sample Collection Bag
SCE Signal-Conditioning Equipment
SCS Stabilization and Control System
SE Systems Engineer
SeaWiFS Sea-Viewing Wide Field Sensor
SEB Scientific Equipment Bay
SEB Source Evaluation Board
SEC Secondary, Second, or Special Environmental Container
sec second(s)
SECS Sequential Events Control System
SEF Sharp End Forward
SEL Select
SENS Sensitivity
SEP Separation, Separator, or Surface Electric Properties (experiment)
SEQ Sequence or Scientific Equipment Bay
SEQ scientific equipment
SESC Special Environmental Sample Container
SESL Space Environmental Simulation Laboratory
SET Set or Setting
SEVA Stand-up extravehicular activity
SHE SuperCritical Helium
S-IB Saturn IB launch vehicle first stage
S-IC Saturn V launch vehicle first stage
SID Space and Information Systems Division, NAA
SIDE Suprathermal Ion Detection Experiment
SIG Signal
S-II Saturn second stage
SIM Scientific Instrument Module or Simulation
SIR-C/X-SAR Spaceborne Imaging Radar-C/X-band SAR
S-IVB Saturn IB second stage; Saturn V third stage
SLA Spacecraft Launch Adapter or SM/LM Adapter
SLSS supplementary life support system
SM Service Module
SME Soil Mechanics Experiment
SNAP-27 System for Nuclear Auxiliary Power, Model 27
SOL Solenoid
SOLSTICE Solar Stellar Irradiance Comparison Experiment
SONEX Subsonic Ozone and Nitrogen Experiment
SOV Shut Off Valve
SP Spare
SPEC Specification
SPF single point failure
SPS Service Propulsion System
sq cm square centimeter(s)
sq m square meter, square meters
SRC Sample Return Container; the rock boxes
SRP Self-Recording Penetrometer
SSALT Solid-State Altimeter
SSC SpaceSuit Communicator
SSC space suit communications
SSC Stennis Space Center (Slidell, MS)
SSD Sun Shadow Device
SSM/I Special Sensor Microwave/Imager
SSR Staff Support Room
ST Static
STAG Scientific and Technical Advisory Committee, university-NASA
STBY Standby
STG Space Task Group, NASA
STGE Stage
STL Space Technology Laboratories, Inc.
STR Strength
STRAT Stratospheric Tracers of Atmospheric Transport
STRB Strobe
SUP Supply
SUSP Suspension
SVO Servo
SW Switch
SWC Solar Wind Composition Collector
SWIP Super Weight Improvement Program
SWS Solar Wind Spectrometer
SYNCH Synchronization
SYS System
T/G Thumper/Geophone Experiment
TB TalkBack
TCA Thrust Chamber Assembly
TCP Thrust Chamber Pressure
TCP test and checkout procedures
TCU Television Control Unit
TDRSS Tracking and Data Relay Satellite System
TDS Thermal Degradation Sample
TEI Transearth Injection
TELEMU Telemetry
TEMP Temperature
Tephem Time of Ephemeris
TES Tropospheric Emission Spectrometer
TGE Traverse Gravimeter Experiment
THROT Throttle
TIG or Tig Time of Ignition
TJM Tower Jettison Motor
TK Tank
TLC Translunar Coast
TLI Translunar Injection
TLM or TM Telemetry
TM test model
TMI TRMM Microwave Imager
TOL Tolerance
TOMS Total Ozone Mapping Spectrometer
TOPEX/ Poseidon Ocean Topographic Experiment (w/France)
TPI Terminal Phase Initiation
TR Transmit/Receive
TRACE-B Transport and Chemistry near the Equator-Atlantic (2nd)
TRANS Translation
Travono (possibly Travano) A gray-brown plastic used in the LM to protect surfaces
TRMM Tropical Rainfall Measuring Mission (w/Japan)
TRUN Trunnion
TSB Temporary Stowage Bag
TTCA Thrust/Translation Controller Assembly
TTHR Tether
TTY Teletype or Teletypewriter
TV thermal vacuum-test article; also television
TVC Thrust Vector Control
U Upward Thrusting RCS Engine
U.S. United States of America
U.S.S.R. Union of Soviet Socialist Republics
UARS Upper Atmosphere Research Satellite
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
USDA United States Department of Agriculture
USGCRP United States Global Change Research Program
UV Ultraviolet
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
VIRS Visible InfraRed Scanner
VLV(S) Valve(s)
VOTE/TOTE Vortex Ozone Transport Experiment/ Tropical Ozone Transport Experiment
VOX Voice Activated Transmission
VPI Valve Position Indicator
VR Vector Ranging
VRMS Volt Root Mean Square
W Watts
W/B Water Boiler
WB WideBand
WCRP World Climate Research Program
WIF Water Immersion Facility
WILCO Will Comply
WSMR White Sands Missile Range, Army
WSTF White Sands Test Facility, MSC, NASA
X Cross
X Axis Vertical Axis
XMTR Transmitter
XPNDR Transponder
Y Axis Left to Right Axis
Z Axis Fore/Aft Axis
Z Bag Storage Bag stored at the minus Z Bulkhead