Dictionary

Word	Description
A	One of four Omni Directional Control Antennas
ACA	Attitude Control Assembly
ACQ	Acquisition
AELD	Ascent Engine Latching Device
AGC	Apollo Guidance Computer
AGC	Abort Guidance System
ALIGN	Alignment
ALM	Alarm
ALT	Altimeter
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
AP	Alpha Particle (spectrometer)
APS	Auxiliary Propulsion System (S-IVB) or Ascent Propulsion System (LM)
ARIA	Apollo Range Instrumentation Aircraft
ARM	Armed
ARS	Atmosphere Revitalization System
ASA	Abort Sensor Assembly
ASAP	As Soon As Possible
ASC	Ascent
ASR	Area Surveillance Radar
ASSY	Assembly
ATCA	Attitude & Translation Control Assembly
ATT	Attitude
AUTO	Automatic
AUX	Auxiliary
AVAIL	Available
AZ	Azimuth
B	One of Four Omni Directional Control Antennas, known as Omni Bravo
BAT	Battery
BATT	Battery
BCN	Beacon
BEF	Blunt End Forward
BIP	Bipropellant
BMAG	Body Mounted Attitude Gyros
BP	Barber Pole
BPS	Bits Per Second or Bits Per Sample
BTH	Both
BUSS	Biomedical Urine Sampling System
C	One of Four Omni Directional Control Antennas, known as Omni Charlie
C-BND	C-Band
CAL	Calibrate or Calibration
CALC	Calculate or Calculated
CAPCOM	Spacecraft Communicator
CB	Circuit Breaker
CDU	Coupling Data Units
CES	Control Electronics Section
CG	Center of Gravity
CL	Close
CLSD	Closed
CM	Command Module
CM RCS	Command Module Reaction Control System
CMD	Command
CMDED	Commanded
CMP	Command Module Pilot
CNTL	Control
CO2	Carbon Dioxide
COAS	Crewman Optical Alignment Sight
COAS	Crewman Optical Alignment Sight
COMM	Communications
COND	Condition, Conditioning or Conditioner
CONFIG	Configuration
CONT	Continue
COOL	Coolant
CP	Command Pilot or Control Point
CPS	Cycles Per Second
CRSFD	Crossfeed
CRYO	Cryogenic
CSI	Coelliptic Sequence Initiation
CSM	Command/Service Module
CSS	Computer Subsystem
CWS	Caution and Warning System
D	Downward Thrusting RCS Engine or One of Four Omni Directional Control Antennas, known as Omni Delta
DAP	Digital Autopilot
DB	Decibel
DC	Direct Current
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
DLAY	Delay
DOI	Descent Orbit Insertion
DPLY	Deploy or Deployed
DPS	Descent Propulsion System
DR	Dead Reckoning or Descent Rate
DSE	Data Storage Equipment
DSEA	Data Storage Electronics Assembly
DSKY	DiSplayKeYboard
E-DUMP	Erasable-Memory Download
E-MOD	Erasable-Memory Download
ECA	Electronics Control Assembly
ECOM	Electronics Communications
ED	Explosive Device
EDS	Emergency Detection System
ELS	Earth Landing System
EMI	Electromagnetic Interference
EMS	Entry Monitoring System
Ephemeris	gives the positions of naturally occurring astronomical objects as well as artificial satellites in the sky at a given time or times
EVA	Extravehicular Activity
F	Fahrenheit or Forward Thrusting RCS Engine
FAIL	Failure
FDAI	Flight Director Attitude Indicator
FITH	Fire In The Hole
FL	Flag
FM	Frequency Modulation
FP	Flight Progress
FRAG	Fragment
FREQ	Frequency
FWD	Forward
G&C	Guidance and Control
G&N	Guidance and Navigation
GASTA	Gimbal Angle Sequencing Transformation Assembly
GCA	Ground Controlled Approach
GDA	Gimbal Drive Actuator
GDC	Gyro Display Coupler
GET	Ground-Elapsed Time
GETI	Ground-Elapsed Time of Ignition
GLY	Glycol
GMBL	Gimbal
GNCS	Guidance, Navigation and Control System
GND	Ground
GOX	Gaseous Oxygen
GPI	Gimbal Position Indicator
GUID	Guidance
H-dot	Time derivative of height (H); Descent Rate or Ascent Rate. In mathematical notation, the time (t) derivative of height (H) can be written as dH/dt or as Ḣ
H/H	Altitude or Altitude Rate
H/X	Heat Exchanger
H2O	Water
HBR	High Bit Rate
HE	Helium
HGA	High Gain Antenna
HI	High
HL	High Level
HLD	Hold
HSD	High-Speed Data
HV	High Voltage
HVR	Hover
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
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
ISOL	Isolation
ISS	Inertial Subsystem
JETT	Jettison
KEY REL	Key Release
LAT	Latitude or Lateral
LBR	Low Bit Rate
LCRU	Lunar Communications Relay Unit
LDG	Landing
LGC	Lunar Module Guidance Computer
LIM	Limit or Limits
LiOH	Lithium Hydroxide
LM	Lunar Module
LMP	LM Mission Programmer or Lunar Module Pilot
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
LR	Landing Radar
LSB	Least Significant Bit
LV	Low Voltage
LVL	Level
MA	Master Alarm
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
MET	Mission Elapsed Time, Mission Event Timer
MFC	Main Feeder Contactor
MG	Middle Gimbal
MGA	Middle Gimbal Angle
MIN	Minimum
MOCR	Mission Operations Control Room
MPX	Multiplex
MSB	Most Significant Bit
MSC	Manned Spacecraft Center
MSFN	Manned Space Flight Network
MSOB	Manned Spacecraft Operations Building
MTR	Meter
MTVC	Manual Thrust Vector Control
N/A	Not Applicable
N204	Nitrogen Tetroxide
NAV	Navigation
NB	Narrow Band
NORM	Normal
O2	Oxygen
OB	OnBoard
OBC	On-Board Computer
OG	Outer Gimbal
OGA	Outer Gimbal Angle
OPN	Open
OPR	Operate
OPS	Oxygen Purge System
ORDEAL	Orbital Rate Display Earth And Lunar
OSS	Optics Subsystem
OUT	Outlet or Output
OVR	Over
OVRD	Override
OX	Oxidizer or Oxygen
P00	Program Zero-Zero
P22	LM computer program that uses the rendezvous radar to track the Command Module
PA	Power Amplifier
PAD	Preliminary Advisory Data
PART	Partial
PCA	Program Coupler Assembly
PCM	Pulse Code Modulation
PCT	Per Cent
PDI	Powered Descent Initiation
PFS	Per Cent Full Scale
PGNCS	Primary Guidance Navigation and Control System
PGNS	Primary Guidance and Navigation System
PIA	Pre-Installation Acceptance
PIPA	Pulse Integrated Pendulous Accelerometers
PLSD	Pulsed
PLSS	Portable Life Support System
PM	Phase Modulation
PM1/NB	Phase Modulator 1/Narrowband
PM1/WB	Phase Modulator 1/Wideband
PMQD	Propellant Quantity Measuring Device
PNLS	Panels
PO	Power Output
POS	Position
PRA	Program Reader Assembly
PRD	Personal Radiation Dosimeter
PRELIM	Preliminary
PRESS	Pressure
PRIM	Primary
PRO	Proceed
PROG	Program
PROP	Propellant or Propulsion
PSIA	Pounds Per Square Inch Absolute
PSID	Pounds Per Square Inch Differential
PTA	Pulsed Torque Assembly
PTC	Passive Thermal Control
PTT	Push-To-Talk
PUGS	Propellant Utilization and Gauging Subsystem
PVR	Percent Voltage Reference
PWM	Pulse Width Modulation
PWR	Power
PYRO	Pyrotechnic
QD	Quick Disconnect
QTY	Quantity
QUAD	Quadrant
R-Dot	Rate of approach; time (t) derivative of range, which can be written mathematically as dR/dt or Ṙ
RAD	Radiation
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
REG	Regulator
REL	Release
RET	Retract or Return
REV	Reverse
RF	Radio Frequency
RFLT	Reflect or Reflected
RGA	Rate Gyro Assembly
RJ/EC	Reaction Jet and Engine On-Off Control
RLS	Radius of Landing Site or Reference Landing Site
RLY	Relay
RNG	Range or Ranging
ROD	Rate of Descent
RR	Rendezvous Radar
RS	Remote Site
RSVR	Resolver
RTG	Radioisotopic Thermoelectric Generator
RTV	Room Temperature Vulcanizing
RUPT	Rupture
S	Sideward Thrusting RCS Engine
S-BND	S-Band
S/C	Spacecraft
S/O	Shut Off
S/S	Samples per Second
SBT	S-Band Transponder
SCE	Signal-Conditioning Equipment
SCS	Stabilization and Control System
SEC	Secondary, Second
SECS	Sequential Events Control Subsystem
SEF	Sharp End Forward
SEL	Select
SENS	Sensitivity
SEP	Separation, Separator
SEQ	Sequence
SET	Set or Setting
SHE	SuperCritical Helium
SIG	Signal
SIM	Scientific Instrument Module
SLA	Spacecraft Launch Adapter or SM/LM Adapter
SM	Service Module
SM RCS	Service Module Reaction Control System
SNAP-27	System for Nuclear Auxiliary Power, Model 27
SOL	Solenoid
SOV	Shut Off Valve
SP	Spare
SPEC	Specification
SPS	Service Propulsion System
ST	Static
STBY	Standby
STGE	Stage
STR	Strength
STRB	Strobe
SUP	Supply
SUSP	Suspension
SVO	Servo
SW	Switch
SYNCH	Synchronization
SYS	System
T/R	Transmit/Receive
TB	TalkBack
TCA	Thrust Chamber Assembly
TCP	Thrust Chamber Pressure
TCU	Television Control Unit
TEC	Transearth Coast
TEI	Transearth Injection
TELEMU	Telemetry
TEMP	Temperature
Tephem	Time of Ephemeris
THC	Translation Hand Controller
THROT	Throttle
TIG	Time of Ignition
TJM	Tower Jettison Motor
TK	Tank
TLC	Translunar Coast
TLI	Translunar Injection
TLM	Telemetry
TM	Telemetry
TOL	Tolerance
TPI	Terminal Phase Initiation
TRANS	Translation
TRUN	Trunnion
Trunnion	a cylindrical protrusion used as a mounting or pivoting point
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
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
W/B	Water Boiler
WB	WideBand
WILCO	Will Comply
X	Cross
X Axis	Vertical Axis
X-Pointer	Crosspointer
XMTR	Transmitter
XPNDR	Transponder
Y Axis	Left to Right Axis
Z Axis	Fore/Aft Axis
ΔV	Delta V