Lexicon

A/C AIRCRAFT
AC ALTERNATING CURRENT
ACS AIRCRAFT CONTROL SYSTEM
ADC AIR DATA COMPUTER
ADEPT AIRLINE DATA ENGINE PERFORMANCE TREND
ADIRS AIR DATA AND INERTIAL REFERENCE SYSTEM
ADIRU AIR DATA AND INERTIAL REFERENCE UNIT
ADV ADVISORY
AFS AUTO FLIGHT SYSTEM
AIDS AIRCRAFT INTEGRATED DATA SYSTEM
ALT ALTITUDE
ALTN ALTERNATE
AMB AMBIENT
A/P AIR PLANE
ARINC AERONAUTICAL RADIO, INC. (SPECIFICATION)
ASM AUTOTHROTTLE SERVO MECHANISM
A/T AUTOTHROTTLE
ATC AUTOTHROTTLE COMPUTER
ATHR AUTO THRUST
ATO ABORTED TAKE OFF

BAI BOOSTER ANTI-ICING
BMC BLEED MANAGEMENT COMPUTER
BSV BURNER STAGING VALVE (SAC)
BSV BURNER SELECTION VALVE (DAC)
BVCS BLEED VALVE CONTROL SOLENOID

C CELSIUS or CENTIGRADE
CAS CALIBRATED AIR SPEED
CBP (HP) COMPRESSOR BLEED PRESSURE
CCDL CROSS CHANNEL DATA LINK
CCFG COMPACT CONSTANT FREQUENCY GENERATOR
CCT CORE COMPARTMENT TEMPERATURE
CCU COMPUTER CONTROL UNIT
CDS COMMON DISPLAY SYSTEM
CFDIU CENTRALIZED FAULT DISPLAY INTERFACE UNIT
CFDS CENTRALIZED FAULT DISPLAY SYSTEM
CHATV CHANNEL ACTIVE
CIP (HP) COMPRESSOR INLET PRESSURE
CIT (HP) COMPRESSOR INLET TEMPERATURE
CLP COWL LOST PREVENTION
cm.g CENTIMETER X GRAMS
CMC CENTRALISED MAINTENANCE COMPUTER
CMS CENTRALIZED MAINTENANCE SYSTEM
CMS CENTRAL MAINTENANCE SYSTEM
CODEP HIGH TEMPERATURE COATING
CONT CONTINUOUS
CPU CENTRAL PROCESSING UNIT
CRT CATHODE RAY TUBE
CRTG CARTDRIGE
CSD CONSTANT SPEED DRIVE
CTAI COWL THERMAL ANTI-ICING
CTL CONTROL
Cu.Ni.In COPPER.NICKEL.INDIUM
CW CLOCKWISE

D&C DELAY AND CANCELLATION
DAC DOUBLE ANNULAR COMBUSTOR
DAMV DOUBLE ANNULAR MODULATED VALVE
DAR DIGITAL ACMS RECORDER
DC DIRECT CURRENT
DCU DATA CONVERSION UNIT
DCV DIRECTIONAL CONTROL VALVE (BOEING)
DEU DISPLAY ELECTRONIC UNIT
DFCS DIGITAL FLIGHT CONTROL SYSTEM
DFDAU DIGITAL FLIGHT DATA ACQUISITION UNIT
DFDRS DIGITAL FLIGHT DATA RECORDING SYSTEM
DISC DISCRETE
DIU DIGITAL INTERFACE UNIT
DMC DISPLAY MANAGEMENT COMPUTER
DMD DEMAND
DMU DATA MANAGEMENT UNIT
DOD DOMESTIC OBJECT DAMAGE
DPU DIGITAL PROCESSING MODULE
DPM DEBRIS PARTICLE MONITORING
DRT DE-RATED TAKE-OFF

ECA ELECTRICAL CHASSIS ASSEMBLY
ECAM ELECTRONIC CENTRALIZED AIRCRAFT MONITORING
EDP ENGINE DRIVEN PUMP
EE ELECTRONIC EQUIPMENT
EEC ELECTRONIC ENGINE CONTROL
EFH ENGINE FLIGHT HOURS
EFIS ELECTRONIC FLIGHT INSTRUMENT SYSTEM
EHSV ELECTRO-HYDRAULIC SERVO VALVE
EICAS ENGINE INDICATING AND CREW ALERTING SYSTEM
EIS ELECTRONIC INSTRUMENT SYSTEM
EIU ENGINE INTERFACE UNIT
EIVMU ENGINE INTERFACE AND VIBRATION MONITORING UNIT
EMDP ELECTRICAL MOTOR DRIVEN PUMP
EMF ELECTROMOTIVE FORCE
EMI ELECTRO MAGNETIC INTERFERENCE
EMU ENGINE MAINTENANCE UNIT
EPROM ERASABLE PROGRAMMABLE READ ONLY MEMORY
(E)EPROM (ELECTRICALLY) ERASABLE PROGRAMMABLE READ ONLY MEMORY
EPS ENGINE POWER SUPPLY
ETL ELECTRICAL TERTIARY LOCK
EVMU ENGINE VIBRATION MONITORING UNIT
EWD/SD ENGINE WARNING DISPLAY / SYSTEM DISPLAY

F FAHRENHEIT
FAR FUEL/AIR RATIO
FAV FAN AIR VALVE
F/B FEEDBACK
FCC FLIGHT CONTROL COMPUTER
FCU FLIGHT CONTROL UNIT
FCD FAN COWL DOOR
FDAMS FLIGHT DATA ACQUISITION & MANAGEMENT SYSTEM
FDAU FLIGHT DATA ACQUISITION UNIT
FDIU FLIGHT DATA INTERFACE UNIT
FDRS FLIGHT DATA RECORDING SYSTEM
FDU FIRE DETECTION UNIT
FEIM FIELD ENGINEERING INVESTIGATION MEMO
FF FUEL FLOW (see Wf) -7B
FFCCV FAN FRAME/COMPRESSOR CASE VERTICAL (VIBRATION SENSOR)
FHA FUNCTIONAL HAZARD ASSESSMENT
FI FLIGHT IDLE (F/I)
FIN FUNCTIONAL ITEM NUMBER
FIT FAN INLET TEMPERATURE
FLA FORWARD LOOKING AFT
FLX TO FLEXIBLE TAKE-OFF
FLSCU FUEL LEVEL SENSING CONTROL UNIT
FMC FLIGHT MANAGEMENT COMPUTER
FMCS FLIGHT MANAGEMENT COMPUTER SYSTEM
FMGC FLIGHT MANAGEMENT AND GUIDANCE COMPUTER
FMGEC FLIGHT MANAGEMENT AND GUIDANCE ENVELOPE COMPUTER
FMS FLIGHT MANAGEMENT SYSTEM
FMV FUEL METERING VALVE
FOD FOREIGN OBJECT DAMAGE
FPA FRONT PANEL ASSEMBLY
FQIS FUEL QUANTITY INDICATING SYSTEM
FRV FUEL RETURN VALVE
FSDP FUEL STRAINER DELTA PRESSURE
FTA FAULT TREE ANALYSIS
FWC FAULT WARNING COMPUTER

g.in GRAM X INCHES
GEM GROUND-BASED ENGINE MONITORING
GI GROUND IDLE (G/I)
GMM GROUND MAINTENANCE MODE
GMT GREENWICH MEAN TIME
GND GROUND
GPH GALLONS PER HOUR
GPU GROUND POWER UNIT

HCF HIGH CYCLE FATIGUE
HDS HORIZONTAL DRIVE SHAFT
HMU HYDROMECHANICAL UNIT
HOR HOLD OPEN ROD
HPCR HIGH PRESSURE COMPRESSOR ROTOR
HPRV HIGH PRESSURE REGULATING VALVE
HPSOV HIGH PRESSURE SHUT-OFF VALVE
HPT(A)CC HIGH PRESSURE TURBINE (ACTIVE) CLEARANCE CONTROL
HPTC HIGH PRESSURE TURBINE CLEARANCE
HPTCCV HIGH PRESSURE TURBINE CLEARANCE CONTROL VALVE
HPTN HIGH PRESSURE TURBINE NOZZLE
HPTR HIGH PRESSURE TURBINE ROTOR
Hz HERTZ (CYCLES PER SECOND

I/O INPUT/OUTPUT
IAS INDICATED AIR SPEED
ICU ISOLATION CONTROL UNIT
ID PLUG IDENTIFICATION PLUG
IFS INNER FIXED STRUCTURE
IFTB IN FLIGHT TURN BACK
IGN IGNITION
in. INCHES
IOM INPUT OUTPUT MODULE
IPB ILLUSTRATED PARTS BREAKDOWN
IPC ILLUSTRATED PARTS CATALOG
IPCV INTERMEDIATE PRESSURE CHECK VALVE
IPS INCHES PER SECOND
IR INFRA RED
IV THRUST REVERSER ISOLATION VALVE

K KELVIN
k X 1000
kg/h KILOGRAMS PER HOUR
KIAS INDICATED AIR SPEED IN KNOTS
kV KILOVOLTS

L LEFT
L/H LEFT HAND
lbs. POUNDS, WEIGHT
LCD LIQUID CRYSTAL DISPLAY
LCF LOW CYCLE FATIGUE
LE (L/E) LEADING EDGE
LG LANDING GEAR
LGCIU LANDING GEAR CONTROL INTERFACE UNIT
Loil OIL LEVEL
LOTC LOSS OF THRUST CONTROL
LP LOW PRESSURE
LPT(A)CC LOW PRESSURE TURBINE (ACTIVE) CLEARANCE CONTROL
LPTC LOW PRESSURE TURBINE CLEARANCE
LPTN LOW PRESSURE TURBINE NOZZLE
LPTR LOW PRESSURE TURBINE ROTOR
LU LUBRICATION UNIT
LVDT LINEAR VARIABLE DIFFERENTIAL TRANSDUCER

mA MILLIAMPERES (CURRENT)
MCD MAGNETIC CHIP DETECTOR
MCDU MULTIPURPOSE CONTROL AND DISPLAY UNIT
MCL MAXIMUM CLIMB
MCR MAXIMUM CRUISE
MCT MAXIMUM CONTINUOUS
MDDU MULTIPURPOSE DISK DRIVE UNIT
MEC MAIN ENGINE CONTROL
milsD.A. Mils DOUBLE AMPLITUDE
mm. MILLIMETERS
MM MAJOR MODULE
Mm MINOR MODULE
MO AIRCRAFT SPEED MACH NUMBER
MPA MAXIMUM POWER ASSURANCE
MPH MILES PER HOUR
MTC MODULATED TURBINE COOLING
mV MILLIVOLTS
MVDC MILLIVOLTS DIRECT CURRENT

N1 (NL) LOW PRESSURE ROTOR ROTATIONAL SPEED
N1* DESIRED N1
N1ACT ACTUAL N1
N1CMD COMMANDED N1
N1DMD DEMANDED N1
N1K CORRECTED FAN SPEED
N1TARGET TARGETED FAN SPEED
N2 (NH) HIGH PRESSURE ROTOR ROTATIONAL SPEED
N2* DESIRED N2
N2ACT ACTUAL N2
N2K CORRECTED CORE SPEED
N/C NORMALLY CLOSED
N/O NORMALLY OPEN
NAC NACELLE
NAI NACELLE ANTI-ICE
NVM NON VOLATILE MEMORY

OAT OUTSIDE AIR TEMPERATURE
OFDPS OIL FILTER DELTA PRESSURE SENSOR
OLS OIL LEVEL SENSOR
OPTS OIL PRESSURE AND TEMPERATURE SENSOR
OPV OVERPRESSURE VALVE
OSG OVERSPEED GOVERNOR
OFS OUTER FIXED STRUCTURE
OVBD OVERBOARD
OVHT OVERHEAT

Pb BYPASS PRESSURE
Pc REGULATED SERVO PRESSURE
Pcr CASE REGULATED PRESSURE
Pf (CFM56-7B) HEATED SERVO PRESSURE
P/T25 HP COMPRESSOR INLET TOTAL AIR PRESSURE TEMPERATURE
P/B PUSH BUTTON
P/N PART NUMBER
P0 AMBIENT STATIC PRESSURE
P25 HP COMPRESSOR INLET TOTAL AIR PRESSURE
PAS PNEUMATIC AIR STARTER
PCU PRESSURE CONVERTER UNIT
PDL PORTABLE DATA LOADER
PEO ENGINE OIL PRESSURE
PLA POWER LEVER ANGLE
PMC POWER MANAGEMENT CONTROL
PMUX PROPULSION MULTIPLEXER
PPH POUNDS PER HOUR
PRSOV PRESSURE REGULATING SHUT-OFF VALVE
PRV PRESSURE RELIEF VALVE
Ps PUMP SUPPLY PRESSURE
Psf HEATED SERVO PRESSURE
PS12 FAN INLET STATIC AIR PRESSURE
PS13 FAN OUTLET STATIC AIR PRESSURE
PS3HP COMPRESSOR DISCHARGE STATIC AIR PRESSURE (CDP)
PSI POUNDS PER SQUARE INCH
PSIA POUNDS PER SQUARE INCH ABSOLUTE
PSID POUNDS PER SQUARE INCH DIFFERENTIAL
PSIG POUNDS PER SQUARE INCH GAGE
PSM POWER SUPPLY MODULE
PSS PRESSURE SUB-SYSTEM
PSSA PRELIMINARY SYSTEM SAFETY ASSESSMENT
PSU POWER SUPPLY UNIT
PT TOTAL PRESSURE or PRESSURE TRANSDUCER
PT2 FAN INLET TOTAL AIR PRESSURE (PRIMARY FLOW)
PT25 HPC TOTAL INLET PRESSURE
PTU POWER TRANSFER UNIT

QAD QUICK ATTACH DETACH
QAR QUICK ACCESS RECORDER
QWR QUICK WINDMILL RELIGHT

 

R/H RIGHT HAND
RAC/SB ROTOR ACTIVE CLEARANCE/START BLEED
RACC ROTOR ACTIVE CLEARANCE CONTROL
RAM RANDOM ACCESS MEMORY
RCC REMOTE CHARGE CONVERTER
RDS RADIAL DRIVE SHAFT
RPM REVOLUTIONS PER MINUTE
RTD RESISTIVE THERMAL DEVICE
RTO REFUSED TAKE OFF
RTV ROOM TEMPERATURE VULCANIZING (MATERIAL)
RVDT ROTARY VARIABLE DIFFERENTIAL TRANSDUCER

S/R SERVICE REQUEST
S/TM SOLENOID/TORQUE MOTOR
S/V SHOP VISIT
SAC SINGLE ANNULAR COMBUSTOR
SACOC SURFACE AIR COOLING OIL COOLER
SAR SMART ACMS RECORDER
SAV STARTER AIR VALVE
SBV START BLEED VALVE
SCU SIGNAL CONDITIONING UNIT (CFM56)
SCU/SVA SPLIT CONTROL UNIT /SERVO-VALVE ASSY (LEAP)
SDAC SYSTEM DATA ACQUISITION CONCENTRATOR
SDI SOURCE/DESTINATION IDENTIFIER (BITS) (CF ARINC SPEC)
SDU SOLENOID DRIVER UNIT
SER SERVICE EVALUATION REQUEST
SFCC SLAT FLAP CONTROL COMPUTER
SFLA SYNCHRONIZED LOCKING FEEDBACK ACTUATOR
SMLA SYNCHRONIZED MANUAL LOCKING ACTUATOR
SNLA SYNCHRONIZED NON-LOCKING ACTUATOR
SG SPECIFIC GRAVITY
SLS SEA LEVEL STANDARD (CONDITIONS: 29.92 in.Hg / 59°F)
SLSD SEA LEVEL STANDARD DAY (CONDITIONS: 29.92 in.Hg /59°F)
SMP SOFTWARE MANAGEMENT PLAN
STP STANDARD TEMPERATURE & PRESSURE
STS STATUS
SVA SERVO VALVE ASSEMBLY
SVR SHOP VISIT RATE
SW SWITCH
SYS SYSTEM

T oil OIL TEMPERATURE
T/C THERMOCOUPLE
T/E TRAILING EDGE
T/O TAKE OFF
TO/GA TAKE OFF/GO AROUND
T/P TEMPERATURE/PRESSURE SENSOR
T12 FAN INLET TOTAL AIR TEMPERATURE
T25 HP COMPRESSOR INLET AIR TEMPERATURE
T3 HP COMPRESSOR DISCHARGE AIR TEMPERATURE
T48 EXHAUST GAS TEMPERATURE (LEAP)
T49.5 EXHAUST GAS TEMPERATURE (CFM 56)
T5 LOW PRESSURE TURBINE DISCHARGE TOTAL AIR TEMPERATURE
TAI THERMAL ANTI ICE
TAT TOTAL AIR TEMPERATURE
TBC THERMAL BARRIER COATING
TBV TRANSIENT BLEED VALVE
TC(TCase) HP TURBINE CASE TEMPERATURE
TCC TURBINE CLEARANCE CONTROL
TCCV TURBINE CLEARANCE CONTROL VALVE
TCJ TEMPERATURE COLD JUNCTION
T/E TRAILING EDGE
TECU ELECTRONIC CONTROL UNIT INTERNAL TEMPERATURE
TEO ENGINE OIL TEMPERATURE
Ti TITANIUM
TLA THROTTLE LEVER ANGLE (AIRBUS)
TLA THRUST LEVER ANGLE (BOEING)
TMC TORQUE MOTOR CURRENT
TPU TRANSIENT PROTECTION UNIT
TR TRANSFORMER RECTIFIER
TRA THROTTLE RESOLVER ANGLE (AIRBUS)
TRA THRUST RESOLVER ANGLE (BOEING)
TRAS THRUST REVERSER ACTUATION SYSTEM
TRDV THRUST REVERSER DIRECTIONAL VALVE
TRF TURBINE REAR FRAME
TRPV THRUST REVERSER PRESSURIZING VALVE
TRSOV THRUST REVERSER SHUT-OFF VALVE
TTL TRANSISTOR TRANSISTOR LOGIC

UTC UNIVERSAL TIME CONSTANT

VAC VOLTAGE, ALTERNATING CURRENT
VDC VOLTAGE, DIRECT CURRENT
VDT VARIABLE DIFFERENTIAL TRANSDUCER
VIB VIBRATION
VRT VARIABLE RESISTANCE TRANSDUCER
VSV VARIABLE STATOR VANE

WAI WING ANTI-ICE (AIRBUS)
WDM WATCHDOG MONITOR
Wf WEIGHT OF FUEL OR FUEL FLOW
WFM WEIGHT OF FUEL METERED
WOW WEIGHT ON WHEELS
WTAI WING THERMAL ANTI-ICING (BOEING)