Appendix 2 EMER GEN — emergency generator GND or GRD — ground EMF — electromotive force GPCU — ground power control unit EMFI — electromechanical flight instrument GPS — Global Positioning System EMI — electromagnetic interference GPSW — gear opposition switch EP — external power GPU — ground power unit EP AVAIL — external power available GPW — ground proximity warning EPC — external power contactor GPWC — ground proximity warning computer EPCS — electronic power control switch GPWS — ground proximity warning system EPROM — erasable programmable readonly memory GSR — ground service relay eV — electron volt GSSR — ground service select relay EXCTR — exciter GSTR — ground service transfer relay EXT PWR — external power GTAW — gas tungsten arc welding FAA — Federal Aviation Administration H/L — high/low FAA-PMA — Federal Aviation Administration Parts Manufacturer Approval HEA — high-frequency radio antenna FM — frequency modulation HF (hf) — high frequency (3 to 30 MHz) FM/CW — frequency modulation continuous wave HFCP — high-frequency radio control panel FMC — flight management computer HI Z — high impedance FMCD — flight management computer control display unit Hz — hertz FMCS — flight management computer systems I.D. — inner diameter FMS — flight management system I/O — input/output FOD — foreign object damage IAPS — integrated avionics processor system FREQ — frequency IAS — indicated airspeed FSEU — flap/slat electronic unit IDG — integrated drive generator FW or FWD — forward IF — intermediate frequency G/S — glide slope IFR — instrument flight rules GAL or GALY — galley IGN — ignition GCR — generator control relay auxiliary contact IIS — integrated instrument system GCU — generator control unit ILS — instrument landing system GEB — generator circuit breaker INDL — indicator light GEN — generator INST — instrument GLR — galley load relay INSTR — instrument GMAW — Gas Metal Arc Welding INTCON — interconnect GMT — Greenwich mean time; coordinated Universal time INTEC — interface GND PWR — ground power INTER — interrogation GND RET — ground return INTPH — interphone GND SVCE — ground service INV — inverter
Appendix 2 IR — ILS receiver MILLI — one-thousandth (0.001) kHz — kilohertz MKR BCN — marker beacon KSI — thousands of pounds per square inch MS — Military Standard kV — kilovolts MSDS — Material Safety Data Sheets kVA — kilovolt-amperes MSEC — (ms) milliseconds kVAR — kilovoltampere reactive MSG — message L-Band — radio frequency band (390 to 1550 MHz) MTBF — mean time between failure LCD — liquid crystal display MUX — multiplexer LD — load mV — millivolts LED — light-emitting diode NAS — National Aerospace Standard lf — low frequency (30 to 300 kHz) NAV — navigation LOZ — low impedance NC — normally closed; not connected; no connection LOC — Localizer NDB — nondirectional beacon LOX – liquid oxygen NDI — Nondestructive Inspection LRU — line replaceable unit NEG — negative LS — loudspeaker nsec (ns) — nanoseconds LSB — lower sideband NTSB — National Transportation Safety Board LSPTM — limit switch position transmitter module NVM — nonvolatile memory LT — light OAM — original aircraft manufacturer LTS — lights OBS — omni bearing selection MAC — mean aerodynamic chord OC — over-current MAN/ELEC — manual/electric OEM — Original Equipment Manufacturer MBA — marker-beacon antenna OF — over-frequency MCDP — maintenance control and display panel OVV or OV — overvoltage MCDU — multipurpose control and display unit OVVCO or OVCO — overvoltage cutout MDE — modern digital electronics P-S — parallel to series MEC — main equipment center; main engine control PA — passenger address; power amplifier meg or mega — million PARA/SER — parallel to serial MEK — methylethylketone PCU — passenger control unit; power control unit MEM — memory PMA — Parts Manufacturer Approval METO — maximum except-takeoff PMG — permanent-magnet generator MF — (mf) medium frequency (300 kHz to 3 MHz) POS — positive MHz — megahertz POT — potentiometer; plan of test MIC — microphone PR — power relay MICRO-P — microprocessor PRL — parallel MIG — Metal Inert Gas PROM — programmable read-only memory
Appendix 2 PROX — proximity SOT — start of transmission PSEU — proximity switch electronic unit SPKR — speaker psi — pounds per square inch SPR — software problem report PWR — power SQL — squelch PWR SPLY — power supply SRM – Structural Repair Manual QPL — Qualified Products List SSB — single sideband QTY — quantity SSID — Supplemental Structural Inspection Documents r-t — receiver-transmitter SSM — sign status matrix RA — radio altimeter; radio altitude ST — synchro transmitter RAD — radio STAT INV — static inverter RAIND — radio altimeter indicator STBY — standby RAM — Random-Access Memory STC — Supplemental Type Certificate RART — radio altimeter receiver-transmitter SW — switch RAT — ram air turbine SYM GEN — symbol generator RCCB — remote-control circuit breaker T-R — transformer-rectifier RCL — recall TAT — true air temperature RCVR — receiver TBDP — tie bus differential protection RCVR/XMTR — receiver/transmitter TC — type certificate RDMI — radio distance magnetic indicator TCAS — Traffic Alert and Collision Avoidance System RF (rf) — radio frequency TCDS — Type Certificate Data Sheet RFI — radio-frequency interference TDC — top dead center RLS — remote light sensor TFR — transfer RMI — radio magnetic indicator TIG — tungsten inert gas rpm — revolutions per minute TMC — thrust management computer RTV — room temperature vulcanizing TMS — Terminal Marking Sleeve SAE — SAE International TMS — thrust management system SAT — static air temperature TMSP — thrust mode select panel SATCOM — satellite communications TRU — transformer-rectifier unit SCR — silicon-controlled rectifier TSO — Technical Standard Order SDI — source destination identifier TXPDR — transponder SELCAL — selective calling system µ — micro SER DL — serial data link UBR — utility bus relay SG — symbol generator UF — under-frequency SITA — Societe International de Télécommunications Aeronautiques UHF — ultrahigh frequency (300 MHz to 3 GHz) SMAW — Shielded Metal Arc Welding UNDF — under-frequency SMD — surface mounted device UNDV — under-voltage SNR — signal-to-noise ratio US — under-speed SOL — solenoid USB (us) — upper sideband SOLV — solenoid valve µsec — microseconds SOM — start of message UV — ultraviolet
Appendix 2 UV — Under Voltage WARN — warning V ac, Vac, or VAC — volts alternating current WCP — weather radar control panel V dc, Vdc, or VDC — volts direct current WEA — weather V — volts; voltage; vertical; valve WEU — warning electronics unit power supply VA — volt-ampere WPT — waypoint VAR — volt-ampere reactive WX (WXR) — weather radar VFR — visual flight rules XCVR — transceiver VHF (vhf) — very high frequency (30 to 300 MHz) XDCR — transducer VLSI — very large-scale integration XFMR — transformer VOR — VHF omni-directional range XFR — transfer VORTAC — VOR Tactical Air Navigation XMIT — transmit VR — voltage regulator XMTR — transmitter VRMS — volts root means square XPDR — transponder W — watts
Appendix 3 APPENDIX 3. METRIC-BASED PREFIXES AND POWERS OF 10 Atto (a) = quintillionth of = 10-18 times Femto (f) = quadrillionth of = 10-15 times Pico (p), or (µµ) = trillionth of = 10-12 times Nano (n), or (mµ) = billionth of = 10-9 times Micro (µ) = millionth of = 10-6 times Milli (m) = thousandth of = 10-3 times Centi (c) = hundredth of = 10-2 times Deci (d) = tenth of = 10-1 times unity = 100 = 1 Deka (da) = ten times = 10 times Hecto (h) = hundred times = 102 times Kilo (k) = thousand times = 103 times Mega (M) = million times = 106 times Giga (G), or (kM) = billion times = 109 times Tera (T) = trillion times = 1012 times
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