Acceptable Methods, Techniques, and Practices—Aircraft Inspection and RepairAC 43.13-1B
Appendix 2
ACRONYMS AND ABBREVIATIONS
AC 43.13-1B: Acceptable Methods, Techniques, and Practices—Aircraft Inspection and Repair6 PagesPages 1 (App. 2)–6 (App. 2)Dated 9/8/98Change 1
Summary
What It Is
AC 43.13-1B contains methods, techniques, and practices acceptable to the FAA for inspections and minor repairs of nonpressurized areas of civil aircraft, unless the manufacturer's instructions recommend against the repair.
Why It Matters
Persons maintaining aircraft under 14 CFR part 43 use it; its repair data may serve as FAA-approved data for repairs when cited by chapter, page, and paragraph in block 8 of Form 337.
APPENDIX 2. ACRONYMS AND ABBREVIATIONS
The acronyms and abbreviations listed are some of many that are likely to be encountered by the aviation mechanic or technician involved in the maintenance of aircraft.
| 429 — ARINC 429 data bus standard |
| 629 — ARINC 629 data bus standard |
| A/D — analog/digital; Analog-to-Digital |
| A/D CONV — Analog-to-Digital Converter |
| A/L — autoland |
| AC — advisory circular |
| AC — alternating current |
| ACARS — Aircraft Communications Addressing and Reporting System |
| ACO — Aircraft Certification Office |
| AD — Airworthiness Directive |
| ADC — air-data computer |
| ADCP — ATC dual-control panel |
| ADEDS — Advanced Electronic Display System |
| ADF — automatic direction finder |
| ADI — Attitude-Director Indicator; Air Data Instrument |
| AFC — automatic frequency control |
| AFCS — automatic flight control system |
| AFDS — Autopilot Flight Director System |
| AIM — Aeronautical Information Manual |
| AIRCOM — Air/ground Communications |
| AM — amplitude modulation |
| amp — amperes |
| AMP or AMPL — amplifier |
| AMS — Aerospace Material Specification |
| AN — Army/Navy |
| AND — Army Navy Design |
| ANSI — American National Standards Institute |
| ANT — antenna |
| AP — autopilot |
| APB — auxiliary power breaker |
| APCU — auxiliary power control unit |
| APU — auxiliary power unit |
| ARINC — Aeronautical Radio, Inc. |
| ARNC IO — ARINC I/O Error |
| ARNC STP — ARNC I/O UART data strip error |
| ASTM — ASTM International |
| ATA — Air Transport Association |
| ATC — air traffic control |
| ATCT — ATC transponder |
| ATCTS — ATC transponder system |
| AUX — auxiliary |
| AVC — automatic volume control |
| AWG — American Wire Gauge |
| AWS — Automatic Weather Station |
| B/CU — battery/charger unit |
| BAT or BATT — battery |
| BCD — binary-coded decimal |
| BIT — binary digit; Built-in Test |
| BITE — built-in test equipment |
| BITS — bus interconnect transfer switch |
| BNR — Binary Numerical Reference; binary |
| BP — band-pass |
| BPCU — bus power control unit |
| BT — bus tie |
| BTB — bus tie breaker |
| BTC — before top center |
| BUS — electrical bus; 429 digital data bus |
| C.G. — center of gravity |
| CAGE — commercial and government entity code |
| CAWS — central aural warning system; caution and warning system |
| CB, C/B, or CKT/BKR — circuit breaker |
| CDI — course-deviation indicator |
| CDU — central display unit |
| CFC — carbon fiber composite |
| CFDS — centralized fault display system |
| CAC — caution advisory computer |
| CH or chan. — channel |
| CHGR — charger |
| CKT — circuit |
| CLK — clock |
| CLR — clear |
| CMCS — central maintenance computer system |
| CMPTR — computer |
| CO — carbon monoxide |
| COAX — coaxial |
| COP — copper |
| CP — control panel |
| CRT — cathode ray tube; circuit |
| CSE or CSEU — control system electronics unit |
| CSEUP — control system electronics unit panel |
| CT — Computed Tomography |
| CT — current transformer |
| CTN — caution |
| CU — control unit; copper |
| CVR — cockpit voice recorder |
| CW — continuous wave |
| D/A — digital-to-analog |
| DAC — digital-to-analog converter |
| DADC — digital air-data computer |
| DBT — dead bus tie |
| dc — direct current |
| DCDR — decoder |
| DDB — digital data bus |
| DEMOD — demodulator |
| DEMUX — demultiplexer |
| DER – Designated Engineering Representative |
| DFDR — digital flight data recorder |
| DG — directional gyro |
| DGTL — digital |
| DH — decision height |
| DISC SOL — disconnect solenoid |
| DISC — disconnect |
| DISTR — distribution |
| DMA — direct memory access |
| DMB — dead main bus |
| DMC — display management computer |
| DME — distance measuring equipment |
| DMEA — distance-measuring equipment antenna |
| DN — down |
| DU — display unit |
| E/E or E & E — electrical/electronic |
| E1-1 — first shelf, number 1 equipment rack |
| E2-2 — second shelf, number 2 equipment rack |
| EADF — electronic automatic direction finder |
| EADI — electronic attitude director indicator |
| EAROM — electrically alterable read-only memory |
| EC — EICAS computer |
| ECAM — electronic centralized aircraft monitoring |
| EDSP — EICAS display select panel |
| EDU — EICAS display unit |
| EEC — electronic engine control |
| EFI — electronic flight instrument |
| EFIS — electronic flight instrument system |
| EFISCP — EFIS Control Panel |
| EFISCU — EFIS comparator unit |
| EFISG EFIS — symbol generator |
| EFISRLS — EFIS remote light sensor |
| EHSI — electronic horizontal-situation indicator |
| EHSID — electronic horizontal-situation indicator display |
| EHSV — electrohydraulic servo value |
| EICAS — engine indicating and crew alerting system |
| ELCU — electrical load control unit |
| ELEC — electric; electronic |
| ELECT — electrical |
| ELEX — electronics; electrical |
| ELT — emergency locator transmitter |
| EMER GEN — emergency generator |
| EMF — electromotive force |
| EMFI — electromechanical flight instrument |
| EMI — electromagnetic interference |
| EP — external power |
| EP AVAIL — external power available |
| EPC — external power contactor |
| EPCS — electronic power control switch |
| EPROM — erasable programmable readonly memory |
| eV — electron volt |
| EXCTR — exciter |
| EXT PWR — external power |
| FAA — Federal Aviation Administration |
| FAA-PMA — Federal Aviation Administration Parts Manufacturer Approval |
| FM — frequency modulation |
| FM/CW — frequency modulation continuous wave |
| FMC — flight management computer |
| FMCD — flight management computer control display unit |
| FMCS — flight management computer systems |
| FMS — flight management system |
| FOD — foreign object damage |
| FREQ — frequency |
| FSEU — flap/slat electronic unit |
| FW or FWD — forward |
| G/S — glide slope |
| GAL or GALY — galley |
| GCR — generator control relay auxiliary contact |
| GCU — generator control unit |
| GEB — generator circuit breaker |
| GEN — generator |
| GLR — galley load relay |
| GMAW — Gas Metal Arc Welding |
| GMT — Greenwich mean time; coordinated Universal time |
| GND PWR — ground power |
| GND RET — ground return |
| GND SVCE — ground service |
| GND or GRD — ground |
| GPCU — ground power control unit |
| GPS — Global Positioning System |
| GPSW — gear opposition switch |
| GPU — ground power unit |
| GPW — ground proximity warning |
| GPWC — ground proximity warning computer |
| GPWS — ground proximity warning system |
| GSR — ground service relay |
| GSSR — ground service select relay |
| GSTR — ground service transfer relay |
| GTAW — gas tungsten arc welding |
| H/L — high/low |
| HEA — high-frequency radio antenna |
| HF (hf) — high frequency (3 to 30 MHz) |
| HFCP — high-frequency radio control panel |
| HI Z — high impedance |
| Hz — hertz |
| I.D. — inner diameter |
| I/O — input/output |
| IAPS — integrated avionics processor system |
| IAS — indicated airspeed |
| IDG — integrated drive generator |
| IF — intermediate frequency |
| IFR — instrument flight rules |
| IGN — ignition |
| IIS — integrated instrument system |
| ILS — instrument landing system |
| INDL — indicator light |
| INST — instrument |
| INSTR — instrument |
| INTCON — interconnect |
| INTEC — interface |
| INTER — interrogation |
| INTPH — interphone |
| INV — inverter |
| IR — ILS receiver |
| kHz — kilohertz |
| KSI — thousands of pounds per square inch |
| kV — kilovolts |
| kVA — kilovolt-amperes |
| kVAR — kilovoltampere reactive |
| L-Band — radio frequency band (390 to 1550 MHz) |
| LCD — liquid crystal display |
| LD — load |
| LED — light-emitting diode |
| lf — low frequency (30 to 300 kHz) |
| LOZ — low impedance |
| LOC — Localizer |
| LOX – liquid oxygen |
| LRU — line replaceable unit |
| LS — loudspeaker |
| LSB — lower sideband |
| LSPTM — limit switch position transmitter module |
| LT — light |
| LTS — lights |
| MAC — mean aerodynamic chord |
| MAN/ELEC — manual/electric |
| MBA — marker-beacon antenna |
| MCDP — maintenance control and display panel |
| MCDU — multipurpose control and display unit |
| MDE — modern digital electronics |
| MEC — main equipment center; main engine control |
| meg or mega — million |
| MEK — methylethylketone |
| MEM — memory |
| METO — maximum except-takeoff |
| MF — (mf) medium frequency (300 kHz to 3 MHz) |
| MHz — megahertz |
| MIC — microphone |
| MICRO-P — microprocessor |
| MIG — Metal Inert Gas |
| MILLI — one-thousandth (0.001) |
| MKR BCN — marker beacon |
| MS — Military Standard |
| MSDS — Material Safety Data Sheets |
| MSEC — (ms) milliseconds |
| MSG — message |
| MTBF — mean time between failure |
| MUX — multiplexer |
| mV — millivolts |
| NAS — National Aerospace Standard |
| NAV — navigation |
| NC — normally closed; not connected; no connection |
| NDB — nondirectional beacon |
| NDI — Nondestructive Inspection |
| NEG — negative |
| nsec (ns) — nanoseconds |
| NTSB — National Transportation Safety Board |
| NVM — nonvolatile memory |
| OAM — original aircraft manufacturer |
| OBS — omni bearing selection |
| OC — over-current |
| OEM — Original Equipment Manufacturer |
| OF — over-frequency |
| OVV or OV — overvoltage |
| OVVCO or OVCO — overvoltage cutout |
| P-S — parallel to series |
| PA — passenger address; power amplifier |
| PARA/SER — parallel to serial |
| PCU — passenger control unit; power control unit |
| PMA — Parts Manufacturer Approval |
| PMG — permanent-magnet generator |
| POS — positive |
| POT — potentiometer; plan of test |
| PR — power relay |
| PRL — parallel |
| PROM — programmable read-only memory |
| PROX — proximity |
| PSEU — proximity switch electronic unit |
| psi — pounds per square inch |
| PWR — power |
| PWR SPLY — power supply |
| QPL — Qualified Products List |
| QTY — quantity |
| r-t — receiver-transmitter |
| RA — radio altimeter; radio altitude |
| RAD — radio |
| RAIND — radio altimeter indicator |
| RAM — Random-Access Memory |
| RART — radio altimeter receiver-transmitter |
| RAT — ram air turbine |
| RCCB — remote-control circuit breaker |
| RCL — recall |
| RCVR — receiver |
| RCVR/XMTR — receiver/transmitter |
| RDMI — radio distance magnetic indicator |
| RF (rf) — radio frequency |
| RFI — radio-frequency interference |
| RLS — remote light sensor |
| RMI — radio magnetic indicator |
| rpm — revolutions per minute |
| RTV — room temperature vulcanizing |
| SAE — SAE International |
| SAT — static air temperature |
| SATCOM — satellite communications |
| SCR — silicon-controlled rectifier |
| SDI — source destination identifier |
| SELCAL — selective calling system |
| SER DL — serial data link |
| SG — symbol generator |
| SITA — Societe International de Télécommunications Aeronautiques |
| SMAW — Shielded Metal Arc Welding |
| SMD — surface mounted device |
| SNR — signal-to-noise ratio |
| SOL — solenoid |
| SOLV — solenoid valve |
| SOM — start of message |
| SOT — start of transmission |
| SPKR — speaker |
| SPR — software problem report |
| SQL — squelch |
| SRM – Structural Repair Manual |
| SSB — single sideband |
| SSID — Supplemental Structural Inspection Documents |
| SSM — sign status matrix |
| ST — synchro transmitter |
| STAT INV — static inverter |
| STBY — standby |
| STC — Supplemental Type Certificate |
| SW — switch |
| SYM GEN — symbol generator |
| T-R — transformer-rectifier |
| TAT — true air temperature |
| TBDP — tie bus differential protection |
| TC — type certificate |
| TCAS — Traffic Alert and Collision Avoidance System |
| TCDS — Type Certificate Data Sheet |
| TDC — top dead center |
| TFR — transfer |
| TIG — tungsten inert gas |
| TMC — thrust management computer |
| TMS — Terminal Marking Sleeve |
| TMS — thrust management system |
| TMSP — thrust mode select panel |
| TRU — transformer-rectifier unit |
| TSO — Technical Standard Order |
| TXPDR — transponder |
| μ — micro |
| UBR — utility bus relay |
| UF — under-frequency |
| UHF — ultrahigh frequency (300 MHz to 3 GHz) |
| UNDF — under-frequency |
| UNDV — under-voltage |
| US — under-speed |
| USB (us) — upper sideband |
| μsec — microseconds |
| UV — ultraviolet |
| UV — Under Voltage |
| V ac, Vac, or VAC — volts alternating current |
| V dc, Vdc, or VDC — volts direct current |
| V — volts; voltage; vertical; valve |
| VA — volt-ampere |
| VAR — volt-ampere reactive |
| VFR — visual flight rules |
| VHF (vhf) — very high frequency (30 to 300 MHz) |
| VLSI — very large-scale integration |
| VOR — VHF omni-directional range |
| VORTAC — VOR Tactical Air Navigation |
| VR — voltage regulator |
| VRMS — volts root means square |
| W — watts |
| WARN — warning |
| WCP — weather radar control panel |
| WEA — weather |
| WEU — warning electronics unit power supply |
| WPT — waypoint |
| WX (WXR) — weather radar |
| XCVR — transceiver |
| XDCR — transducer |
| XFMR — transformer |
| XFR — transfer |
| XMIT — transmit |
| XMTR — transmitter |
| XPDR — transponder |