| Acronym |
Definition |
| A & E |
Airframe and Engine |
| AAI |
Angle of Approach Indicator |
| A&P |
Airframe and Power Plant |
| AAS |
Advanced Automation System |
| A/B |
Afterburner |
| A/C |
Air-Conditioning |
| ACARS |
Aircraft Communications Addressing and Reporting System |
| ACAS |
Airborne Collision Avoidance System |
| acft |
Aircraft |
| actuat |
Actuating |
| AD |
Airworthiness Directive |
| ADF |
Automatic Direction Finder |
| ADI |
Attitude Director Indicator |
| ADS |
Air Data System |
| A/F |
Air-to-Fuel Ratio |
| AF&E |
Airframe and Engine |
| AFM |
Aircraft Flight Manual |
| AFR |
Actual Fuel Remaining |
| AGB |
Accessory Gearbox |
| AH |
Artificial Horizon |
| AI |
Attitude Indicator |
| AIT |
Auto Ignition Temperature |
| alky |
Alcohol |
| ALSTG |
Altimeter Setting |
| alt |
Altimeter |
| AM |
Amplitude Modulation |
| amp |
Ampere |
| AMT |
Aviation Maintenance Technician |
| ant |
Antenna |
| anten |
Antenna |
| AOA |
Angle of Attack |
| AP |
Audio Panel |
| AP |
Autopilot |
| A/P |
Autopilot |
| APFD |
Autopilot Flight Director |
| APU |
Auxiliary Power Unit |
| ARFF |
Aircraft Rescue Firefighting Equipment |
| ASI |
Airspeed Indicator |
| ATE |
Automatic Test Equipment |
| ATP |
Air Transport Pilot |
| aux |
Auxiliary |
| aw |
Airworthiness |
| AWR |
Airborne Weather Radar |
| B |
Battery |
| bag |
Baggage |
| bat |
Battery |
| bcn |
Beacon |
| bdcst |
Broadcast |
| BFO |
Beat Frequency Oscillator |
| BGI |
Basic Ground Instructor |
| BHP |
Brake Horsepower |
| BITE |
Built-in Test Equipment |
| blkd |
Bulkhead |
| blks |
Blocks |
| BMEP |
Brake Mean Effective Pressure |
| BOW |
Basid Operating Weight |
| BPR |
Bypass Ratio |
| BSFC |
Brake Specific Fuel Consumption |
| BVOR |
Broadcast VOR |
| CAFE |
Corporate Average Fuel Economy |
| carb |
Carberetor |
| CAS |
Calibrated Airspeed |
| CAS |
Collision Avoidance System |
| CAS |
Computed Airspeed |
| CAT |
Carburetor Air Temperature |
| CB |
Circuit Breaker |
| CC |
Courtesy Car |
| CDI |
Course Deviation Indicator |
| CDP |
Compressor Discharge Pressure |
| CDT |
Compressor Discharge Temperature |
| CDU |
Control Display Unit |
| Cec |
Ceconite (fabric) |
| Cent. |
"Century (III, etc.)" |
| CFCF |
Central Flow Control Function |
| CFI |
Certified Flight Instructor |
| CFM |
Cubic Feet per Minute |
| Ch |
Channel |
| CHT |
Cylinder Head Temperature |
| CIP |
Compressor Inlet Pressure |
| CIT |
Combustor Inlet Temperature |
| CIT |
Compressor Inlet Temperature |
| CKI |
Certified Known Icing |
| Com |
Communications |
| COMLO |
Compass Locator |
| comp |
Composite |
| compr |
Compression |
| Cont |
Continental (engine) |
| cont |
Control(s) |
| CPR |
Compressor Discharge Ratio (Pressure) |
| CPU |
Central Processing Unit |
| C/R |
Counter Rotating |
| CRM |
Cockpit Resource Management |
| CRM |
Crew Resource Management |
| CRS |
Certified Repair Station |
| CRT |
Cathode Ray Tube |
| CSFC |
Cruise Specific Fuel Consumption |
| CT |
Carburetor Temperature |
| cyl |
Cylinder |
| D |
Dual Wheel (landing gear) |
| DDT |
Double Dual-Tandem (landing gear) |
| DF |
Direction Finder |
| DG |
Directional Gyro |
| DME |
Distance Measuring Equipment |
| DME/P |
Precision Distance Measuring Equipment |
| DRC |
Direct Read Compass |
| DT |
Dual-Tandem (landing gear) |
| E/S |
Engine Speed |
| EADI |
Electronic Attitude Direction Indicator |
| ECS |
Environmental Control System |
| ECU |
Electronic Control Unit |
| EEC |
Electronic Engine Control |
| EFIS |
Electronic Flight Instrument System |
| EGT |
Exhaust Gas Temperature |
| EHSI |
Electronic Horizontal Situation Indicator |
| EICAS |
Engine Indication & Crew Alert System |
| elec |
Electric |
| ELT |
Emergency Locator Transmitter |
| enc |
Encoder(ing) |
| eng |
Engine(s) |
| EOBT |
Estimated Off-Block Time |
| EOW |
Empty Operating Weight |
| EPR |
Engine Pressure Ratio |
| EPU |
Emergency Power Unit |
| ESHP |
Equivalent Shaft Horsepower |
| EVC |
Engine Vane Control |
| exc |
Excellent |
| exec |
Executive |
| exh |
Exhaust |
| F/A |
Fuel-to-Air Ratio |
| F/D |
Flight Director |
| fac rmfd |
Factory remanufactured |
| FBW |
Fly by Wire |
| FCU |
Fuel Control Unit |
| FD |
Flight Director(y) |
| FF |
Fuel Flow |
| FG |
Fixed Gear |
| FGP |
Full Gyro Panel |
| FI |
Fuel Injected |
| FIA |
Flight Instructor- Airplane |
| FREM |
Factory Remanufactured |
| FWF |
Firewall Forward |
| G/S |
Glide Slope |
| G |
Generator |
| GCESS |
Ground Clearance Energy Saver Switch |
| gen |
Generator |
| GNS |
Global Navigation System |
| GPH |
Gallons per Hour |
| GPM |
Gallons per Minute |
| GPS |
Global Positioning System |
| GPU |
Ground Power Unit |
| GPWS |
Ground Proximity Warning System |
| GR |
Glide Ratio |
| GS |
Glidescope |
| GS |
Ground Speed |
| GSP |
Ground Service Plug |
| gyro |
Gyroscope |
| HC |
Heavy Case |
| HDF |
High Frequency Direction Finder |
| HF |
High Frequency |
| HP |
Heated Pilot |
| HP |
High Performance |
| HP |
Horsepower |
| HP |
Hot Prop |
| HPC |
High Pressure Compressor |
| HPT |
High Pressure Turbine |
| HSI |
Horizontal Situation Indicator |
| HSI |
Hot Section Inspection |
| HUD |
Head Up Display |
| HVOR |
High VOR |
| I |
Injected |
| IBN |
Identification Beacon |
| IC |
Integrated Circuits |
| IC |
Internal Combustion |
| ICO |
Idle Cutoff |
| IFR |
Instrument Flight Rating |
| ILS |
Instrument Landing System |
| inop |
Inoperative |
| inst |
Instrument(s) |
| int |
Interior |
| inter |
Interior |
| IRAN |
Inspect. Repair As Necessary |
| ITC |
Investment Tax Credit |
| JATO |
Jet Assisted Take-Off |
| K |
Knot |
| K-Ice |
Known Icing |
| kt |
Knot(s) |
| LCD |
Liquid Crystal Display |
| ldg |
Landing |
| LE |
Left Engine |
| LED |
Light Emitting Diode |
| LMB |
Light Marker Beacon |
| LOC |
Localizer |
| Loran |
Long Range Navigation |
| LR |
Long Range |
| lrn |
Loran |
| LRNAV |
Long-Range Navigation |
| LRR |
Long-Range Radar |
| LRT |
Long Range Tanks |
| Lyc |
Lycoming (engine) |
| MAP |
Manifold Absolute Pressure |
| MB |
Marker Beacon |
| MDH |
Major Damage History |
| ME |
Multi-Engine |
| MFD |
Multifunctional Display |
| MP |
Manifold Pressure |
| MSP |
Maintenance Service Plan |
| nav |
Navigation |
| ND |
No Damage |
| NDB |
Nondirectional Beacon |
| NDH |
No Damage History |
| NM |
Nautical Miles |
| Nav |
Navigation Radio Receiver |
| OAT |
Outside Air Temperature |
| OBS |
Omnibearing Selector |
| OH |
Overhaul |
| oxy |
Oxygen |
| P |
Piston |
| P |
Pitot |
| P&W |
Pratt & Whitney (engine manufacturer) |
| PBH |
Power by the hour |
| PC |
Positive Control |
| PEP |
Piper External Power |
| PET |
Piper Electric Trim |
| pkg |
Package |
| POH |
Pilots Operating Handbook |
| POM |
Pilots Operating Manual |
| PTT |
Push to Talk |
| R |
Radar |
| RA |
Radio Altimeter |
| RAI |
Runway Alignment Indicator |
| RB |
Rotating Beacon |
| RC |
Rate of Climb |
| rcvr |
Receiver |
| RDF |
Radio Direction Finder |
| RE |
Right Engine |
| recip |
Reciprocating |
| retr |
Retractable |
| RFM |
Rotorcraft Flight Manual |
| RG |
Retractable Gear |
| RMI |
Radio Magnetic Indicator |
| RNAV |
Area Navigation |
| S/N |
Serial Number |
| S |
Strobe(s) |
| SB's |
Service Bulletins |
| SCMOH |
Since Chrome Major Overhaul |
| SCTOH |
Since Chrome Top Overhaul |
| SE |
Single Engine |
| SECRA |
Secondary Radar |
| SFRMN |
Since Factory Remanufactured |
| SHP |
Shaft Horsepower |
| SHS |
Since Hot Section |
| SI |
Spark Ignited |
| SIT |
Self-Ignition Temperature |
| SMOH |
Since Major Overhaul |
| SN |
Serial Number |
| snd proof |
Sound proofing |
| SNEW |
Since New |
| SOH |
Since Overhaul |
| SPOH |
Since Prop Overhaul |
| STC |
Supplemental Type Certificate |
| STOH |
Since Top Overhaul |
| STOL |
Short Take-Off and Landing |
| STOP |
Since Top Overhaul |
| surf |
Surface(s) |
| SW |
Stall Warning |
| T |
Turboprop |
| T&B |
Turn and Bank |
| tach |
Tachometer |
| TBO |
Time Between Overhaul |
| TC |
Turbocharger |
| TC |
Type Certificate |
| TCA |
Terminal Control Area |
| TET |
Turbine Exhaust Temperature |
| T/F |
Turbofan |
| TGT |
Turbine Gas Temperature |
| THP |
Thrust Horsepower |
| TIP |
Turbine Inlet Pressure |
| TIT |
Turbine Inlet Temperature |
| T/J |
Turbojet |
| TOP |
Turbine Outlet Pressure |
| TOT |
Turbine Outlet Temperature |
| T/P |
Transponder |
| T/S |
Turboshaft |
| TT |
Total Time |
| TTAE |
Total Time Aircraft Engine |
| TTAF |
Total Time Aircraft Frame |
| TTSN |
Total Time Since New |
| TW |
Tail wheel |
| txp |
Transponder |
| txpdr |
Transponder |
| UHF |
Ultra High Frequency |
| vac |
Vacuum |
| VHF |
Very High Frequency |
| VI |
Viscosity Index |
| VLF |
Very Low Frequency |
| VOR |
VHF Omnidirectional Radio Range |
| VOR/DME |
Collocated VOR and Distance Measuring Equipment (DME) Navigational Aids |
| VR |
Voltage Regulator |
| w/ |
With |
| w/o |
Without |
| WAC |
With Approved Credit |
| W/S |
Windshield |
| xpdr |
Transponder |
| xpnd |
Transponder |
| xpndr |
Transponder |
