A&P: Airframe and Powerplant
AC or A/C: Air Conditioning
AD, AD'S or AD's: Airworthiness Directives (Maintenance or Mods ordered by FAA)
ADF: Automatic Direction Finder
AFIS: Airborne Flight Information System
AI: Attitude Indicator
AP: Autopilot OR Audio Panel
ANNUAL: Mandatory inspection of airframe and engine (every 12 months)
AP/FD: Autopilot/Flight Director
AUX FUEL: Auxiliary Fuel Tank(s)
BOOTS: Inflatable device on leading edge of wing and/or tail (ice removal)
CAMP: Computerized Aircraft Maintenance Program
CDI: Course Deviation Indicator
CHT: Cylinder Head Temperature
COM or COMS: Radio Communication(s) device(s)
CONVENTIONAL GEAR: 2 main wheels & 1 tail wheel
C/R: Counter Rotating
CT or C/T: Carburetor Temperature
CYCLES: Relates to turbine engine(s). The "CYCLE" begins with turbine start up and ends with turbine shutdown
DE-ICE or D/ICE: De-Icing system installed (determine where the system is located and which parts of the aircraft it functions on ("Full" = wings, tail, prop, and windshield)
DF or D/F: Direction Finder
DG or D/G: Direction Gyro
DME: Distance Measuring Equipment
EFIS: Electronic Flight Instrument System
EGT: Exhaust Gas Temperature
ELT: Emergency Locator Transmitter
ENC: Encoder
FD or F/D: Flight Director
FGP or FULL PANEL: Full Gyro Panel (necessary for instrument flight)
FWF: Firewall Forward
GNS: Global Navigation System
GPS: Global Positioning System
GS or G/S: Glide Slope
GSP: Ground Service Plug
HC or H/C: Heavy Case
HF or H/F: High Frequency Radio
HOT PROP: De-icing equipped propeller
HP: Heated Pitot (or could stand for "horsepower")
hp: Horsepower (also could stand for "heated pitot")
HIS: Horizontal Situation Indicator
IFR: Instrument Flight Rules
ILS: Instrument Landing System
IRAN: Inspection Repair As Necessary
ITC: Investment Tax Credit
K-ICE: Certified for flight into icing conditions
KNOWN ICE or KNOWN ICING: Certified for flight into icing conditions
LE or L/E: Left Engine (RE or R/E is Right Engine)
LMB: Light Marker Beacon
LOC: Localizer
LR or L/R: Long Range
LRT: Long Rang Tanks
MB: Marker Beacon
MDH: Major Damage History
MID-TIME: Middle 3rd of recommended engine TBO (Time Between Overhaul)
MLS: Microwave Landing System
MP or M/P: Manifold Pressure
MSP: Maintenance Service Program
NAV: Navigation Radio(s)
NAV/COM = Navigation & Communication Radio(s)
NDH: No Damage History
NM: Nautical Miles
OAT: Outside Air Temperature
OH: Overhaul
OXY: Oxygen system (determine if for crew only or passengers and crew)
P&I: Paint and Interior (For example: "New P&I")
PBH: Power-By-Hour [(refers to maintenance program(s)]
PC or P/C: Positive Control
PET: Piper Electric Trim
PMA: Parts Manufacturer Approval
RB or R/B: Rotating Beacon
RC or R/C: Rate of Climb
RDF: Radio Direction Finder
RDR/RADAR: On-board weather/radar
RE = Right Engine (LE or L/E is Left Engine)
RG or RLG: Retractable (Landing) Gear
RMI: Radio Magnetic Indicator
RNAV: Area Navigation
SBS or SB'S SB's: Service Bulletin (Maintenance or mod ordered by the manufacturer)
SCMOH: Since Chrome Major Overhaul
SCORE: Since Core Inspection (Turbine reference)
SFRM: Since Factory Remanufacture
SHOT: Since Hot Section Inspection (Turbine reference)
SHP: Shaft Horsepower (Turbine reference)
SHS or SHSI: Since Hot Section Inspection (Turbine reference)
SLAVED COMPASS: North-seeking compass system
SMPI: Since Major Periodic Inspection (Turbine reference)
SMOH: Since Major Overhaul [engine (time) reference]
SN or S/N: Serial Number
SOH: Since Overhaul [refers to time and mainly with powerplant(s)]
SPOH: Since Propeller Overhaul
STC: Supplemental Type Certificate
STOH: Since Top Overhaul
STOL: Short Takeoff and Landing
STOP: Since Top Overhaul (reference to engines)
TBO: Time Between Overhaul
TCAS or T-CAS: Traffic Collision & Alert System
TRI or TRI-GEAR: Tri-cycle style landing gear (has single nose wheel)
TRS, TR'S or TR's: Thrust Reverser(s)
TSO: Time Since Overhaul
TT: Total Time
TTAE or TTA&E: Total Time on Airframe & Engine(s)
TTAF: Total Time on Airframe
TTSN: Total Time Since New
TURBOPROP or TURBO PROP: Turbine Engine that Drives Propeller'ed Aircraft
TXP or XPDR: Transponder
UHF: Ultra High Frequency
VFR: Visual Flight Rules (Usually indicated that aircraft is not IFR capable)
VHF: Very High Frequency
VLF: Very Low Frequency
VOR: VHF Omni-directional Radio Range
XPDR or TXP: Transponder