GPWS  Ground Proximity Warning System
GS  Ground Speed
HF  High Frequency
HSI  Horizontal Situation Indicator
HUD  Head Up Display
HZ  Hertz
I/O  Input/Output
IAE  International Aero Engines
IAS  Indicated Airspeed
IC  Integrated Circuit
IGV  Inlet Guide Vane
ILS  Instrument Landing System
IN  Inch
INOP  Inoperative
INS  Inertial Navigation System
IRS  Inertial Reference System
JAA  Joint Aviation Authorities
LAT  Latitude
LCD  Liquid Crystal Display
LH  Left Hand
LOC  Localizer
LONG  Longitude
LVDT  Linear Variable Differential 
Transducer

MAC  Mean Aerodynamic Chord
MAINT  Maintenance
MCDU  Multipurpose Control & Display Unit
MCDU  Multiple Control Display Unit
MEL  Minimum Equipment List
MFA  Memorized Fault Announciator
MISC  Miscellaneous
MLG  Main Landing Gear
MPD  Maintenance Planning Document
MRB  Maintenance Review Board
MRBR  Maintenance Review Board Report
MRS  Maintenance Requirement System