DH  Decision Height
DIA  Diameter
DME  Distance Measuring Equipment
DMU  Data Management Unit
ECAM  Electronic Centralized Aircraft 
Monitoring
ECB  Electronic Control Box
EEC  Engine Electronic Controller
EFCC  Electronic Flight Control Computer
EFIS  Electronic Flight Instrument System
EGT  Exhaust Gas Temperature
ELAC  Elevator Aileron Computer
EPR  Engine Pressure Ratio
EROPS  Extended Range Operations
ETOPS  Extended-Range Twin Engine 
Operations
F/O  First Officer
FAA  Federal Aviation Administration
FAC  Flight Augmentation Computer
FADEC  Full Authority Digital Engine 
Control
FAR  Federal Aviation Regulation
FCC  Flight Control Computer

FCU  Flight Control Unit
FD  Flight Director
FH  Flight Hours
FIN  Functional Item Number