Flight Control Secondary Computer
FCTN
Function FCU
Flight Control Unit FCV
Flow Control Valve FD
Flight Director
FDBK
Feedback
FDIU
Flight Data Interface Unit FDU
Fire Detection Unit FE
Flight Envelope FF
Fuel Flow FG
Flight Guidance
FIDS
Fault Isolation and Detection System
FIFO
First Input/First Output FIG
Figure FIN
Functional Item Number FIR
Full Indicator Reading FL
Flight Level
FLEX
Flexible FLP Flap FLT
Flight FM
Flight Management
FMA
Flight Mode Annunciator
FMC
Flight Management Computer
FMGC
Flight Management and Guidance Computer
FMGS
Flight Management and Guidance System FMS
Flight Management System
FMU
Fuel Metering Unit
FMV
Fuel Metering Valve FO
Fully Open FOB
Fuel On Board FOD
Foreign Object Damage FPA
Flight Path Angle
FPEEPMS
Floor Proximity Emergency Escape Path Marking System
FPPU
Feedback Position Pick-off Unit FPV
Flight Path Vector
FQ
Fuel Quantity FQI
Fuel Quantity Indicating/Indication/Indicator FR
Frame
FREQ
Frequency FRU
Frequency Reference Unit FRV
Fuel Return Valve FSB
Fasten Seat Belts FW
Failure Warning
FWC
Flight Warning Computer
FWD
Forward
FWS
Flight Warning System G
Green G/S
Glide Slope GA
Go-Around
GALY
GAPCU
Ground Auxiliary Power Control Unit
Galley
GCR
Generator Control Relay
GCU
Generator Control Unit
GEN
Generator GLC
Generator Line Contactor GLR
Generator Line Relay
GMT
Greenwich Mean Time