FL  (1) Foot Lambert 
(2) Flight Level (as in FL410). This terminology is 
used to describe aircraft attitude when the altimeter 
is set at QNE. 
FLCH  Flight Level Change 
FLIR  Forward Looking Infra-red Radiometer 
FLOPAC  IATA Flight Operations Advisory Sub-Committee 
FLPRN  Flaperon 
FLRE  Flare 
FLT  Flight 
FLT CTRL  Flight Control 
FLT INST  Flight Instrument 
FLW  Forward Looking Windshear Radar 
FM  Frequency Modulation 
FMA  Flight Mode Annunciator 
FMC  (1) Flight Management Computer (FMCS) 
(2) Flight Director Control (FD) 
FMCF  Flight Management Computer Function 
FMCS  Flight Management Computer System 
FMCW  Frequency-Modulated Continuous Wave 
FMEA  Failure Mode and Effects Analysis 
FMP  Flight Mode Panel 
FMS  Flight Management System 
FMSG  ICAO’s Frequency Management Study Group 
FMU  Fuel Metering Unit 
FNS  FAA Nav Sat 
F/O  (1) First Officer 
(2) Fuel/Oil Cooler 
FOC  (1) Full Operational Capability 
(2) Fuel/Oil Cooler 

FOM  Figure of Merit 
FPA  Flight Path Angle 
FPAC  Flight Path Acceleration 
FPC  Flight Profile Comparator 
FPGA  Field Programmable Gate Array 
FPM  Feet Per Minute 
FPV  Flight Path Vector 
FQIS  Fuel Quantity Indicating System 
FQPU  Fuel Quantity Processor Unit 
Framing  A pulse that is used to mark the beginning or end of