FD  (.1.).Final.Data.. (.2.).Flight.Director.. (.3.).Flight.Dynamics.. (.4.).Forward.Display
FDAF Flight Data Acquisition Function FDAU Flight Data Acquisition Unit FDB Flight.Plan.Data.Bank FDE (.1.).Flight.Detection.Exclusion..
(.2.).Flight.Deck.Enhancement
FDDI  Fiber.Distributed.Data.Interface
FDEP  Flight.Data.Entry.Panel
FDH  Flight.Deck.Handset
FDI  Fault.Detection.and.Isolation
FDIO  Flight Data Input/Output
FDM  Frequency Division Multiplex. A system where the
messages.are.transmitted.over.a.common.path.
by employing a different frequency band for each
signal.
FDMA  Frequency Division Multiple Access
FDPS  Flight.Data.Processing.System
FDR  Flight.Data.Recorder
FDRS  Flight.Data.Recorder.System
FDS  Flight.Display.System
FDU  Flux.Detector.Unit
FEATS  Future European Air Traffic Management System
FEC  Forward.Error.Correction
FEP  Front.End.Processor
FF  Fuel.Flow
FFSC  Free.Flight.Steering.Committee
FGC  Flight.Guidance.Computer
FGP  Flight.Guidance.Panel:.A.LRU.used.for.controlling.
the modes of the flight director.
FGS  Flight.Guidance.System

FHA  (.1.).Functional.Hazard.Assessment/Analysis.. (.2.).Fault.Hazard.Assessment
FHSS Frequency Hopped Spread Spectrum FHW Fault.History.Word FIB Forwarding.Information.Base FIFO First In , First Out FIM Fault.Isolation.Manual FIR Flight.Information.Region FIS (.1.).Flight.Information.Service..
(.2.).Flight.Information.System.. (.3.).Flight.Instrument.System FIS-B Flight.Information.Services-Broadcast FIX Position in space, usually on aircraft’s flight plan
FL  (.1.).Flight.Level.(as.in.FL.410.)..This.terminology. is.used.to.describe.aircraft.attitude.when.the. altimeter.is.set.at.QNE... (.2.).Foot.Lambert
FL 0  Flight.Level.180:.The.transition.altitude.(18,000.ft). for.the.United.States..At.this.altitude,.the.pilot.sets. the.barometric.correction.to.standard.atmospheric. pressure.(29.92.in-Hg).
FLCH Flight.Level.Change FLIR Forward.Looking.Infra-Red FLM Flight.Line.Maintenance FLT Flight FLTA Forward.Looking.Terrain.Avoidance FLTCTRL Flight.Control FLTINST Flight.Instrument FLW Forward.Looking.Windshear.Radar FM ( 1 ) Frequency Modulation .
(.2.).Flight.Management FMA Flight.Mode.Annunciator FMC (.1.).Flight.Director.Control.(FD).