FAN AIR
AIR FAN, part of the air flow through the turbofan engine, which only passes through the fan.
FAN COWL
HOOD FAN, casing around fan section, which can be opened for access to the engine components.
FASTENER
CLIP, a mechanical element such as a bolt, nail, screw or rivet, which is used to join two objects together.
FATIGUE OR FATIGUE FAILURE
Tiredness or fatigue failure, the destruction of the material due to the bending motions or different vibration loads.
FAULT ISOLATION MANUAL
GUIDE single fault, manual that contains the procedures to isolate and correct the failure message on the plane. Used mechanics on the line.
FAULT REPORTING MANUAL (FRM)
GUIDE failure message (FRM), leadership, the crew used to facilitate communication about the problems in the systems of the aircraft.
FAYING SURFACE
Adjacent surface, overlapping zone adjacent overlapping surfaces.
FEEDBACK
FEEDBACK part of the output signal, which is returned as an input for control or display.