Glossary of Terms

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Factor of safety

Factor of safety. A design factor used to provide for the possibility of loads greater than those assumed, and for uncertainties
in design and fabrication.


Final approach fix or point. That fix or point of an instrument approach procedure where the final approach segment

Fan marker beacon

Fan marker beacon. A type of radio beacon, the emissions of which radiate in a vertical fan-shaped pattern


FANS 1/A - Future Air Navigation System 1 or A. (Respectively, Boeing and Airbus Proprietary Air-Ground ATC Data Link Communications Systems)


Farad (F). The capacitance of a capacitor between the plates of which there appears a difference of potential of 1 volt when
it is charged by a quantity of electricity equal to 1 coulomb.


Fatigue. A physiological state of reduced mental or physical performance capability resulting from sleep loss or extended
wakefulness, circadian phase, or workload (mental and/or physical activity) that can impair a crew member’s alertness and
ability to safely operate an aircraft or perform safety-related duties.


Final approach and take-off area (FATO). A defined area over which the final phase of the approach manoeuvre to hover or
landing is completed and from which the take-off manoeuvre is commenced. Where the FATO is to be used by
performance Class 1 helicopters, the defined area includes the rejected take-off area available.


FBL - Used in meteorology meaning "light" as in precipitation or icing.


FDE - Fault Detection and Exclusion

Feathered Pitch

‘Feathered Pitch’ means the pitch setting, specified in the appropriate propeller manual, which in flight with the engine stopped, gives approximately the minimum drag, and corresponds with a windmilling torque of approximately zero.

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