Glossary of Terms


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A

ALSF-2

ALSF-2:   Approach Lighting System with Sequenced Flashing Lights configuration 2


Alternate aerodrome or heliport

“alternate aerodrome or heliport” means an aerodrome or heliport (including the
aerodrome or heliport of departure), which may be specified in a flight plan, to
which an aircraft in flight may proceed when it becomes impossible or inadvisable
to proceed to or to land at the aerodrome or heliport of intended landing; alternate
aerodromes include the following:


“take-off alternate” means an alternate aerodrome at which an aircraft can land
should this become necessary shortly after take-off and it is not possible to use the
aerodrome of departure;


“en-route alternate” means an aerodrome at which an aircraft would be able to land
after experiencing an abnormal or emergency condition while en route;


“ETOPS en-route alternate” means a suitable and appropriate alternate aerodrome at
which an aeroplane would be able to land after experiencing an engine shutdown or
other abnormal or emergency condition while en-route in an ETOPS operation;


“destination alternate” means an alternate aerodrome to which an aircraft may
proceed should it become either impossible or inadvisable to la nd at the aerodrome
of intended landing;


Alternate airport

‘Alternate airport’ means an airport at which an aircraft may land if a landing at the intended airport becomes inadvisable.


Altimetry system error

“altimetry system error (ASE)” means the difference between the altitude indicated
by the altimeter display assuming a correct altimeter barometric setting and the
pressure altitude corresponding to the undisturbed ambient pressure;


AMA

Area minimum altitude (AMA). The minimum altitude to be used under instrument meteorological conditions (IMC), that
provides a minimum obstacle clearance within a specified area, normally formed by parallels and meridians.


AMD

Ammended


Ampere

Ampere (A). The ampere is that constant electric current which, if maintained in two straight parallel conductors of infinite
length, of negligible circular cross-section, and placed 1 metre apart in a vacuum, would produce between these
conductors a force equal to 2 × 10–7 newton per metre of length.


Angle of Incidence

The Angle of Incidence is the angle at which a wing is mounted onto a fuselage relative to the longitudinal axis.  It is also known as the Rigger's Angle.


ANSP

ANSP - Air Navigation Service Provider


Anti-collision light

“anti-collision light” means:
(a) in relation to rotorcraft, a flashing red light, and


(b) in relation to other aircraft, a flashing red or flashing white light and, in either case
showing in all directions for the purpose of enabling the aircraft to be more readily
detected by pilots of distant aircraft



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