"航 空 略 缩 语
AAC Army Air Corps
AAIB Air Accident Investigation Branch of the Department of the Environment, Transport and the Regions.
aae above aerodrome elevation. Also see "aal".
aal above aerodrome level. Also see "aae".
ab initio elementary flying training, literally 'from the beginning'.
abm abeam an aircraft is abeam a point when that point is at ninety degrees left or right of the aircraft's track, but term usually used to indicate a general position rather than a specific point.
ACARS Aircraft Communication Adressing and Reporting System
AC alternating current
ACC Area Control Centre
ACZ Aerodrome Control Zone
ACMS aircraft condition monitoring system
ACR aerodrome control radar
accelerate-stop distance calculated distance required for an aircraft to accelerate to V1 (which see), reject take-off and brake safely to a halt.
AD Airworthiness Directive, issued by airworthiness authorities to correct a defect found in an aircraft type after certification. Compliance is mandatory and may be required immediately and before further flight,within a specified period of time or number of flying hours, or when next due for routine maintenance.
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