acidity /.s.d.ti/ noun having an acid content . the acidity of a substance the amount of acid in a substance
acid-proof /s.d pruf/ adjective
able to resist the harmful effects of an
acid acid test /s.d test/ noun a difficult or exacting test of worth or quality . A pilot’s ability to react appropriately in an emergency situation is the acid test of his or her professionalism.
ACMS noun a computer which records information from various aircraft sys-tems during flight. Full form aircraft condition monitoring system
ACN abbreviation aircraft classifica-tion number
acoustic /.kust.k/ adjective refer-
ring to sound
acoustic ear muffs /.kust.k .. mfs/ plural noun coverings to protect the ears from loud noise. Also called
ear protectors, ear defenders acquire /.kwa../ verb to buy or oth-erwise obtain . to acquire a new air-
5 adapt
craft 0 Speed control is used to acquire and maintain a selected airspeed.
acquisition /，.kw.'z.. (.)n/ noun
the act of buying or otherwise obtaining
0 Each computer checks data acquisi-tion. 0 The image of the airline improved after the acquisition of the new aircraft.
acronym /'.kr.n.m/ noun a word which is made up of the initial letters of a name, and is pronounced as a word 0
NASA is the acronym for National Aer-onautics and Space Administration. 0 VASI is the acronym for visual approach slope indicator.
act /.kt/ verb 1. to behave in a partic-ular way 0 The crew must act with authority. 2. to take the role of 0 Moun-tain ranges act as a barrier. 0 The gov-ernor spill valve also acts as a safety relief valve. 3.口 to act on to produce an effect 0 Bending and twisting forces act on a propeller. 0 Gravity acts vertically downwards.
acting /'.kt../ adjective temporarily taking on the responsibilities of some-body 0 Captain Smith will be acting Chief Flying Instructor while Captain White is absent from work.
action /'.k..n/ noun 1. something done or to be done 口 to take action to so something 0 If there is a risk of colli-sion, the crew should take the appropri-ate action. 2. an effect
activate /'.kt.ve.t/ verb to make a system or a piece of equipment or a pro-cedure start to work or to operate 0 The system is activated by the pilot or copi-lot. 0 The sounding of the alarm will activate emergency procedures.
activation /.kt.'ve..(.)n/ noun the act of making something start to work or to operate 0 Activation may be mechanical or electrical.
active /'.kt.v/ adjective 1. live, in action or use口 the system is active the system is on and working 2. not passive
口 in a secondary radar system, the target is active in a secondary radar system the target transmits a signal while in a primary radar system it does not 3.口 active Cb clouds developing cumulonimbus clouds
active runway /，.kt.v 'rAnwe./
noun a runway that is being used
‘…never cross an active runway without
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