centre /sent./ noun 1. the middle .
The plane of the great circle passes through the centre of a sphere. . centre of a circle mid-point of a circle, point in the middle of a circle 2. a main building or office . Area Forecasting Centre . verb to move to a central position .
Centre the control column. (NOTE: cen-tred – centring; the US English is cen-tered – centering.)
centre fix /sent. f.ks/ noun same as self-positioning centreline /sent.la.n/ noun a
painted or imaginary line running along the centre of the runway (NOTE: It is also written centre line; written centerline in US English.)
centre of gravity /sent. .v rv.ti/ noun the point at which a body can be balanced . Distribution of the tanks and the fuel in the tanks is vital in maintaining the aircraft centre of gravity and trim. Abbreviation CG
COMMENT: If the centre of gravity is
outside the limits, the aircraft may be
difficult or impossible to control.
centrifugal /sentr.fju(.)l, sen tr.fjυ(.)l/ adjective moving away from the centre . The blades must be strong enough to carry the centrifugal loads due to rotation at high speed.
centrifugal force /sentr.fju(.)l f.s/ noun outward force caused by turning motion
centrifuge /sentr.fjud/ noun a
device which uses centrifugal force to separate or remove liquids . verb to separate liquids by using centrifugal force . The rotating vanes of the breather centrifuge the oil from the mist.
centripetal 42
centripetal /sentr.pit(.)l, sen
tr.p.t(.)l/ adjective moving towards the centre
centripetal force /sentr.p.t(.)l f.s/ noun inward, centre-seeking force working in opposition to centrifu-gal force . The magnitude of the cen-tripetal force varies with the square of the wind speed. . In a turn, lift provides the centripetal force.
certain /st(.)n/ adjective 1. partic-ular, some . in certain areas . at cer-tain times . under certain circum-stances 2. sure . There are certain to be horizontal differences in the mean tem-perature of a layer. . to make certain to make sure . Make certain that the parking brake is on before doing engine run-up checks.
certificate noun /s.t.f.k.t/ an offi-cial document which states that particu-lar facts are true . verb /s.t.f.ke.t/ to award or give a certificate . aircraft which are certificated for flight air-craft which have the necessary paper-work to be authorised to fly
certificate of airworthiness /s. t.f.k.t .v e.we.n.s/ noun a docu-ment issued by an aviation authority stating that an aircraft meets specific safety and performance requirements that allow it to be used in service . An authorised person may require produc-tion of the Certificate of Airworthiness.
Abbreviation C of A certification /s.t.f.ke..(.)n/ noun
the process of giving certificates . The inferential method of ice detection is used on flight trials for certification of aircraft.
certify /st.fa./ verb to authorise or permit the use of something . The air-craft is certified for aerobatic flight.
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