anabatic /n.bt.k/ adjective
referring to a warm flow of air travel-ling up a hillside or mountainside. Compare katabatic
anabatic wind /n.bt.k w.nd/
noun a wind current, caused by solar heating of the land, that rises up a south-facing mountainside . South-facing slopes are most suitable for the ana-batic wind. Compare katabatic wind
analog /n.l./ adjective same as
analogue analogous /.nl..s/ adjective
similar or comparable to . Isobars are analogous to contour lines.
analogue /n.l./ adjective 1. rep-
resenting a quantity or signal that varies continuously by means of a physical apparatus such as a dial and pointer .
The electronic centralised aircraft mon-itor (ECAM) does not have analogue
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presentation of engine information. 2. .
analogue display (on a clock) a tradi-tional hands and face display on a clock or dial. Compare digital display
analyse /n.la.z/, analyze verb to
break down into parts and study very closely . to analyse fuel to separate fuel into its different parts to find out what it consists of . to analyse a chart to examine a chart in detail
analysis /.nl.s.s/ noun breaking down a substance into its parts in order to study them closely . At a crash site, samples of materials are removed for analysis. (NOTE: The plural form is anal-yses /.nl.siz/ .) . chart analysis
careful study of charts
anchor /.k./ noun a device con-nected to and dropped from a boat in order to prevent the boat from moving in the water . verb to drop an anchor to prevent the boat from moving
anemograph /.nem.rɑf/ noun
an instrument which maintains a contin-uous recording of wind direction and speed on a graph . The anemograph gives a continuous recording of wind velocity which is displayed on a chart and reveals gusts, squalls and lulls.
anemometer /n.m.m.t./ noun an
instrument, usually attached to a build-ing, with three or four ‘cups’ which rotate with the wind thus providing wind-speed information . The strength of the wind can be seen by the speed with which the anemometer rotates.
aneroid /n.r..d/ adjective not con-taining or using liquid
aneroid barometer /n.r..d b.
r.m.t./ noun a barometer which uses an aneroid capsule to sense atmospheric pressure changes
aneroid capsule /n.r..d kpsjul/ noun a thin flexible cylin-drical box, usually made of metal, which has most of the air removed from it and which expands and contracts with changes in atmospheric pressure . The aneroid capsule in the barometer is connected to a system of levers which operate a pointer.
aneroid switch /n.r..d sw.t./
noun a switch operated by an aneroid capsule
angle /..l/ noun the difference in direction between two lines or surfaces measured in degrees
angle of attack /.(.)l .v .tk/
noun the angle formed between the rel-ative airflow and the chord line of the aerofoil
COMMENT: The angle of attack is related to the flight path of the aircraft, not to the angle the wing makes with the horizontal. If the angle of attack becomes too great, the smooth airflow over the upper surface of the wing will break down. If no corrective action is taken by the pilot, there will be a sudden loss of lift and the aircraft will stall.
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