automatic mixture control
/.t.mt.k m.kst.. k.ntr.υl/ noun
a subsystem in a piston engine which adjusts the flow of fuel to balance changes in air density

automatic pilot /.t.mt.k
pa.l.t/ noun full form of autopilot Automatic Terminal Information Service /.t.mt.k tm.n(.)l .nf.me..(.)n sv.s/ noun a record-
ing of information played continuously on a specified radio frequency which gives pilots the current weather, runway in use, etc. . Students listen to the ATIS to practise their language skills. Abbre-viation ATIS
automation /.t.me..(.)n/ noun
the automatic operation or automatic control of a piece of equipment, a proc-ess, or a system . Automation has speeded up baggage handling. . Auto-mation of throttle control has removed the need for pilots to monitor airspeed so closely. . It is possible that the alter-nate source might provide a reduced level of automation.
autopilot /.t.υpa.l.t/ noun a sys-tem which automatically stabilises an aircraft about its three axes, restores the original flight path following an upset and, in some systems, causes the air-craft to follow a preselected airspeed, altitude or heading. Full form auto-matic pilot. Abbreviation A/P
auxiliary /.z.li.ri/ adjective sec-
ondary, which is used when necessary to help or substitute for something else

auxiliary gearbox /.z.li.ri ..
b.ks/ noun a gear box which allows main engine power to be used for sec-ondary systems
auxiliary power unit /.z.li.ri paυ. jun.t/ noun a small jet engine used to generate electrical power for air-conditioning, etc., when the aircraft is parked on the ground. Abbreviation
APU auxiliary rotor /.z.li.ri r.υt./
noun the tail rotor of a helicopter
availability /.ve.l.b.l.ti/ noun the
fact of being available . The status of an airport is determined by the availability of suitable navigation aids.
available /.ve.l.b(.)l/ adjective
ready for immediate use . On a multi-engine aircraft, all the fuel must be available for use by any engine.
average /v(.)r.d/ adjective refer-ring to an average . For load sheet pur-poses, an average weight of the passen-gers and crew members may be used. .
noun the total divided by the number of items added . The average of 1, 5, 9, 10 and 15 is 8 (1+5+9+10+15 = 40 ÷ 5 = 8). . verb to reach a particular figure as

avert 28
an average . Brake temperatures aver-age around 500°C during normal oper-ations.
avert /.vt/ verb to avoid . To avert a collision, he changed direction.
AVGAS /vs/ abbreviation avia-
tion gasoline aviation /e.vie..(.)n/ noun flying an aircraft . Wind speeds in aviation are usually given in knots.
aviation gasoline /e.vie..(.)n s.lin/ noun fuel used in piston-engined aircraft. Abbreviation AVGAS
aviation law /e.vie..(.)n l./ noun
the laws relating to flying

aviation routine weather report
/e.vie..(.)n rutin weθ. r.p.t/ noun a weather report issued regularly at intervals of an hour or half an hour describing weather conditions at an air-port. Abbreviation METAR