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itself without the need of an operator

The normal activation method is automatic.
automatic dependent surveillance automatic dependent surveillance
/ɔtəmtk d|pendənt sə|
veləns/ an electronic surveillance system
that uses data that aircraft provide
automatically via a datalink and is able
to identify and track the aircraft
automatic direction finder automatic direction finder
/ɔtəmetd da|rekʃ(ə)n fandə/
noun a radio navigation instrument that
receives signals from non-directional
radio beacons
The needle on the ADF
indicator points toward the selected
radio signal. Abbreviation ADF
automatic landing automatic landing /ɔtəmtk
landŋ/ noun automatic flight control
system capable of landing an aircraft
‘hands-off.’ Abbreviation autoland
automatic mixture control automatic mixture control
/ɔtəmtk mkstʃə kən|trəυl/ noun
a subsystem in a piston engine which
adjusts the flow of fuel to balance
changes in air density
automatic pilot automatic pilot /ɔtəmtk
palət/ noun full form of autopilot
Automatic Terminal Information Service Automatic Terminal Information
Service /ɔtəmtk t%mn(ə)l
nfə|meʃ(ə)n s%vs/ noun a recording
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. Abbreviation
ATIS
automation automation /ɔtə|meʃ(ə)n/ noun
the automatic operation or automatic
control of a piece of equipment, a process,
or a system
Automation has
speeded up baggage handling.
Automation
of throttle control has removed
the need for pilots to monitor airspeed
so closely.
It is possible that the alternate
source might provide a reduced
level of automation.
autopilot autopilot /ɔtəυpalət/ noun a system
which automatically stabilises an
aircraft about its three axes, restores the
original flight path following an upset
and, in some systems, causes the aircraft
to follow a preselected airspeed,
altitude or heading. Full form automatic
pilot. Abbreviation A/P
auxiliary auxiliary /ɔ$|zliəri/ adjective secondary,
which is used when necessary
to help or substitute for something else
auxiliary gearbox auxiliary gearbox /ɔ$|zliəri $ə|
bɒks/ noun a gear box which allows
main engine power to be used for secondary
systems
auxiliary power unit auxiliary power unit /ɔ$|zliəri
paυə 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 auxiliary rotor /ɔ$|zliəri rəυtə/
noun the tail rotor of a helicopter
availability availability /ə|velə|blti/ noun the
fact of being available
The status of an
airport is determined by the availability
of suitable navigation aids.
available available /ə|veləb(ə)l/ adjective
ready for immediate use
On a multiengine
aircraft, all the fuel must be
available for use by any engine.
average average /v(ə)rd"/ adjective referring
to an average
For load sheet purposes,
an average weight of the passengers
and crew members may be used. 
noun the total divided by the number of
items added
The average of 1, 5, 9, 10
and 15 is 8 (1+5+9+10+15 = 40 ÷ 5 =
8).  verb to reach a particular figure as
avert 28
an average
Brake temperatures average
around 500°C during normal operations.
avert avert /ə|v%t/ verb to avoid
To avert
a collision, he changed direction.
AVGAS AVGAS /v$s/ abbreviation aviation
gasoline
aviation aviation /evi|eʃ(ə)n/ noun flying
an aircraft
Wind speeds in aviation are
usually given in knots.
aviation gasoline aviation gasoline /evieʃ(ə)n
$səlin/ noun fuel used in pistonengined
aircraft. Abbreviation AVGAS
aviation law aviation law /evi|eʃ(ə)n lɔ/ noun
the laws relating to flying
　
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本文鏈接地址：Dictionary of Aviation上(27)