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Special seats are allocated to
mothers with small children.
allocation allocation /lə|keʃ(ə)n/ noun the
provision of something particular for a
given purpose
At the check-in desk,
airline staff are responsible for the allocation
of seats to passengers.  frequency
allocation the frequency or
range of radio frequencies set aside for
a particular use
The frequency allocation
for VOR is 108–117.975 MHz.
allow allow /ə|laυ/ verb to enable, to permit
or to authorise
An engine should be
run at low rpm after flight to allow
engine components to cool.
Additional
fuel is carried to allow for holding
en route.
Passengers are not
allowed to smoke on some aeroplanes.
allowable allowable /ə|laυəb(ə)l/ adjective permitted
or authorised
maximum allowable
weight
maximum allowable tyre
pressure
allowance allowance /ə|laυəns/ noun 1. consideration
for possibilities or changing circumstances
 to make allowances for
to take into account
When estimating
flight duration, make allowances for
taxiing time. 2. something such as
money given at regular intervals or for a
specific purpose
a travel allowance to
cover hotel and restaurant bills. 3. the
amount of something that somebody is
allowed to have
‘…with many four and six seat aircraft, it
is not possible to fill all the seats, use the
maximum baggage allowance, fill all the
fuel tanks and remain within the approved
centre of gravity limits’ [Civil Aviation
alloy 16
Authority, General Aviation Safety Sense
Leaflet]
alloy alloy /lɔ/ noun a mixture of metals

an alloy of aluminium and lithium
aloft aloft /ə|lɒft/ adjective up in the air
alter alter /ɔltə/ verb to change, modify or
adjust
If there is a risk of collision,
alter course to the right.
If the rate of
descent is too low, alter the throttle setting
accordingly.
The rudder linkage
was altered to comply with certification
requirements.
alteration alteration /ɔltə|reʃ(ə)n/ noun 1. a
change, modification or adjustment
It
was discovered that alterations had
been made to the log book.
As a result
of the accident, alterations were made
to the design of the carburettor heat system.
2. the act of making changes, modifications
or adjustments  heading
alteration the act of making of heading
corrections
alternate alternate adjective /ɔl|t%nət/ 1.
every other
A, c, e, and g are alternate
letters, as are b, d, f, h, etc.  alternate
days every other day
There are outward
flights on alternate days, i.e. on
Mondays, Wednesdays and Fridays. 2.
US same as alternative  noun /ɔl|
t%nət/ an aerodrome of second choice
to be used if the aircraft cannot be
landed at the aerodrome of first choice
because of bad weather, etc.
The point
of no return is calculated before departure
to cover the chance that both the
terminal airfield and its alternate
become unavailable during flight. 
verb /ɔltənet/ to happen in turns 
Captain Smith and Captain Jones
alternate as CFI on a daily rota each
captain has one day on duty as CFI followed
by a day off, on which the other
captain acts as CFI
alternating current alternating current /ɔltənetŋ
krənt/ noun an electric current which
reverses its direction at regular intervals

Resistance to alternating current
remains almost constant and is independent
of frequency. Abbreviation AC
alternative alternative /ɔl|t%nətv/ adjective
referring to another or a second possibility

A turbine bypass, in the form of
an alternative exhaust duct is fitted with
a valve.  an alternative means of
doing something another or different
way of doing something  noun another
choice or possibility
In some emergency
situations the pilot may have no
alternative but to force-land the aircraft
as soon as possible.
alternator alternator /ɔltənetə/ noun a type
of generator designed to produce AC
power
altimeter altimeter /ltmitə/ noun a radio
instrument for measuring vertical distance
or altitude  altimeter check a
routine check to ensure that the altimeter
pressure setting is correct  altimeter
display the display of altitude information,
which can be given in analogue
　
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本文鏈接地址：Dictionary of Aviation上(16)