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done or to be done  to take action to
so something
If there is a risk of collision,
the crew should take the appropriate
action. 2. an effect
activate activate /ktvet/ verb to make a
system or a piece of equipment or a procedure
start to work or to operate
The
system is activated by the pilot or copilot.

The sounding of the alarm will
activate emergency procedures.
activation activation /kt|veʃ(ə)n/ noun the
act of making something start to work
or to operate
Activation may be
mechanical or electrical.
active active /ktv/ adjective 1. live, in
action or use  the system is active the
system is on and working 2. not passive
 in a secondary radar system, the
target is active in a secondary radar
system the target transmits a signal
while in a primary radar system it does
not 3.  active Cb clouds developing
cumulonimbus clouds
active runway active runway /ktv rnwe/
noun a runway that is being used
‘…never cross an active runway without
permission from the tower: there may be
more than one active runway’ [Civil
Aviation Authority, General Aviation
Safety Sense Leaflet]
activity activity /k|tvti/ noun a movement
or action of some kind
Sunspot activity
can affect the amount of solar radiation.
actual actual /ktʃuəl/ adjective real
The
actual path of the aircraft over the
ground is called its track, which may
not be the same as the desired course.
actually actually /ktʃuəli/ adverb in fact, in
reality
The design is such that,
although the aircraft loses altitude rapidly,
it does not actually stall.
actuate actuate /ktʃu|et/ verb 1. to move a
device or a part
The fore and aft movement
of the control column actuates the
elevators. 2. to switch on a system or a
piece of equipment, or put it into operation

A lever actuates the fire deluge
system. 3. to put a procedure into action

Receipt of the distress signal will
actuate the support facilities at the airport.
actuation actuation /ktʃυ|eʃ(ə)n/ noun 1.
the act of making a device or a part
move  electrical actuation the use of
an electric motor to make something
move  mechanical actuation the use
of a mechanical part such as a rod, arm
or lever to make something move 2. a
movement made by a device or part
actuator actuator /ktʃυetə/ noun a device
which changes electrical or hydraulic
energy into mechanical motion
The
actuator control is sensitive to engine
rpm.
Actuators are classified as either
linear or rotary.
ADAD abbreviation airworthiness directive
A/D A/D abbreviation aerodrome
ADA ADA abbreviation advisory airspace
adapt adapt /ə|dpt/ verb 1. to change or
modify for special use
The turboprop
engine is often used in transport aircraft
and can be adapted for use in single-
engine aircraft. 2. to change to suit
adaptation 6
new conditions
Crew flying long-haul
routes have to adapt to time changes.
adaptation adaptation /dp|teʃ(ə)n/ noun 1.
the act of changing or modifying something
for special use
Doppler VOR is
an adaptation of VOR to reduce errors
caused by location. 2. adjustment to
new conditions
Adaptation to time
changes when travelling west to east
takes time.
adapter adapter /ə|dptə/ noun 1. a piece of
equipment or device which allows a
change or modification  a ‘T’ piece
adapter a device for connecting two
inputs to one output or vice versa 2. a
device that allows two incompatible
devices to be connected
ADC ADC /e di si/ abbreviation air data
computer
add add /d/ verb 1. to put figures together
to form a sum, to make a total
Add the
two numbers together to find the sum. 2.
to put together to make a larger group or
a group with different properties

There are only nine chairs, add another
one.
A substance is added to the fuel
to clean fuel injectors.
addition addition /ə|dʃ(ə)n/ noun 1. a mathematical
operation consisting in putting
numbers together
Addition is normally
taught before subtraction, multiplication
and division.
The addition
sign is +. 2. the act of adding something

With the addition of methanol, the turbine
inlet temperature is restored. 3. 
in addition also  in addition to as
　
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