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laυəns/ noun the weight of baggage
each air passenger is allowed to take
free
There is an accompanied baggage
allowance of 18 kilos.
baggage handling baggage handling /b$d"
hndlŋ/ noun the process by which
passengers’ baggage is loaded onto an
aircraft, or unloaded and moved to the
airport terminal
balance balance /bləns/ noun 1. a state in
which weight, force or importance are
evenly distributed
The propelling nozzle
size is extremely important and must
be designed to obtain the correct balance
of pressure, temperature and
thrust. 2. the act of staying steady 
verb 1. to be opposite and equal in
weight, force or importance to something
else
The pressure exerted by the
weight of the atmosphere above the
level of the bowl balances a column of
mercury in the tube. 2. to stay steady,
especially when resting on the centre of
gravity
‘…balance refers to the location of the
centre of gravity along the longitudinal
axis of the aeroplane’ [Civil Aviation
Authority, General Aviation Safety Sense
Leaflet]
ball ball /bɔl/ noun in an inclinometer, the
round object which indicates if a turn is
coordinated  to step on the ball to correct
a skid or a slip by putting pressure
on the rudder on the side to which the
ball in an inclinometer has moved during
a turn. If the ball has moved to the
left, the turn can be corrected by putting
pressure on the left rudder, and vice
versa.
balloon balloon /bə|lun/ noun a large bag
inflatable with hot air or gas to provide
lift, but without power
Balloons are
sent into the upper atmosphere to col-
BALPA 30
lect information useful to meteorologists.
BALPA BALPA /blpə/ abbreviation British
Air Line Pilots Association
band band /bnd/ noun 1. a narrow strip

A jet stream is a narrow band of highaltitude
strong winds. 2. a range of
numbers or frequencies between two
limits within a radio system
bandwidth bandwidth /bndwdθ/ noun the
width of a band of radio frequencies

The sharp setting means the bandwidth
is reduced to one kilohertz to minimise
noise or interference.
bank bank /bŋk/ verb (of an aircraft) to
rotate or roll around its longitudinal
axis to a particular angle
Stresses are
increased when the aircraft banks, turns
or pulls out of a dive.  noun (of an aircraft)
a rotating or rolling movement
around its longitudinal axis to a particular
angle
An attitude indicator gives
the pilot pitch and bank information.
bar bar /bɑ/ noun 1. a long, straight, rigid
piece of metal
The part is made from
a solid bar of aluminium. 2. (in meteorology)
a unit of atmospheric pressure
equal to 1,000 millibars.
millibar
barograph barograph /brə$rɑf/ noun an
instrument for measuring and recording
atmospheric pressure
The most common
type of barograph is that which utilises
an aneroid capsule mechanically
connected to a pen.
barometer barometer /bə|rɒmtə/ noun an
instrument for measuring the atmospheric
pressure
barometric barometric /brə|metrk/ adjective
referring to a barometer  barometric
pressure atmospheric pressure as indicated
by a barometer
barometric tendency barometric tendency
/brəmetrk tendənsi/ noun the
amount of change in pressure with
increase in altitude
barrel roll barrel roll /br(ə)l rəυl/ noun a
manoeuvre in which an aircraft turns
completely over sideways while flying
along
barrier barrier /briə/ noun 1. something
such as a wall that prevents the movement
of something else
Elevation of
the ground over which the aircraft flies
can be a dangerous barrier to flight. 2.
something that prevents a person from
making progress
His medical problems
were a barrier to his successful
completion of the course.
base base /bes/ noun the bottom part or
lowest part  verb to develop or develop
something from something else
The
operation of the auxiliary power unit is
based on the gas turbine engine.
The
principle of vapour cycle cooling is
based upon the ability of a refrigerant
to absorb heat.
base leg base leg /bes le$/ noun the part of
the airfield traffic circuit flown at
approximately 90° to the direction of
landing, followed by the final approach.

leg
basic basic /besk/ adjective referring to
　
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