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visit a visit that lasts only short time 
brief letter a letter containing only a
few words  noun general instructions
to enable somebody to perform their
duties
The inspector’s brief is to find
out as much as possible about the
causes of accidents.  verb to give basic
information to somebody
Before takeoff,
cabin crew must brief passengers on
the location and use of emergency exits
and life jackets.
35 bulkhead
briefing briefing /brifŋ/ noun a short meeting
to enable instructions and basic
information to be given
British Isles British Isles /brtʃ alz/ plural
noun the islands which make up Great
Britain and Ireland
The climate of the
British Isles is affected by the Atlantic
Ocean.
British thermal unit British thermal unit /brtʃ
θ%m(ə)l/ noun the amount of heat
needed to raise the temperature of one
pound of water by one degree Fahrenheit.
Abbreviation Btu
brittle brittle /brt(ə)l/ adjective having a
tendency to break easily, like thin glass

Absorption of oxygen and nitrogen
from the air at temperatures above
1,000° F makes titanium brittle.
BRNAV BRNAV abbreviation basic area navigation
broad broad /brɔd/ adjective 1. very wide

a broad river 2. wide or general
Three
broad categories of aircraft are considered
– rotary wing aircraft, light singleengine
aircraft and twin-engine aircraft.
Opposite narrow
broadcast broadcast /brɔdkɑst/ verb to
transmit, often to a large number of people,
a radio signal or message which
requires no answer
The cabin crew
can use the public address system to
broadcast messages to passengers only.
(NOTE: broadcasting – broadcast) 
noun a transmission of information
relating to air navigation that is not
addressed to a specific station or stations
broadly broadly /brɔdli/ adverb widely or
generally  broadly speaking generally
speaking
brush brush /brʃ/ noun 1. a tool that has
lengths of hair or wire fixed into a handle
and is mainly used for painting or
cleaning 2. a small, replaceable block of
carbon which rubs against the surface
of a commutator in a generator or electric
motor
At high altitude, the air
becomes drier and this causes a greatly
increased rate of wear on the brushes.
buckle buckle /bk(ə)l/ noun a metal part of
a belt used for joining the two ends
together  verb to bend out of shape
because of heat or force
Overheating
will make the battery plates buckle.
buffet buffet /bft/ noun a shaking movement
of the aircraft caused by the breakdown
of the airflow over the upper surface
of the wing
Large aircraft use a
stick shaker to supplement the natural
stall warning of buffet.  verb to push
around with great force, as by water or
wind
The storm buffeted the coast.

The aircraft was buffeted by strong
crosswinds as it made its final approach
to land.
COMMENT: Buffet is a warning to the
pilot that the smooth airflow over the
wing is breaking down and that he
should take corrective action to
prevent a stall.
buffeting buffeting /bf(ə)tŋ/ noun an irregular
shaking of a part or the whole of an
aircraft during flight, usually caused by
strong winds
buffet speed buffet speed /bft spid/ noun the
speed at which buffet is first noticed
bug bug /b$/ noun a fault in computer
software which causes the program to
operate incorrectly
build up build up /bld p/ verb to form by
accumulation
In icing conditions, ice
builds up on the leading edges.
builtup
(NOTE: building up – built up)
build-up build-up /bld p/ noun a gradual
accumulation
a build-up of static
electricity
built-up built-up /blt p/ adjective  builtup
area an area which is full of houses,
shops, offices, and other buildings, and
with very little open space
bulb bulb /blb/ noun 1. a glass ball inside
a lamp that gives electric light
If a
lamp does not work, the bulb may need
replacing. 2. something shaped like a
lamp bulb
The most common type of
hygrometer is the wet and dry bulb thermometer
arrangement.
bulkhead bulkhead /blkhed/ noun a dividing
partition across the structure of the
fuselage separating one compartment
from another for reasons of safety or
strength
A fireproof bulkhead is provided
to separate the cool area of the
　
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