batsmannoun some body who uses a pair of bats to guide an aircraft when it is taxiing or parking batterynoun a chemical device that produces electrical current o This piece of equipment is powered by 2 batteries. i> charger baynoun 1. a space or area in the structure of an aeroplane where equipment can be located o To avoid damage to the wheel bay, the nose wheel must be aligned in a fore and aft direction during retraction. 2. a part of the coast that curves inwards o the Bay of Bengal bayonet fittingf noun a means of attaching something to something, in which an object with two side pins is inserted into a L-shaped slot in another object on some light-bulbs o Magnetic chip detectors are of the bayonet type fitting and can be removed and replaced very quickly.
beamnoun 1. a long thick metal bar used as a support o A beam is designed with a breaking load of 12 tons but when a three ton load is applied repeatedly, the beam may fail. 2. a shaft of light or radiation travelling in one direction, as from a car’s headlights o The electron gun produces a stream of fast-moving electrons and focuses them into a narrow beam.
bearverb 1. to carry or to hold o The undercarriage has to bear the weight of the aircraft on the ground. □ rain-bearing cloud a cloud carrying moisture which can fall as rain 2. □ to bear something in mind to keep in mind □ it should be borne in mind it should be remembered □ bearing in mind considering o Bearing in mind that she hadn’t flown for three weeks, the student pilot’s landings were very good. 3. to be able to deal with something without becoming distressed or annoyed o He can’t bear the noise. (note: bearing – bore – borne) □ he can’t bear the heat the heat is too much for him
bearing‘ noun 1. the angle, measured in a clockwise direction, of a distant point, relative to a reference direction o To plot a position line from the non-directional radio beacon, it is first necessary to convert the relative bearing to a true bearing and then calculate the reciprocal. 2. a device containing steel balls or needles which allows free rotation of one component around another
belly landing,tendiq/ noun an emergency landing of an aircraft when the wheels have not come down beltnoun 1. a long, relatively narrow area □ high-pressure belt long narrow area of high pressure □ precipitation belt a long narrow area of rain, snow or hail □ rain belt long narrow area where rain falls o The cirrus cloud can be 900 miles ahead of the surface front with a rain belt as wide as 200 miles. 2. a loop of strong material connecting two pulleys or wheels, one driving the other
belt-driven generator noun a generator whose pulley is turned by a belt attached to an engine-driven pulley bend /bend/ noun a curve ■ verb to curve from a straight shape (note: bending – bent) □ to bend downwards to curve down from a horizontal position □ to bend upwards to curve up from a horizontal position o The wings support the weight of the aircraft and they bend upwards in flight.
bending load " "" " noun a load that causes a structure to bend Bernoulli’s principle ‘ noun » lift beware‘ verb to be careful or to watch out for o Beware of carburettor icing. o Beware of other aircraft in the circuit.
beyondpreposition further away than o The radio horizon extends beyond the visible horizon. □ it is beyond his understanding he cannot understand it at all, it is too difficult for him to understand bi-‘ prefix 1. two 2. twice biannualadjective happening two times a year □ biannual inspection an inspection done twice every year
bill ,noun US same as note noun 4 bimetallicadjective made of two metals bimetallic strip noun a strip made of two separate metals with different rates of expansion, joined together side by side so that when the strip is heated, it bends and makes, or breaks, electrical contact o Circuit breakers use a bimetallic strip as the sensing element.
blade .noun a flattened part of a propeller or rotor □ blade tip the end of the blade furthest from the centre of rotation □ turbine blade a flat part in a turbine, which has an aerodynamic effect on the air
blade slipnoun a loss of propulsive power from a propeller caused by the difference between geometric and effective pitch blade twistnoun 1. a reduction in propeller blade angle from root to tip 2. the unwanted variation in propeller blade pitch from root to tip caused by aerodynamic loads blankadjective 1. with nothing written, printed or drawn on it o a blank sheet of paper □ a blank form a form without the details filled in 2. (of a TV, computer or video screen) with nothing appearing on it o When he returned to his computer, the screen was blank.
blind transmission noun a transmission from one station to another in a situation where two-way communication cannot be established but where it is believed that the called station is able to receive the transmission
blocknoun a large mass of something ■ verb 1. to prevent something such as a fluid from passing freely through a pipe or channel o At high altitude, any water condensing out of the fuel could freeze and block the filters. 2. to prevent a course of action o The government blocked attempts to prevent the building of the new airport.
blockagenoun 1. a collection of something blocking a pipe, narrow channel, filter, etc. o Ice crystals may form to cause a blockage of the fuel filter. 2. the state of being blocked o The blockage was caused by ice.
blow ,noun 1. an impact o a blow on the head 2. a disappointment o The news of her failure in the examination was a severe blow. ■ verb 1. (of the wind or air) to move o The sea breeze may blow almost parallel to the coast. 2. (of a fuse) to break, as it should, when the circuit is overloaded (note: blowing -blew – blown)
boardnoun 1. a flat, square or rectangular piece of wood or other material 2. □ on board on an aircraft o The flight plan records the callsign and the number of people on board. ■ verb to get on to an aircraft o In an emergency many passengers only remember the entrance by which they boarded the aircraft.
bodynoun 1. the whole of a person or an animal 2. the main part of a person, but not the arms or legs 3. the main part of an aeroplane, system, text, etc. o The body of an aircraft is also called the ‘airframe ‘. o A flow-control valve consists of a body and a floating valve. 4. a large mass of liquid or gas □ body of air a large quantity of air behaving in a particular way 5. an object o Acceleration is the rate of change of velocity of a body.
boilverb to heat a liquid until it reaches a temperature at which it changes into gas o Water boils at 100°C. □ boiling point the temperature at which a liquid changes into gas o The boiling point of water is 100°C.
boltnoun 1. a metal rod with a head, which screws into a nut o The two halves of the wheel are held together by bolts. 2. □ bolt of lightning one electrical discharge of lightning verb to attach with a bolt o Aircraft wheels are constructed in two halves which are bolted together.
bondnoun the power that holds surfaces together, when they are joined using heat, cold, chemicals or glue o The de-icing boot breaks the bond between the ice and the outer skin. verb to join surfaces together normally using heat, cold, chemicals or glue o The skin is bonded to the internal members by the redux process.
boostnoun an increase or improvement The improvement in a country’s economy often gives a boost to the airline industry. verb 1. to make or to help something increase o An oil pump boosts engine oil pressure. 2. to increase o The instructor’s comments boosted the student pilot’s confidence.
booster pumpnoun a centrifugal pump often positioned at the lowest point of a liquid fuel tank to ensure positive pressure in the supply lines to the engine o Fuel is fed through a filter and a booster pump. o The purpose of the booster pump is to prevent fuel aeration.
bootnoun one of a set of flat, flexible tubes bonded to the leading edge or wings and other surfaces which, when pressurised with fluid, break up ice o The boots on the leading edge of the wings were damaged by hail.
bottlenecknoun a buildup of air traffic causing delays in taking off or landing boundadjective □ bound for on the way to o an aircraft bound for Paris □ the Copenhagen-bound flight the flight on the way to Copenhagen □ outward bound leaving home, especially for another country boundarynoun a physical or imaginary limit between two areas o The boundary between two air masses is called the frontal surface.
brace ,‘ verb 1. to strengthen a construction using cross-members and/or wires o Early aircraft were of the braced type of construction. 2. to take a protective body position in preparation for a crash landing o The cabin-crew will repeat the ‘brace ‘ order and brace themselves. □ to brace yourself to quickly prepare yourself mentally and physically for what is shortly to happen
bracketnoun 1. a metal support, often triangular or L-shaped □ component bracket a metal device to attach and support a component 2. a range of frequencies within a band of radio frequencies o Terminal VOR is in the frequency bracket 108—112 MHz. 3. round brackets the printing symbol ( ) used to separate words in a sentence, or within a text □ square brackets the printing symbol [ ] used to enclose some types of text
brakenoun a device for stop ping a vehicle or a machine □ parking brake a brake used to prevent the aircraft moving after it has come to a stop verb to slow down or to stop by pressing the brakes o He had to brake hard after landing in order to turn off at the correct taxiway. (note: braking -braked)
brake drumnoun a round hollow part of the brake mechanism, which is attached to the wheel and against which the brake shoes rub, thus preventing the wheel from turning brakingnoun the act of putting on the brakes to slow down or to stop adjective slowing down o the braking effect of drag i> action breaking loadnoun a load capable of being supported before a structure breaks breathernoun 1. a pipe connecting the crankshaft to the atmosphere to prevent build-up of crankcase pressure 2. a short rest (informal) □ to take a breather to have a short break, to relax before starting again breezenoun a gentle wind especially near the coast o There’s no wind, not even a breeze. □ land breeze a light wind which blows from the land towards the sea o Land and sea breezes occur in coastal areas. □ sea breeze a gentle wind which blows from the sea towards the land The strength of the sea breeze decreases with height.
Briefadjective short □ brief 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 o The inspector’s brief is to find out as much as possible about the causes of accidents.verb to give basic information to somebody o Before takeoff, cabin crew must brief passengers on the location and use of emergency exits and life jackets.