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eakaway thrust
2 Altitude at which pilot abandons approach in bad
weather.
3 In nuclear explosion, point in space or time at which
shockfront moves ahead of expanding fireball.
breakaway thrust Engine power needed to initiate movement
and reach taxiing speed.
breakdown book Record of physical changes introduced
during maintenance, servicing or repair.
breakdown drawing Isometric or perspective drawing
showing parts separated from each other by being
displaced along one or more axes. Often called exploded
drawing.
breakdown potential Dielectric strength.
breaker strip 1 Linear narrow de-icing element, either
thermal or mechanical, arranged along leading edge (eg of
wing or engine inlet strut) to split ice accretion into two
parts.
2 See stall strip.
break-even load factor Load factor at which a particular
flight, service, aircraft type or overall airline operation
shows a net profit.
break-even point 1 In any commercial aircraft operation,
load factor at which total revenue equals total cost.
2 In manufacture, number of sales required to cover
investment.
breakin, break-in First bench run of new type of engine
or other device, or following major overhaul.
break lock To use ECM or other countermeasure to
make hostile tracking system (eg IR or radar) cease to
track friendly or own aircraft.
breakoff phenomenon Mental state experienced by crews
of high-altitude aircraft and spacecraft of being divorced
from other humanity.
break-out Point at which flight crew receive first
forward visual cues afer an approach through cloud.
breakout force Minimum force required to move pilot’s
flying controls (each axis considered separately). If not
measured at zero airspeed, airspeed must be quoted.
breakout panel One panel in aircraft canopy through
which occupant[s] can escape in emergency.
breakpoint 1 In system responding to high-frequency
input, the corner frequency (as seen on a Bode plot) where
f =1/2Tπ.
2 In EDP, point in program or routine at which, upon
manual insertion of * instruction, machine will stop and
verify progress.
3 Sudden change in slope of graphic plot, eg point at
which payload has to fall from maximum value in plot
against range. Also called knee.
break price Quantity at which unit price changes.
breakthrough propulsion physics NASA project
searching for a way to travel at a significant fraction of the
speed of light.
break-up Separation of single radar blip into discrete
parts each caused by a target.
break-up circuit Electrical circuit linking airborne
portions of break-up system.
break-up shot Artillery shot designed to break into small
fragments upon leaving muzzle and thus travel only a
short distance.
break-up system System designed to break unmanned
vehicle, such as ballistic missile, space launcher or RPV,
into fragments sufficiently small to cause minor damage
if they should fall on inhabited area.
bridge
break X To break (2) at point of minimum range for
launch of own AAM, where X symbol appears on cockpit
display.
breather 1 An open pipe connecting interior of device,
such as piston engine to atmosphere to dissipate moisture
or oil vapour.
2 A centrifuge to which air carrying finely divided lubricating
oil is piped at the start of the return circuit; all oil
is centrifuged out for re-use, the hot air being expelled.
breathing 1 Flow of air and exhaust gas through piston
engine, esp. the way this is limited by constraints of flow
path.
2 Flow of air and/or gas into and out of aerostat in
course of flight.
3 Very small air and oil vapour flow through breather
holes or ducts provided to equalise pressure inside and
outside an engine.
4 Generally, escape of air from all volumes as aircraft
climbs, to be replaced by [usually more humid] air on
descent.
breech In a gun, end of barrel opposite muzzle, through
which shot is normally loaded.
breech-block Rigid metal block normally serving to
insert and withdraw shell cases, resist recoil force on fired
case and seal breech during firing; usually oscillates in line
with barrel axis.
breeches piece Tubular assembly, often shaped like pair
of shorts, serving to bifurcate jetpipe or join two jetpipes
into common pipe.
breeze In Beaufort scale, ranges from light* (4 mph) to
fresh * (24 mph).
Breguet formula Rule-of-thumb formula for giving
flight range of classical aeroplane, and reasonably accurate
for all types of aerodyne; range given by multiplying
together L/D ratio, ratio of cruising speed divided by sfc,
and log e of ratio of aircraft weight at start and finish
expressed as decimal fraction greater than 1. Units must
be compatible throughout.
BREMA, Brema British Radio and Electronic-equipment
Manufacturers Association.
bremsstrahlung Electromagnetic radiation emitted by
fast charged particles, esp. electrons, subjected to positive
or negative acceleration by atomic nuclei. Radiation has
continuous spectra (eg, X-rays).
brennschluss Cessation of operation of rocket, for whatever
cause.
BREO On-board avionics (R).
Brétigny Location, southwest of Paris, of Centre des
Essais en Vol (CEV).
brevet Flying badge worn on uniform, especially
denoting qualification as flight-crew member.
BRF Short approach is required or desired (ICAO).
BRG, Brg Bearing (2).
BRH Bundesrechnungshof [Federal audit office] (G).
BRHZ Mist, haze.
BRI Basic-rate interface.
brick Portable data store which transfers mission data
to aircraft systems (colloq.).
bridge Permanently installed pedestrian connector
linking terminal with aircraft. Almost all are covered, and
provided with powered movement controlled from the
free end. The movement usually includes vertical elevation,
lateral traverse and telescopic linear extension, and
the terminal end may be able to interface with one level
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