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When bogus parts are installed in an aircraft, safety is often compromised.
boiling point. The temperature at which a liquid begins to change into a gas.
The boiling point of a liquid varies with the pressure of the air above it.
The boiling point of water, under standard sea level conditions, is 212°F, or 100°C.
bolt. A threaded fastener which has an enlarged head on one end and threads on the other. Bolts used in
aircraft normally have hexagonal heads, but some high-strength bolts have a round head with a
hexagonal-shaped hole. These special bolts are turned with an Allen wrench.
Bolts fasten pieces of material together by clamping them between the bolt head and a nut screwed
onto the bolt threads.
bomb tester (spark plug tester). A shop tool used to test spark plugs after they have been cleaned and
gapped.
After a spark plug has been serviced, it is screwed into the bomb tester, and about 200-psi air
pressure is applied to the firing end. High voltage is directed into the terminal cavity of the spark plug, and
the electrodes are observed to see the type and amount of spark being produced.
If a spark plug operates properly in a bomb tester, it will almost always work properly when it is
installed in an aircraft engine.
bomber. A military aircraft designed to carry a bomb load over enemy territory and release it in such a way
that it will do the maximum amount of damage.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 83
bond (chemical force). The strong attractive force that holds the atoms together in a molecule.
bonded structure. Aircraft structure joined together by chemical methods, rather than mechanical
fasteners.
Components made of laminated fiberglass, honeycomb material, and the advanced composite
materials are examples of aircraft bonded structure.
Bonderizing. The registered trade name for a patented process of coating steel parts with a phosphate film.
Bonderizing protects the parts from corrosion.
bonding (electrical). The process of electrically connecting all isolated components to the aircraft structure.
Bonding provides a path for return current from the components and provides a low-impedance path to
ground to minimize radio interference from static electrical charges collected on the component.
Shock-mounted instrument panels have bonding braids connected across the shock mounts, so that
return current from the instruments can flow into the main structure and thus return to the alternator or
battery.
bonding (structural). A method of joining parts by using chemical adhesives, rather than any form of
mechanical fastener.
bonding agent (structural). An adhesive used to bond together materials used in aircraft construction.
bonding jumper (electrical systems). A low-resistance wire or metal strap used to connect a structural
component or an electrical component to the basic structure of an aircraft. Bonding jumpers carry the return
current from an electrical component back to the battery.
Small bonding jumpers connect flight control surfaces to the main structure to carry static
electrical charges that build up when air flows over the surface into the main structure. Bonding prevents
sparks that could cause radio interference.
Boolean algebra (mathematics). A system of mathematical logic used to permit computations to be
performed by binary electrical circuits.
Gates such as AND, OR, NAND, NOR, and EXCLUSIVE OR are used to make electrical models
of the Boolean algebraic functions.
boost (manifold pressure). A term for manifold pressure which has been increased above atmospheric
pressure by a supercharger.
boost charge (batteries). A constant-voltage charge given to a partially discharged storage battery for a
short period of time.
boost pump (aircraft fuel system component). An electrically driven centrifugal pump mounted in the
bottom of the fuel tanks in large aircraft.
Boost pumps are used to provide a positive flow of fuel under pressure to the engine for starting
and to serve as an emergency backup in the event the engine-driven pump should fail. They are also used to
transfer fuel from one tank to another and to pump fuel overboard when it is being dumped.
Boost pumps maintain pressure on the fuel in the line to the engine-driven pump to prevent a
vapor lock forming in these lines.
Centrifugal boost pumps have a small agitator propeller on top of the pump impeller. This agitator
causes the vapors in the fuel to be released before the fuel leaves the tank.
boost venturi. A small, auxiliary venturi whose discharge is located in the throat of a larger venturi.
Boost venturis increase the pressure drop produced by the main venturi. They are installed in such
　
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