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shop, head.
bucking voltage. A voltage used to oppose another voltage. When one voltage is bucked by another which
has the same value but opposite polarity, the result is zero voltage.
buckle (sheet metal damage). A wrinkle or kink in the surface of a sheet metal aircraft structure caused by
an excessive bending or compressive load on the structure.
buffer (digital electronic component). A digital electronic component that has one input and one output,
with the output having the same condition as the input. A buffer is used to isolate an input or strengthen a
signal.
buffer amplifier (electronic circuit). An amplifier used to isolate one circuit from another circuit. Buffer
amplifiers prevent one circuit from loading the other and causing it to operate improperly.
buffet (aerodynamic force). Turbulent movement of the air over an aerodynamic surface. Buffeting can
cause flight control problems ranging from a vibration, or buzzing, felt in the controls, to a complete loss of
control.
bug (instrument marker). A movable marker on a flight instrument that may be set to reference a
particular indication of the instrument. A bug on the airspeed indicator can be set to reference a particular
airspeed for the pilot or the airspeed-hold function of an autopilot to hold.
A bug on the horizontal situation indicator can be used to direct the automatic pilot to turn to and
hold the heading on which the bug is set.
bug (malfunction). A commonly used term for anything that prevents a system or component functioning
as it should. This term has gained much use in the field of computer programs in which some small error
can keep the program from working. Most newly written programs must be debugged before they work as
they should.
bug light (aircraft maintenance tool). A handy tool for rough troubleshooting an aircraft electrical system.
A bug light has a flashlight bulb and batteries to check for continuity in the aircraft wiring, and a bulb of
the proper voltage to check for the presence of voltage in the part of the system being examined.
build-up and vent valve (liquid oxygen system). A manually operated valve on a liquid-oxygen converter
used to control the amount of pressure inside the converter. When the valve is in the build-up position,
pressure inside the converter is allowed to build up to a preset value. When the valve is moved to the vent
position, gaseous oxygen is vented into the atmosphere without building up pressure.
bulb angle (aircraft structural material). An L-shaped metal extrusion having an enlarged, rounded edge
that resembles a bulb on one of its legs. A bulb angle is used to provide stiffness to a structure, while
keeping the weight to a minimum.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 93
bulb root (turbine blade attachment method). A rounded end on a turbine blade that mates with a
rounded hole in the periphery of the turbine disk, or wheel. Bulb-root blades are loose when the wheel is
cold to allow for different rates of expansion between the blades and the wheel, while holding the blade
against the centrifugal loads. Other types of blade roots are the dovetail and the fir-tree.
bulk cargo. Cargo capable of being stacked on the floor of the aircraft carrying it.
bulkhead. A structural partition that divides the fuselage of an aircraft into compartments or bays. A
bulkhead strengthens the structure and acts as a wall.
bumping (sheet metal forming method). A method of shrinking or stretching sheet metal into compound
curves by hand-hammering it into a sandbag or into or around wood or metal forming blocks.
bundled cable. An electrical cable made up of individually insulated wires. A bundled cable is tied
together with lacing cord or with special plastic wire-wrapping straps.
bungee cord. An elastic cord made of a series of small strips of rubber or rubber bands. These strips or
bands are encased in a braided cloth cover that holds and protects the rubber, yet allows the rubber to
stretch. Bungee cords are used in some of the simpler aircraft landing gears to absorb shock, and the energy
in a stretched bungee cord may be used to crank a large aircraft reciprocating engine.
buoyancy. The uplifting force produced on an object when it is placed in a fluid. If a block of wood is
placed in a container of water, the wood will displace some of the water, and the water on the outside of the
block will push against it. The buoyancy, or the force with which the water pushes on the block, is the same
as the weight of the water displaced by the block.
When the block floats, it displaces, or takes the place of, its own weight of water.
burble (aerodynamic turbulence). Turbulence which forms on an airfoil surface when the angle of attack
　
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