the Aviation Dictionary

beads bearing wheel
to form one solid piece when solidified. The bead bearing heater tank - An oil bath heater used to expand
sticks up above the surface of metal that has been a bearing so that it can be hand fitted over its shaft
welded. Usually some additional metal is added to the journal.
weld, in the form of a wire or rod. to build UP the weld
bearing navigation - The horizontal direction of one
seam to a greater thickness than the base metal. The
object in relation to another object.
characteristics of a bead on a good weld are: height
uniformity, a smooth and uniform ripple on its surface, bearing pressurizing - The process of increasing air
and an even blend into the base metal. pressure in the bearing pockets by admitting
beads - On tires, steel wires embedded in rubber and
compressor air.
wrapped in fabric. The beads anchor the carcass plies bearing race - The hardened steel surface upon which
and provide firm mounting surfaces on the wheel.
anti-friction bearings ride.
beam - 1. A supporting structural member in any
construction designed to withstand loads in both shear
and bending. 2. A radio signal sent continuously in one
direction.
beam power tube - An electron tube that utilizes
directed electron beams to add to its power-handling
capability. Beam power tubes are power amplifier
tubes, rather than a voltage amplifier.
beam radio antenna - A directional radio transmitting
antenna that radiates its energy in a narrow beam.
bearing - 1. An angular measurement of direction from
an airplane in flight and a known point. 2. A surface
that supports and reduces friction between moving
parts.
bearing area - The cross-section area of the bearing
load member on a sample.
bearing burnishing - An aircraft engine run-in process
that creates a highly polished surface on new bearings
and bushings installed during overhaul. The burnishing
is usually accomplished during the first periods of the
engine run-in at comparatively slow engine speeds.
bearing cage - A thin sheet-metal separator that holds
the bearing rollers equally spaced around the race. The
cage should not contact either of the races.
bearing cone - The assembly, which consists of a
tapered, hardened steel, cone-shaped bearing race that
fits over the axle, the rollers, and the cage that holds
the rollers in position.
bearing cup - The steel race of a roller bearing that is
shrink-fitted into the bearing cavity of the wheel.
bearing degausser - A device that removes magnetism
- - -
from bearings and other engine components.
bearing failure - The failure of a riveted joint caused by
the sheets tearing at the rivet holes rather than the
rivets shearing.
bearing field detector - A device that detects
magnetism in rotating engine components.
bearing friction - Friction caused by a bearing.
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bearing rollers - Hardened steel rollers that support the
wheel. They roll between a hardened steel, coneshaped
race on the axle and a hardened steel race, the
cup, inside the wheel.
bearing scratch detector - A hand-held ball bearing
tipped tool, which is passed over bearing surfaces. If
the ball finds a depression, the bearing is usually
rejected.
bearing seal - A device used in turbine engines to seal
the lubricating oil in the bearing cavity. Usually located
at main bearings.
bearing stack - A group of thrust-type bearings placed
one on top of the other to form a stack. Primarily used
to allow propeller blades to rotate in the hub under high
centrifugal loads.
bearing strain - In composites, the ratio of the
deformation of the bearing hole, in the direction of the
applied force, to the pin diameter.
bearing strength - The force required to pull a rivet
through the edge of the sheet or to elongate the hole.
The bearing strength of a material is affected by both
its thickness and by the size of the rivet.
bearing stress - In composites, the applied load in
pounds divided by the bearing area.
bearing sump - The compartment housing the engine
main bearings, formed by bearing seals on either side
of the bearing on the shaft. Seals are used to control the
inward leakage of gas path air.
bearing support - The inner hub of a major engine
case, which is supported by struts and houses a main
bearing.
bearing surface - A surface that supports and reduces
friction between moving parts or a moving load.
Bearing surfaces are ordinarily treated in several ways
to decrease the friction between the surface and the
moving load.
bearing wheel - An airplane wheel that has tapered,
roller-type - - bearings - that consist of a bearing - cone,
rollers with a retaining cage, and a bearing cup, or
outer race. Each wheel has the bearing cup, or race,
pressed into place and is often supplied with a hubcap