Bell OH-58A Technical Manual page 322

TM 55-1520-228-BD
GLOSSARY
SPALLING
SPANWISE
SPAR
STIFFENER
STOP HOLE
STRINGER
TEST
TOLERANCE
TOXIC
TWIST
VISCOSITY
WARPAGE
WEB
WHIP
GLOS-8
GLOSSARY (Cont)
Chipped or flaked surface caused by the breaking away of
the hardened metal and separation of the case from the
core.
The location of a point or direction of movement parallel
to the leading or trailing edge of a rotor blade.
A primary structural element designed to carry weight
and resist bending loads in wings and rotor blades.
Spars typically extend the full length of the wing, and
taper down to a smaller cross section toward the tip
of the wing.
A longitudinal (fore and aft) structural element use in
semimonocoque design which stiffens the skin.
called a stringer.
A hole intentionally drilled at the end of a crack, or saw
cut which normally will prevent further propagation
of the crack.
A longitudinal (fore and aft) structural element used in
semimonocoque design which stiffens the skin.
called a stiffener.
As used herein, the checking or operation of equipment
to determine that the unit functions properly within the
limits set forth in this manual.
The difference between two limiting sizes as a
means of specifying the degree of accuracy.
A poisonous substance.
The damage of a structural element by turning or torque
forces causing permanent deformation.
The property of a fluid that tends to resist the force
trying to make it flow such as gravity or applied
pressure.
The bending or twisting damage causing a structural
element to weaken and permanently loose its original
shape.
The sheet metal membrain connecting the upper and lower
flanges of a beam or spar.
the airframe structure.
The tendency of a bent shaft to rotate away from its
original center as the shaft RPM is increased, thus
causing severe vibration.
Provides overall rigidity to
Often
Often