A completely smooth surface depression caused by pressure
or impact from a smooth ball-like foreign object.
ent material is displaced, but usually none is separated.
Twisting or bending out of a normal, natural or original
shape, usually caused from being exposed to excessive pres-
sure or temperature either when restrained or unrestrained.
Wearing away of metal.
Metal band or socket.
Any object such as a tool, piece of equipment or APU part
(nut, bolt, lockwire) that could in any way damage the APU.
Wearing or rubbing of areas, generally used in reference to
damage open wire-braid covering (of teflon hose) or on
A wide rough scratch or group of scratches, usually, with
one or more sharply impressed corners and frequently accom-
panied by deformation or removal of parent metal.
Short, tight twists or curls caused by a doubling or wind-
ing of a hose or line upon itself. Likely to cause diffi-
culties in the operation.
Abnormal movement of a part.
A surface impression with sharp corners or bottom, usually
caused by pressure or impact from a sharp-edged foreign
The parent material is displaced but usually none is