TM 55-1680-320-23 & P
section 2. DEFINITIONS (Cent)
Abnormal movement of a part.
A surface impression with sharp comers or bottom,
usually caused by pressure or impact from a sharp-edged
foreign body. Th e parent material is displaced but
usually none is separated.
The basic metal of a part, sometimes referred to as base
metal; the term is used particularly in connection with
welding, where the parent metal is that being welded
rather than that used in welding rod.
A hole that is pierced in a material.
To restore a defective part, component, subassembly or
assembly to a serviceable condition.
When one component contacts another and is moved in
relationship to it causing material to be removed from
Multiple scratches, usually parallel and resulting from
the same cause.
A long, narrow sharp-cornered impression caused by the
movement of a sharp object across the surface of parent
Equipment or parts that are in a condition which allows
them to be returned to operational status on an air-