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 as-
sembly to a serviceable condition.
When one component contacts another and is moved in re-
lationship to it causing material to be removed from it.
Multiple scratches, usually parallel and resulting from the
A long, narrow sharp-cornered impression caused by the
movement of a sharp object across the surface of parent ma-
Equipment or parts that are in a condition which allows
them to be returned to operational status on an aircraft.
Testing of equipment to determine that the unit functions
properly within specified limits.
The range of variation allowed in maintaining a specified
dimension in making part.
To tighten a nut, bolt or fitting, using a torque wrench,
to a specified torque value expressed as inch-pounds or as
Relatively slow removal of parent material from any cause,
frequently not visible to the naked eye.