TM 55-2840-254-23
GLOSSARY (Continued)
Definition
C (Continued)
Converging . . . . . . . . . . . . . . . . . . . . . . . . . . Tending to move toward one point or another.
Convex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A surface shaped Iike the outside of a sphere or a ball.
Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . A mass of small pits which cumulatively create a large cavity
(usually shallow) in the surface of the parent metal.
Corrosion Pitting . . . . . . . . . . . . . . . . . . . . . Irregular surface depressions having ragged edges due to
metal removal caused by corrosive substance adhering to
exposed surfaces.
Corrugated . . . . . . . . . . . . . . . . . . . . . . . . . . The forming and shaping of sheet metal into wrinkles or
folds or into alternating ridges and grooves.
Crack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parting of parent metal.
D
Dent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A completely smooth surface depression caused by pressure
or impact from a smooth ball-like foreign object. The par-
ent material is displaced, but usually none is separated.
Desiccant . . . . . . . . . . . . . . . . . . . . . . . . . . . A drying agent; usually placed in containers along with parts
being stored, to absorb moisture and prevent corrosion.
Diagnostic Equipment . . . . . . . . . . . . . . . . . Test equipment used to determine what the defective part is.
Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
F
Fatigue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The progressive weakening of a material under repeated
cycles of stress.
Foreign Material . . . . . . . . . . . . . . . . . . . . . . See Contamination.
Foreign Object . . . . . . . . . . . . . . . . . . . . . . . Any object such as a tool, piece of equipment, engine part
(nut, bolt, Iockwire) that could in any way damage the
engine.
Fraying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wearing or rubbing of areas, generally used in reference to
damage on wire-braid covering (of teflon hose) or on ther-
mocouple harness.
Glossary-2
