KNURLED– A series of small ridges or beads placed
along the edge of a metal object, such as a
thumbscrew, as an aid in gripping.
LAMINA– A single ply of composite material, made up
of a reinforcing element and matrix (laminae–plural
of lamina).
LAMINATE– A combination of two or more single
piles of laminae bonded together to form a structure.
LAMINATE ORIENTATION CODE– A code that
sets the standard of identifying laminate
orientations within the composite industry.
MATRIX– The essentially homogeneous material in
which the fibers of a composite are embedded and
supported.
MICROMETER CALIPER– A caliper having a
spindle moved by a finely threaded screw for
making precise measurements.
MICRON– A millionth of a meter or about 0.000039
inch.
MIM– Maintenance Instruction Manual.
ML– Milliliter.
MM– Millimeter.
MRC– Maintenance requirements card.
NADEP– Naval aviation depot.
NAMP– Naval Aviation Maintenance Program.
NAPI– Naval Aeronautical Publication Index.
NAVAIR– Naval Air Systems Command. Also known
as NA and NAVAIRSYSCOM.
NAVOSH– Navy Occupational Safety and Health
Program.
NDI– Nondestructive inspection.
NEOPRENE– A synthetic rubber.
NONFERROUS– Metals other then iron.
OPTIMUM– The greatest degree attained or attainable
under implied or specified conditions.
OSCILLATION– A flow of electricity changing
periodically from a maximum to a minimum. A
single swing from one extreme limit to the other.
OXIDATION– The process by which oxygen unites
with some other substance, causing rust or
corrosion.
P/N– Part number.
PERIMETER– A line or strip protecting or bonding an
area.
PMIC– Periodic maintenance inspection card.
PNEUMATIC– Moved or worked by air pressure.
POTENTIOMETER– An instrument for controlling,
comparing, or measuring electrical potentials.
PPM– Parts per million.
PSI– Pounds per square inch.
RADIUS– A line segment extending from the center of
a circle or sphere to the circumference or bounding
surface.
RPM– Revolutions per minute.
SAE– Society of Automotive Engineers.
SATURATION– A state of maximum impregnation.
SERRATION– A formation resembling the toothed
edge of a saw.
SILICA– A hard, glassy, mineral found in a variety of
forms, as in quartz, sand, opals, etc.
SPHERICAL– Having the form of a sphere or of one of
its segments.
SPLINE– A key that is fixed to one of two connected
mechanical parts and fits into a keyway in the other.
TEFLON®– A tough, insoluble polymer, used in
making nonsticking coatings and used on gaskets,
bearing electrical insulators, etc.
THERMOPLASTIC– Capable of softening or fusing
when heated and of hardening again when cooled.
TOXIC– Harmful, destructive, poisonous materials.
ULTRASONIC– Having a frequency above the human
ear’s audibility limit.
VISCOSITY– The internal resistance of a liquid that
tends to prevent it from flowing.
WARPAGE– A distortion, such as a twist or bend, in
metal or an object made of metal.
AI-3
