N A C E L L E -- A streamlined structure,
LAMINATE--A combination of two or more
housing, or compartment on an aircraft; for
single plies of laminae bonded together to form
example, a housing for the engine.
NAVOSH--Navy Occupational Safety and
L A M P S -- L i g h t Airborne Multipurpose
NOAP--Navy Oil Analysis Program.
L A T E R A L -- T h e width dimension; for
example, the lateral axis of an aircraft runs
NOTE--An operating procedure, practice, or
lengthwise from wing tip to wing tip.
condition, etc., that is essential to emphasize.
LONGITUDINAL--The lengthwise dimen-
O C C U P A T I O N A L STANDARDS--The
sion; for example, the longitudinal axis of an air-
minimum requirements for rating and rate, as set
craft runs lengthwise from the nose to the tail.
forth by the Chief of Naval Personnel.
MACH--A number indicating the ratio of the
OXIDATION--In general, the process where
speed of an object to the speed of sound in the
oxygen is added to a compound. The oxidation
medium through which the object is moving.
process in petroleum may lead to gum or resin
MASS--The amount of fundamental matter
of which an object is composed.
OXIDE--A compound containing oxygen and
one or more elements.
MATTER-The substance or substances of
PLENUM CHAMBER--A chamber in which
which all physical objects consist or are composed.
the gas or air pressure is greater than atmospheric
MAY AND NEED NOT--Terms indicating
that the application of a procedure is optional.
POSITIVE DISPLACEMENT--The term
used for oil, fuel, and hydraulic pumps that
MICA--Any member of a group of minerals,
deliver more fluid to the system than is actually
hydrous disilicates of aluminum with other bases,
that separate readily into thin, tough, often
PPB--Power plants bulletin.
MICRON--A millionth of a meter or about
PPC--Power plants change.
P R E S S U R E DIFFERENTIAL--The dif-
ference or ratio between input and output
MIL-H--Military hydraulic fluids.
PRESSURE--The amount of force
distributed over each unit of area. Pressure is
expressed in pounds per square inch (psi).
PROPAGATION--The act of transmitting
and controlling heat in a flame.
MOLECULES--The smallest physical units
PROPORTIONAL--Having the same or
o f an element or compound.
constant ratio or relation.
PSE--Peculiar support equipment.
N--Abbreviation for speed or rpm. When
used with other letters, it indicates the speed of
PSI--Position sensitive indicator. Pounds per
speed and Nf for power turbine or fan speed.