LEFT-HAND RULE--(1) For generators: If
MAIN FUEL CONTROL (MFC)--A hydro-
the thumb, first finger, and second finger of the
mechanical device on the propulsion GTE that
left hand are stretched at right angles to one
another, with the thumb representing the direction
deceleration fuel flow, and stator vane angle for
of motion, the first finger representing the direc-
stall-free, optimum performance over the
tion of magnetic lines of force, and the second
operating range of the GTE.
finger representing the direction of electron flow,
the relationship between the directions will then
MAIN REDUCTION GEAR (MRG) AS-
be correct for a conductor in the armature of a
SEMBLY--A locked train, double reduction gear
generator. (2) For a current-carrying wire: If the
designed to reduce the rpm output of the GTE
fingers of the left hand are placed around the wire
and drive the propeller shaft.
in such a way that the thumb points in the direc-
tion of electron flow, the fingers will be pointing
MANUAL BUS TRANSFER (MBT)--The
MBT provides for manual selection between
in the direction of the magnetic field.
normal and alternate power sources.
LIQUID FUEL VALVE (LFV)--This valve
meters the required amount of fuel for all engine
MASKER AIR SYSTEM--This system
operating conditions for the Allison 501-K17
disguises the sound signature of the ship and alters
GTE.
transmission of machinery noise to the water by
emitting air from small holes in the emitter rings
LOAD SHEDDING--Protects a generator
on the ship's hull.
from overloading by automatically dropping
preselected loads when generator out put reaches
MASS--The measure of the quantity of
100 percent.
matter contained in a body.
LOCAL CONTROL--Start-up and operation
MILITARY STANDARDS (MILSTDs)--A
of equipment by manual controls attached to the
formalized set of standards for supplies, equip-
machinery, or by an electric panel attached to the
ment, and design work purchased by the United
machinery or located nearby.
Stat es Armed Forces.
LOCAL OPERATING PANEL (LOP)--The
MOMENT ARM--The length of a torque
LOP is the local operating station for GTEs on
wrench from the center of pivot to the point where
the FFG-7 class ships. It is located in the MER
force is applied.
and is used primarily for maintenance.
MONITORING POINT--The physical loca-
LOCKED TRAIN--A designation applied to
tion at which any indicating device displays the
a reduction gear set where when one gear is
value of a parameter at some control station.
turned, all gears in the set will turn.
MOST REMOTE BEARING--The bearing
LOGIC--A method for describing the existing
located at the hydraulically most remote point in
condition of circuits and devices that can remain
the system.
at only one of two opposite conditions at a
particular time, such as ON or OFF, UP or
MOTOR-- (l) A rotating machine that
DOWN, IN or OUT.
transforms electrical energy into mechanical
energy. (2) An actuator that converts fluid power
LUBE OIL STORAGE AND CONDITION-
ING ASSEMBLY (LOSCA)--The LOSCA is
to rotary mechanical force and motion.
mounted remotely from the GTM and is a unit
with a lube oil storage tank, a heat exchanger, a
MOTOR CONTROLLER--A device or
group of devices that governs, in some pre-
scavenge oil duplex filter, and a scavenge oil check
determined manner, the operation of the motor
valve (all mounted on a common base). Its
to which it is attached.
function is to provide the GTM with an adequate
supply of cooled, clean lube oil. It also has
MULTIPLEXING-- A system of transmitting
instrumentation for remote monitoring of oil
temperature, filter differential pressure, and
two or more messages or signals over a common
high/low tank level alarm.
circuit.
AI-8
