MANUAL BUS TRANSFER (MBT).-- Provides
GROUND.-- (1) A metallic connection with the earth to
selection between normal and alternate power
e s t a b l i s h ground potential. (2) The voltage
sources for selected equipment. This transfer switch
reference point in a circuit. There may or may not
is used for controllers with low voltage protection
bean actual connection to earth, but it is understood
that requires manual restarting after voltage failure
that a point in the circuit said to be at ground
and for electronic power distribution panels.
potential could be connected to earth without
disturbing the operation of the circuit in any way.
M A I N R E D U C T I O N G E A R ( M R G ) . -- A gear
HERTZ (Hz).-- A unit of frequency equal to one cycle
arrangement designed to reduce the rpm output of
per second.
the GTE and drive the propeller shaft.
HORSEPOWER (hp).-- A standard unit of power that
MAIN FUEL CONTROL (MFC).-- A hydro-
equals 550 foot-pounds of work per second.
mechanical device on the propulsion GTE that
HYDRAULIC.-- Conveyed, operated, or moved by
water or other liquid in motion.
deceleration fuel flow, and stator vane angle for
stall-free, optimum performance over the operating
IMPELLER.-- A blade or series of blades of a rotor that
range of the GTE.
imparts motion.
INTERIM INTEGRATED ELECTRONIC
MAINTENANCE INDEX PAGE (MIP).-- A basic
C O N T R O L (IIEC).-- The IIEC provides the
PMS reference document prepared and issued for
supporting electronic and engine control interface
each installed system/equipment for which PMS
between the GTE and the control consoles.
support has been established.
ISOCHRONOUS MODE.-- This mode is normally
MAINTENANCE REQUIREMENT CARD
used for generator operation. This mode provides a
(MRC).-- A card that provides detailed procedures
constant frequency for all load conditions. When
for performing maintenance requirements and tells
two (or more) generators are operated in parallel,
who, how, and with what resources a specific
the isochronous mode also provides equal load
requirement is to be accomplished.
sharing between units.
MARINE GAS TURBINE SERVICE RECORDS.--
JP-5.-- The primary type of fuel used for helicopters and
A comprehensive equipment service record that
small boats. The emergency source of fuel for the
provides a history of operation, maintenance, and
GTEs and GTGs.
configuration changes to gas turbine equipment.
KILOWATT.-- A unit of electrical power equal to 1000
watts. (A watt is a unit of power equal to the rate of
MASKER AIR SYSTEM.-- TMS system disguises the
work represented by a current of 1 ampere under a
sound signature of the ship and alters transmission
pressure of 1 volt.)
of machinery noise to the water by emitting air from
small holes in the emitter rings on the ship's hull.
L O A D S H E D D I N G . -- Protects a generator from
overloading by automatically dropping preselected
loads when generator output reaches 100 percent.
hand-driven generator as a direct voltage source,
LOCAL CONTROL PANEL (LOCOP).-- T h e
used for measuring insulation resistance values and
LOCOP is the local operating station for the SSGTG
other high resistances.
on the CG-, DD-, and DDG-class ships. It is located
in the MER near the SSGTG.
MILLIAMPERE.-- One one-thousandth (0.001) of an
ampere. Abbreviated mA.
LOCAL OPERATING PANEL (LOP).-- The LOP is
t h e local operating station for GTEs on the
MOTOR.-- A device that moves an object. Specifically,
FFG-class ships. It is located in the MER and is used
a machine that converts electric energy into
primarily for maintenance.
mechanical energy.
MACHINERY CONTROL SYSTEM (MCS).--
MULTIPLEXING.-- The process of combining several
Provides centralized and remote monitoring and
measurements for transmission over the same signal
control of propulsion, electrical, auxiliary, and
path .l
damage control systems of the DDG-51 class ships.
AI-4
