EXPANSION--The increase in volume of the
gases in a turbine after combustion by which the
speed sensed by a magnetic pickup on the transfer
gearbox of the GTE.
gases continue to turn the rotor while expending
part of its internal energy and losing in pressure
GAS TURBINE GENERATOR SET (GTGS)--
and temperature.
The GTGS has a GTE, a reduction gearbox, and
FEEDBACK --A value derived from a con-
a generator.
trolled function and returned to the controlling
function.
GENERATOR BREAKER (GB)--The GB is
used to connect a generator to its main switchboard.
FEEDWATER --Distilled water made in
evaporators for use in boilers. Feedwater is more
GOVERNOR CONTROL UNIT (GCU)--A
pure than drinking (potable) water.
static GCU is supplied for each GTGS consisting
of a static exciter/voltage regulator assembly, field
FERROUS--Refers to metals having iron as
rectifier assembly, motor-driven rheostat, and mode
the base metal.
select rotary switch. It controls the output voltage
of the generator.
FILTER --(l) A device that removes insoluble
contaminants from the fluid power system. (2) A
HEADER--A piping manifold that connects
device through which gas or liquid is passed; dirt,
several sublines to a major pipeline.
dust, and other impurities are removed by the
separating action.
HEAD TANK--A tank located higher than
other system components to provide a positive
FREE STANDING ELECTRONIC ENCLO-
pressure to a system by gravity.
SURE (FSEE)--The FSEE provides the supporting
electronic and engine control interface between
HERTZ (Hz)--A unit of frequency equal to one
the GTE and the control consoles. One FSEE is
cycle per second.
located in each MER.
HIGH HAT ASSEMBLY--A removable housing
FREQUENCY--The number of cycles (as in
over the main engine air intake ducts that contains
an alternating electrical current) completed per
the moisture separation system (demisters), inlet
second.
louvers, and blow-in doors.
FRICTION --Resistance to the relative motion
of one body sliding, rolling, or flowing over
HORSEPOWER (hp)--A standard unit of
another with which it has contact.
power that equals 550 foot pounds of work per
second.
FUEL SYSTEM CONTROL CONSOLE
(FSCC)--Located in CCS and is the central
HUMIDITY --The weight of water vapor in
station for monitoring and control of the fuel fill
grains per cubic foot of air.
and transfer system.
HYDRAULIC --Conveyed, operated, or
FUEL OIL SYSTEM--This system provides
moved by water or other liquid in motion.
a continuous supply of clean fuel to the GTEs.
HYDRAULIC OIL POWER MODULE
FULL POWER--The condition in which both
(HOPM) --A component located near the MRG
engines (GTEs) in one engine room are engaged
to deliver control oil and high pressure (HP) oil
and driving the reduction gear and propeller shaft.
to an oil distribution box for distribution to the
propeller hub and activation of the pitch control
GAS GENERATOR (GG)--The gas-producing
rod within the shaft.
section of any GTE. It usually has a compressor,
a combustor, a high-pressure turbine, an accessory
IMPELLER --A blade or series of blades of
drive system, and controls and accessories.
a rotor that imparts motion.
GAS TURBINE ENGINE (GTE)--A GTE
INERTIA --Any change in motion being
consists of a compressor, a combustor, a turbine,
measured by the acceleration of the center of
and an accessory drive system. Many variations
mass.
of GTEs exist.
AI-4