APPENDIX I
GLOSSARY
ANTI-ICING --A system for preventing
ADIABATIC--To occur without loss or gain
buildup of ice on the gas turbine intake systems.
of heat by the substance concerned.
ATMOSPHERE --A unit of measure equal to
AERODYNAMICS--A branch of dynamics
14.696 psi or 29.92 inches of mercury (1 atmos-
that deals with the motion of air and other gaseous
phere = 14.696 psi).
fluids and the forces acting on bodies in motion
relative to such fluids.
ATMOSPHERIC PRESSURE--The pressure
of air at sea level, about 14.7 psi.
ALARM ACKNOWLEDGE--A push button
that must be depressed to silence an alarm.
AUTOMATIC PARALLELING DEVICE
(APD)--The APD automatically parallels any
ALLOY--Any composition metal produced
two generators when an auto parallel command
by the mixing of two or more metals or elements.
is initiated by the EPCC.
AUXILIARY CONTROL CONSOLE (ACC)--
ALTERNATING CURRENT (ac)--An elec-
The console in CCS used to monitor the auxiliary
trical current that constantly changes amplitude
systems on FFG-class ships.
and polarity at regular intervals.
AXIAL FLOW--Air flow parallel to the axis
AMBIENT TEMPERATURE--The surrounding
of the compressor rotor.
temperature, such as the air temperature that
surrounds a conductor in a compartment or piece
BABBITT --A white alloy of tin, lead,
of equipment.
copper, and antimony that is used for lining
AMBIENT PRESSURE--The surrounding
pressure, such as the air pressure that surrounds
BAFFLE --A plate, wall, or screen used to
a conductor in a compartment or piece of
deflect, check, or otherwise regulate the flow of
equipment.
a gas, liquid, sound waves, and so forth.
BATTERY--A device for converting chemical
AMPERE (amp)--A unit of electrical current
energy into electrical energy.
or rate of flow of electrons. One volt across 1 ohm
of resistance causes a current flow of 1 ampere.
BLEED AIR--Air bled off the compressor
stages of the GTEs. See BLEED AIR SYSTEM.
ANALOG SIGNAL--A measurable quantity
that is continuously variable throughout a given
BLEED AIR SYSTEM--This system uses as
range and that is representative of a physical
its source compressed air extracted from the
quantity.
compressor stage of each GTE or GTG. It is used
for anti-icing, prairie air, masker air, and LP gas
ANALOG-TO-DIGITAL CONVERSION
turbine starting for both the GTEs and GTGs.
(A/D or ADC)--A conversion that takes an
BLOW-IN DOORS--Doors located on the
analog in the form of electrical voltage or
high hat assembly designed to open by solenoid-
current and produces a digital output.
operated latch mechanisms if the inlet airflow
becomes too restricted for normal engine
ANNULAR--In the form of or forming a
operation.
ring.
AI-1
