the Aviation Dictionary

compressor case - The outer compressor housing,
usually split front to rear or top to bottom. This case
provides support for the stator vanes.
compressor discharge pressure (Pt4) - A measurement
taken at the compressor exit and sent to the fuel control
unit for fuel scheduling purposes.
compressor disk - The inner section of the compressor
to which the blades are attached. A disk assembly is
made up of one segment per stage and bolted together
to form one large rotating piece.
compressor efficiency - A measure of aerodynamic
efficiency, one important factor of which is the ability
to compress air to the maximum pressure ratio with the
minimum temperature rise.
compressor front frame - The compressor inlet case.
compressor hub - The front and rear portion of the
compressor to which the compressor shafts attach.
compressor pressure ratio - The ratio of compressor
discharge pressure to compressor inlet pressure.
compressor stage - 1. Each section of a compressor in
which the air pressure is progressively increased. A
stage of compression consists of one row of blades and
one row of stator vanes in an axial flow compressor. 2.
A rotor blade set followed by a stator vane set. The
rotating airfoils create air velocity, which then changes
to pressure in the numerous diverging ducts formed by
the stator vanes.
compressor stall - In gas turbine engines, a condition in
an axial-flow compressor in which one or more stages
of rotor blades fail to pass air smoothly to the
succeeding stages. A stall condition is caused by a
pressure ratio that is incompatible with the engine rpm.
Compressor stall will be indicated by a rise in exhaust
temperature or rpm fluctuation, and if allowed to
continue, may result in flameout and physical damage
to the engine.
compressor stall-margin curve - A curve showing a
relationship between the compression ratio and mass
air flow that must be maintained for a particular
engine. - If either of the factors goes - out of limits, a
compressor stall results.
compressor case . condition lever
plan as fixes selected to define direct routes. These
points are geographical locations which are defined by
navigation aids1 fixes. Pilots should discontinue
position reporting over compulsory reporting points
when informed by ATC that their aircraft is in "radar
contact."
computer - A device (usually electronic) that receives
information, performs some sort of operation on the
data, and then produces an output.
computer assisted instruction (CAI) - Similar to
computer-based training, except emphasizes the point
that the instructor is responsible for the class and uses
the computer to assist in the instruction.
computer-based instruction (CBI) - Synonymous with
computer-based training. The use of the computer as a
training device.
computer-based training (CBT) - The use of the
computer as a training device. CBT is sometimes called
computer-based instruction (CBI); the terms and
acronyms are synonymous and may be used
interchangeably.
concave surface - An inwardly curved surface.
concentration cell corrosion - A corrosion in which the
electrode potential difference is caused by a difference
in ion concentration of the electroyte instead of a
difference in galvanic composition within the metal.
concentric - Having a common center.
concentric circles - Circles having the same center
point.
concentric shafts - Two shafts having a common axis,
one inside the other.
concurrent lines -- Lines that pass through a common
point.
condensation - The process of changing state from a
vaDor into a liauid.
condensation level - The height at which a rising parcel
or layer of air would become saturated if lifted
adiabatically.
condensation nuclei - Small particles in the air on
which water vapor condenses.
compressor surge - 1. A severe compressor stall across
the entire compressor that can result in severe damage condensation trail (or contrail) -A cloud-like streamer
if not quickly corrected. This condition occurs with a frequently observed to form behind aircraft flying in
complete stoppage of airflow or a reversal of airflow. clear, cold, humid air.
2. An operating region of violent pulsating air flow
usually outside of the operating limits of the engine
condenser - Another name for
2. The
flow control settings. A primary cause is compressor
component in a vapor cycle air conditioning system
blade stall. Surge can result in flameout and, in severe
where heat energy is given up to the air and the
cases, structural damage.
refrigerant vapor is changed into a liquid.
compulsory reporting points - Reporting points which
condition lever - A turboprop cockpit lever. On some
must be reported to ATC. They are designated on
aircraft, it serves as prop control lever for flight (alpha
aeronautical charts by solid triangles or filed in a flight
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