1Dk4eXg

component life
component life Authorised period of usage without
attention, as stipulated by manufacturer or other
authority. At expiry may be discarded or overhauled.
Period may be extended from time to time.
components tree Notional “tree” formed by interlinking
of aircraft systems, highlighted in CBT by ability to strip
aircraft layer by layer.
composite aircraft 1 Comprising two aircraft joined
together at take-off [see component (5)] but separated later
in flight.
2 Aircraft made principally of composite material(s).
composite air picture Fed from many sources to give
giant hi-resolution monitor with many overlays
controlled by keyboards, mice and trackballs.
composite beam Composed of dissimilar materials
bonded together.
composite cloud Combination of, or intermediate
between, basic forms, eg cirro-cumulus.
composite construction See composite material.
composite cooling Evaporative cooling.
composite double-base Solid rocket filling of combined
double-base and composite types (eg AP (2) + AlP in
matrix of NC + NG).
composite flight plan One specifying VFR for one or
more portions and IFR for remainder.
composite flying Long-range navigation along great
circle but modified (eg to avoid high mountains) by
inserting sectors using other methods.
composite launch Single launch vehicle carrying two or
more distinct payloads.
composite material Structural material made up of two
or more contrasting components, normally fine fibres or
whiskers in a bonding matrix. Unlike an alloy, usually
anisotropic.
composite power See mixed power.
composite propellant Solid rocket filling comprising
separate fuel and oxidiser intimately mixed.
composite route One where composite separation is
authorised.
composite separation Reduction [usually to half normal]
of lateral and vertical minima on oceanic routes meeting
criteria.
compound aerofoil Not defined, but has been applied to
wing whose trailing edge comprises separately hinged
upper and lower sub-aerofoils leaving controllable gaps.
compound aircraft Having wing(s) and lifting rotor(s).
compound balance Compound shelf.
compound curvature Sheet or surface curved in more
than one plane, thus not formable by simple bending.
compound die Performs two or more sheet-forming
operations on single stroke of press.
compound engine Expands working fluid two or more
times in two or more places, eg in HP and LP cylinders or
in piston engine followed by gas turbine or blow-down
exhaust turbine.
compound helicopter Having propulsion (usually
turbofan or turbojet) in addition to thrust component of
lifting rotor.
compound shelf Control surface comprising two [rarely,
three] spanwise sections hinged together one behind the
other and moving in opposition. LE of main [front]
section normally has fabric seal to fixed surface.
compound stress Not simple tension/compression,
compressor blade
torque, bending or shear but combination of two or more
of these.
compound taper Outer wing is tapered more or less
sharply than inboard.
compound wing Wing made up of major fixed portion
and upper/lower rear foils, with or without blowing
between them. Also called multi-foil section. T/c up to
30% has been achieved at high MD.
compressed-air starter Expands HP airflow through
piston engine cylinders or ATM or turbine-blade impingement
jet. In multi-engined aircraft cross-bleed can start
second and subsequent engines.
compressed-air tunnel Closed-circuit tunnel filled with
gas or air under pressure; can be smaller, and cheaper to
run, than one at atmospheric pressure for given M and R.
compressibility In aerodynamics, phenomena manifest
at speeds close to local sonic speed, when air can no longer
be regarded as incompressible. Loosely, behaviour of
airflow subject to pressure/density changes of 50 per cent
or more of free-stream values.
compressibility correction From RAS to EAS (see
airspeed).
compressibility effects Manifest as local speed, at peak
suctions, exceeds that of sound in surrounding flow;
include abnormally rapid increase in drag, rearward shift
of CP (2) on lifting wings, appearance of shockwaves,
tendency to boundary-layer breakaway and, in improperly
designed aircraft, control buzz and other more
severe losses of stability and control.
compressibility error Manifest in all instrument readings
derived from simple pitot/static system at high subsonic
Mach numbers; typically, progressive under-reading until
pressure and static orifices have penetrated bow shock.
compressibility factor See Glauert.
compressibility stall Rapid and dramatic loss of lift of
traditional [e.g., thick-section] wing when Mach numbers
exceeds about 0.8. Also called shock stall. Not relevant to
wings designed for supersonic flt.
compression Control of signal gain, esp. to increase it for
small signal voltages and reduce it for large.
compression ignition Combustion of fuel/air mixture
triggered by high temperature due to compression in
diesel cylinder or in highly supersonic ramjet with suitable
internal profile.
compression lift Lift gained at supersonic speed by
favourable flow field by forcing flow to accelerate beneath
wing (accentuated by down-turned wingtips).
compression pressure Gauge pressure in piston engine
cylinder at TDC (in absence of combustion).
compression ratio Ratio of entrapped volume above
piston at BDC to volume at TDC.
compression rib Provided inside fabric-covered wing to
withstand tension of drag bracing.
compression ring(s) Top ring(s) on piston, of plain
rectangular section, serving to seal mixture into combustion
space on compression stroke.
compression wave See blast wave.
compressor Machine for compressing working fluid (see
axial *, centrifugal *, skew *, Roots *, positive-displacement
*). In general, term used for device handling large
mass flow at moderate pressure (say, up to 40 ata,
400 kPa); small flow at high pressure = pump.
compressor blade 1 Loosely, rotor blade or stator vane
in axial compressor.
157