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CRCO
CRCO Central Route Charges Office (ICAO).
CRD 1 Controller, Research & Development (MAP,
WW2).
2 Current routing domain.
CRDA Cooperative research and development agreement
(FAA).
cRDC Common remote data concentrator[s].
CRD/F Cathode-ray direction-finding; ground D/F
receiver in which aerial automatically rotates to null
azimuth as soon as pilot transmits, bearing being instantly
shown on circular display.
CRE 1 Command-readiness exercise.
2 Communications radar exciter.
3 Control and reporting element.
4 Central Reconnaissance Establishment (RAF,
formerly).
creamed Shot down, destroyed (colloq.).
creamer A perfect landing.
creamy A pilot diverted from normal career [creamed
off], either put into a career holding pattern or “promoted
sideways” (RAF).
Create Homeland Security Center for Risk and
Economic Analysis of Terrorism Events [University of S
California] (US).
credible Of deterrent, demonstrably capable of being
used and having desired effect; depends on its ability to
penetrate and on government’s resolution.
credit Unit of aerial victory scores made up of aircombat
plus strafing (aircraft destroyed on ground), with
fractions for targets shared (US).
creep 1 Slow plastic deformation under prolonged load,
greatly accelerated by high temperatures.
2 Gradual rotation of tyre around wheel; hence *
marker, white index marks on wheel and tyre initially in
alignment.
3 Slow taxi under idle power
4 See next.
creepback Tendency of bombs to fall progressively
further back in front of target (RAF Bomber Command).
creeping landing Landing by jet-lift STOVL aircraft
with just enough forward speed to avoid reingestion of hot
gas or debris from unpaved surface.
creeping line ahead search This covers an area by flying
repeated parallel tracks sufficiently close together that an
object of interest is unlikely to be missed.
creeping wave EM [especially radar] wave attached to
the surface of a solid body.
creep life Safe service life of turbine rotor blades,
normally set at or near point at which elongation ceases
to be proportional to time.
creep strength Stress that will produce specified elongation
over given period (typically 0.1% over 1,000 h) at
given temperature.
CRES, Cres Corrosion-resistant steel.
crescent wing Has progressive reduction in both t/c
radio and sweep angle from root to tip, usually in discrete
stages.
Crest 1 Comprehensive radar effects simulator trainer.
2 Consolidated reporting and evaluating subsystem,
tactical.
3 Crew escape technology.
cresting Ceremonial admission to exclusive group, such
as Blue Angels (USN).
crevice corrosion Initiated by presence of crevice in
Critical Design Review
structure in which foreign material may collect; eliminated
by modern structural coating and assembly
methods.
crew Divided into flight * to fly aircraft, mission * to
carry out other duties in flight, cabin * to minister
to passengers and, arguably, instructors; all assigned to
these duties by appropriate authority.
crew duty time Measured from reporting for duty to
completion of all post-flight duties.
crewing 1 Make-up of flight crew by trade or appointment.
2 Make-up of flight crew by individual rostered names.
crew ratio Number of complete air crews authorised per
line aircraft (civil) or per aircraft in unit complement
(military).
crew resource management Ever-refined improvement in
in-flight [airline] crew behaviour, esp. in flight-deck and
cabin communications, esp. in crisis.
crew return vehicle Lifting-body vehicle, with final
descent by inflatable wing, to bring ISS crew of six back
to Earth.
crew room Room reserved for (usually military) flight
crews, some on standby and others relaxing after
a mission, where publications are kept and notices
promulgated.
crew trainer Aircraft designed to train whole flight crew,
esp. of traditional military aircraft requiring several
flight-crew trades: pilot/navigator/bombardier/signaller/
engineer/gunner.
CRFMU Cabin radio-frequency management unit
[ensures passenger phones do not cause RF interference].
CRG Contingency Response Group (USAF).
crib Shop-floor container for small tools, parts or
material other than scrap.
CrIMSS Cross-track IR microwave sounder system.
CRIP Coat-rod inches per passenger.
crisis management Management of military (war or
near-war) situations or of civil crises such as major accidents
or natural disasters.
CrIS Cross-track IR sounder.
Crisp, CRISP 1 Contra-rotating integrated shrouded
propfan.
2 Computer-reconstructed images from space
photographs.
3 Compact reconfigurable interactive signal processor.
Crista Cryogenic infrared spectrometer telescope for
the atmosphere.
CRIT Centre de Recherches Industrielles et Techniques
(F).
critical altitude 1 The highest density altitude which a
supercharged piston engine can maintain its maximum
continuous rated power.
2 See decision height.
critical angle 1 Angle from local vertical at which radio
signals of given frequency do not escape through ionosphere
but just return to Earth.
2 Incorrectly used to mean stalling angle of attack.
critical case That combination of failures (of propulsion,
flight controls or systems) giving worst performance
(see critical engine).
critical crack One of * length.
Critical Design Review Almost self-explanatory, the
CDR immediately follows the stage of detailed design of
hardware and software, and is the last opportunity to
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