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COE
COE 1 Certification of equivalency (USAF).
2 Co-operative emitter.
3 Common operating environment.
COEA Cost and operational effectiveness analysis.
coefficients Except for next four entries, see under
appropriate characteristics.
Coefficient A In simple magnetic compass, deviations
on cardinal and quadrantal points summed and divided
by 8.
Coefficient B In simple magnetic compass, deviation E
minus deviation W divided by 2.
Coefficient C In simple magnetic compass, deviation N
minus deviation S divided by 2.
coefficient conversion factor Formerly, multiplier
0.00256 required to convert absolute to engineering coefficients.
COEIA Combined operational effectiveness and investment
appraisal (UK 2001).
COF Centrifugal oil filter.
C of A Certificate of Airworthiness.
COFAS Centre d’Opérations des Forces Aériennes
Stratégiques (Taverny, F).
CoFAS Commandement des FAS, same address.
C of C 1 Certificate of Compliance.
2 Change of control.
COFDM Code orthogonal frequency-division multiplexing
(helicopters).
C of E Certificate of Experience
C of F Construction of facilities.
coffin 1 Missile (ICBM) launcher recessed into ground
but not hardened.
2 Symbol which appears in place of a downed aircraft
(ACMR).
C of G See c.g .
C of M Certificate of Maintenance.
C of P See centre of pressure.
C of R Certificate of Registration of aircraft.
COG Component Obsolescence Group [1937–, 160+
member organizations] (UK).
C of T Certificate of test.
cogbelt Flexible belt incorporating teeth to prevent slip.
cognitive model An imagination of a future hardware
item, including a complex system, in the brain of a design
engineer. Software engineers have imagined thousands of
lines of software code before anything has been created
physically.
COGT Centre-of-gravity towing.
coherent Radiation in which, over any plane perpendicular
to direction of propagation, all waves are linked
by unvarying phase relationships (common simplified
picture is of waves ‘marching in step’ with all peaks in
exact alignment).
coherent echo Radar return whose amplitude and phase
vary only very slowly (from fixed or slowly moving
object).
coherent pulse radar, coherent radar Incorporates
circuitry for comparing phases of successive echo pulses
(one species of MTI).
coherent transponder Transmitted pulses are in phase
with those received.
coherer RF detector in which conductance of imperfect
part of circuit (eg iron filings) is improved by received
signal.
cold plug
Cohoe Computer-originated holographic optical
elements.
COI Co-ordinator of Information (US, WW2).
CoI Central Office of Information (UK).
COIAE Colegio Oficial de Ingenieros Aeronauticos de
España [office, E-28041 Madrid] (Spain).
Coil, COIL 1 Chemical oxygen iodine laser.
2 Commercial overhaul information letter (FAA).
coin, Co-In, CO-IN Counter-insurgency; aircraft
designed for guerilla war.
Coincat Community of Interests in Civil Air Transport
(G).
coincidence circuit Gives output signal only when two or
more inputs all receive signals simultaneously or within
agreed time.
COINS, Coins Computer-operated instrument system.
COIS Coastal ocean imaging spectrometer.
Cojas Coherent jammer simulator.
coke Verb, to modify aircraft with Küchemann ‘Coke
bottle’ fuselage.
col In atmosphere isobar field, saddle-shaped region
separating two highs on opposite sides and two lows on
remaining sides.
colander In some ramjet engines, perforated shell
controlling secondary airflow into combustion chamber.
Generally equivalent to gas-turbine flame tube.
cold 1 Without using afterburner.
2 Of a restricted area, not currently active.
cold air mass Colder than surrounding atmosphere.
cold-air unit Air-cycle machine, usually in an ECS,
which greatly reduces temperature of working fluid by
extracting mechanical energy in expansion through a
turbine.
Coldama Co-ordination of loads data acquisition
management.
cold bucket In aft fan with double-deck blades, outer
blades handling cold air.
cold cathode Highly emissive coating and operating at
ambient temperature.
cold-cockpit alert Combat aircraft has no ground power
supplies and is ‘cold’ until pilot enters and initiates start
sequence for engine, gyros and systems.
cold cordite charge Does not detonate but burns to give
high-pressure flow of gas.
cold drawing Drawing workpiece at room temperature.
cold flow test Static test of liquid rocket propulsion
system to verify propellant loading and feeding but
without firing engine(s).
cold front Front of advancing cold air mass moving
beneath and lifting warmer air, esp. intersection of this
front with Earth’s surface.
cold gas Reaction-control jet or rocket using as working
fluid gas released from pressure or monopropellant
decomposed without combustion.
cold launch 1 Launch of missile or other ballistic vehicle
under external impulse, usually from tube (in atmosphere,
in silo or on sea bed) with vehicle’s propulsion fired later.
2 Takeoff of aircraft with INS not aligned.
cold mission Mission or test judged non-hazardous, thus
not interfering with other activities.
cold plate In high-vacuum technology, refrigerated plate
used to condense out last molecules of gas in chamber.
cold plug Spark plug having short insulated electrode
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