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combat mission
(includes guns/ammunition but excludes radars,
lasers/receivers and drop tanks carried for propulsion).
combat mission Mission flown by balloon, airship, kite,
aeroplane, helicopter or other aircraft such that it may
expect to encounter enemy land, sea or air forces.
combat persistence Ability of fighter aircraft to engage
numerous successive targets, by virtue of large number of
AAMs carried.
combat plug Manual control of fighter engine permitting
TET limit to rise to new higher level for period of
emergency (typically 30 sec to 3 min).
combat radius Radius of action.
combat spread Variable loose formation affording best
visual lookout.
combat tank External jettisonable fuel tank used on
combat missions; possibly smaller than ferry tank.
combat thrust loading Thrust loading assumed for
fighter in typical combat.
combat trail Combat aircraft, usually interceptors, in
loose trail formation, maintaining position visually or by
radar.
combat wing loading Wing loading assumed for fighter
in typical combat.
combat zone 1 Geographic area, including airspace,
required by combat forces for conduct of operations.
2 Territory forward of army rear boundary.
combi, Combi Transport aircraft with main deck
furnished for both passenger and freight (from ‘combination’).
Proportion devoted to freight usually variable.
combination Tug and glider, before separation.
combination aircraft Combi.
combination propulsion See mixed-power aircraft.
combination slide Escape slide designed for subsequent
use as life raft.
Combined Involving armed forces of two or more allied
nations. Thus * common user item, * forces, * staff etc.
combined arms gateway environment Complete mission
planning from a single laptop.
combined display Presents information from two or
more sources, usually radar superimposed on movingmap
display.
combined-effects munition One having anti-armour,
anti-personnel and incendiary effects.
combined sight Weapon-aiming device able to operate in
more than one mode, eg optical and thermal imaging.
combined stresses Two or more simple stresses acting
simultaneously on same body.
combiner Optical element in HUD for aligning, collimating
or focusing at infinity all displayed elements on
single screen.
combining gearbox Reduction gearbox driven by two or
more engines or [e.g.] surface power units, and driving
single or contra-rotating propeller or lifting rotor.
Combre See CMBRE.
COMBS Contractor-operated and managed base
supply, ie manufacturer of major system manages and
maintains government-owned GSE and spare parts and
carries out heavy maintenance.
combustion Chemical combination with oxygen
(burning).
combustion chamber 1 In piston engine, space above
piston(s) at TDC, arguably extended over part of stroke
depending on progress of flame front.
2 In gas turbine, entire volume in which combustion
command dot
takes place, including that outside flame tube(s) occupied
by dilution air.
3 In liquid rocket or ramjet, entire volume in which
combustion takes place, bounded by injector face, walls
of chamber and plane of nozzle throat (not nozzle exit).
4 In solid or hybrid rocket, inapplicable.
combustion efficiency Ratio of energy released to potential
chemical energy of fuel, both usually expressed as a
rate.
combustion ratio Ratio of fuels or propellants actually
achieved; in case of fuel/air usually termed mixture ratio.
combustion ring Combustion chamber of annular (eg
Aerospike) liquid rocket engine.
combustion space See combustion chamber (1).
combustion starter Gas-turbine engine-start energised
by burning fuel, either fuel/air, monopropellant (eg
Avpin) or solid cartridge. Some purists add “within a
cylinder”.
combustion test vehicle Free-flight vehicle (RPV or
missile) whose purpose is test or demonstration of propulsion
performance.
combustor 1 See combustion chamber (2).
2 Combustion chamber (2) together with fuel manifolds,
injectors, flameholders and igniters.
3 Rarely, afterburner burning region, with fuel spray
bars, flameholders and ignition system.
combustor loading Expressed as a function of mass flow,
and inversely of velocity, and total inlet pressure and
temperature.
Comdac Command, display and control (USCG).
Comecon Council for Mutual Economic Assistance.
Comed Combined map and electronic display
(pronounced co-med).
Comeds Conus meteorological data system (DoD).
Comest European colour-TV satellite management
consortium.
Comfile Expandable network connecting ATC data,
voice and radar to digital recorders.
comfort chart Plot of dry-bulb T° against humidity
(sometimes modified to include effect of air motion).
Comint Communications intelligence.
comlo Compass locator.
comm Communication[s] (FAA).
command 1 Intentional control input by flight crew or
remote pilot.
2 Electrical or radio signal used to start or stop action.
3 In EDP, portion of instruction word specifying operation
to be performed.
4 Authority over precise flight trajectory exercised by
ATC or military authority (hence * altitude, * height, *
heading, * speed etc.).
command airspeed A target airspeed displayed as a
command parameter.
command augmentation system Compares pilot demand
with aircraft response, FCS receiving the difference; latest
CAS have full authority and often high gain.
command bars Principal reference index on flight
director instruments, giving attitude in pitch and roll.
command destruct System which, at range safety
officer’s discretion, can explode malfunctioning missile,
RPV or other unmanned vehicle, or trigger BUS, thereby
averting hazard to life or property.
command dot Command marker in form of bold dot or
small disc.
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