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CIGFTPR
CIGFTPR Controls-instruments-gas-flaps-trim-proprun-up
(US).
CIGS Chief of the Imperial General Staff [now CGS]
(UK).
CIGSS Common imagery ground/surface standards.
CIGTF Central Inertial Guidance Test Facility
(USAF).
CIIP Critical information infrastructure protection.
CIJ Close-in jamming.
CIL 1 Candidate-items list.
2 Command Information Library (NIMA).
CIM Computer-integrated manufacturing.
CIMA 1 Chartered Institute of Management
Accountants (UK).
2 Commission Internationale de Micro Aviation (FAI).
Cimact, CIMACT Civil/military air-traffic management
co-ordination tool (Eurocontrol).
CIME Commission Intergouvernementale des
Migrations Européennes (Int., arranges mass flights, eg
for refugees).
CIMT Configuration integration management team.
Cimtic C 4 I and munitions test improvement contract.
CIMTIG Charetered Institute of Marketing Travel
Industry Group (office Westerham, UK).
CINA Commission Internationale de la Navigation
Aérienne (Int., office Paris, 1922–).
Cincat Capacity increase through controller assistance
tools (Euret).
Cinch Compact inertial navigation combining HUD.
CINS Compact INS.
CIO 1 Central Imagery Office (US).
2 See AFL-CIO.
3 Chairman in office.
4 Chief information officer.
CIOD Counterspace and Information Operations
Division (USAF).
CIOS Combined Intelligence Objectives Subcommittee
(US/UK, WW2).
CIP 1 Cold iso-pressing (beryllium).
2 Component [or communications] improvement
program(me).
3 Commission Internationale de Parachutisme (FAI).
4 Commercially important passenger.
5 Command input potentiometer.
6 Capital investment plan (FAA).
7 Critical infrastructure protection.
8 Common integrated processor.
9 Common imagery, or core-integrated, processor [see
next].
CIPM Common integrated processor manager.
CIPR 1 Cubic inches per revolution.
2 Continuous in-flight performance recorder.
CIR 1 Constant, or continuous, infra-red (heat source
on target).
2 Cockpit image recorder.
CIRA 1 Cospar International Reference Atmosphere.
2 Centro Italiane Ricerche Aerospaziali (I).
CIRC Central information reference and control.
Circ, circ Circling or circulating.
circadian rhythm Change in physiological activity on
approximate 24 hour cycle.
Circe Cossor interrogation and reply cryptographic
equipment, enabling all participating nations to have own
secure cryptographic IFF.
circular milfoot
Circle Circuit (US); can also be an instruction to join
stack.
circle marker On unpaved airfield, white circle indicating
centre of landing area.
circle of confusion Image of any distant point on lens
focal plane (eg on film).
circle of equal probabilities, CEP Radius of circle within
which half the strikes (eg bullet impacts on single aiming
point) fall or within which probability is equal that one
bullet, bomb or RV will fall inside or outside. Also called
circular error probable.
circle of latitude On celestial sphere through ecliptic
poles, perpendicular to ecliptic.
circle of longitude On celestial sphere parallel to ecliptic.
circle of origin Normally, Equator or Prime Meridian.
circle of position Circle on Earth’s surface centred on
line joining centre of Earth to heavenly body, from which
altitude of body is everywhere equal. Sometimes called
circle of equal altitude.
circuit 1 Basic element in pilot training, short flight
comprising takeoff and precisely executed * back to
landing, if necessary ready for repeated *. In US often
circular, but in UK and most other countries rectilinear,
comprising takeoff, straight climbout [upwind leg] to
[typically] 300 m/1,000 ft, turn 90° [in either direction, but
usually L] on to crosswind leg, second 90° turn on to
downwind leg, passing airfield parallel to active runway,
third 90° turn with power off on to descending second
crosswind leg [often called base leg] followed by 90° turn
on to finals. Depending on circumstances, * may be
followed by immediate takeoff called touch-and-go [if the
aircraft is brought to rest, called stop-and-go] for second
* or by taxi back to downwind end of runway for next
takeoff; * can be L-hand or R-hand. US term pattern,
circle or traffic circle.
2 List of airshows [usually annual] at which particular
aircraft regularly appear.
3 Closed loop of electrical conductors.
circuit analog absorber Large family of RAM (2) in
which outer resistive sheet is given an imaginary part to
its admittance, by laying it down in form of many discrete
elements such as dipoles, crosses and meshes. See
frequency-selective.
circuit breaker Switch for opening circuit (3) while
carrying large electrical load.
circuit length Length round closed-circuit wind tunnel
traversed by streamline always equidistant from walls.
circuits and bumps Repeated circuits (1) with landing [or
at least a touch-and-go] at end of each (colloq.).
circular approach Precision training manoeuvre, chiefly
associated with carrier flying, where circuit (1) is circular.
circular dispersion Diameter of smallest circle within
which 75 per cent of projectiles strike.
circular error probable See bombing errors (1).
circular isotropic Aerial (antenna) radiation polar equal
in all directions (normally in azimuth).
circularisation Refinement of satellite orbit to approach
perfect circle, usually at given required height.
circular mil Area of circle of one mil (1/1,000 inch) diameter
= 5.067 10 -10 m 2 (7.85 10 -7 in 2 ).
circular mil foot Unit of resistivity; resistance of one foot
of wire of one circular mil section, equal to ohm-mm
6.015 10 5 .
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