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circular milliradian
circular milliradian Conical beam or spread of fire
having angle (not semi-angle) of one milliradian.
circular nose Control surface whose leading-edge
section is semicircle about hinge axis.
circular velocity At given orbital height, velocity
resulting in circular orbit, V c = √Rg where R is radius from
Earth centre.
circulation 1 Rotary motion of fluid about body or
point; vortex.
2 Ideal flow around (not past) circular body, with
streamlines concentric circles and velocity inversely
proportional to radius (body needed to avoid infinite V at
centre).
3 Streamline flow around body of any form, defined as
integral of component of velocity along closed circuit with
respect to distance travelled around it. Wing lift created
by * superimposed on rectilinear flow past surface (see
bound vortex, Magnus, Zhukovsky).
4 Gross motions of planetary (eg Earth) atmosphere.
circulation controlled Wing, rotor blade or other aerofoil
in which external power is used to enhance lift,
typically by high-velocity tangential blowing of various
kinds.
circulator Non-reciprocal device in microwave circuit to
produce phase-shift as function of direction of wave flow
(see duplexer).
circulatory flow Rectilinear flow past lifting body
inducing circulation (3) (see Zhukovsky).
circumaural Fitting around the ear.
Circus Small formation of bombers with much larger
fighter escort, objective being to lure enemy fighters to
combat (RAF, WW2).
circus 1 Large loose formation of fighters, usually with
distinctive individual markings, flown by aces (G, WW1).
2 Loosely, group of itinerant aircraft entertaining
public and offering rides (1919–39).
CIRF Consolidated intermediate repair facility.
CIRM Comité International de Radio Maritime.
CIRO Centre Interarmée de Recherches Opérationelles
(F).
Cirpas Centre for interdisciplinary remotely-piloted
aircraft studies (USN).
Cirris Cryogenic infrared radiance instrument for
Shuttle.
cirrocumulus Cc, layer of globular cloud masses at about
6,000 m/20,000 ft. Also known as mackerel sky.
cirrostratus Cs, high milky-white or grey sheet cloud,
7,000 m/23,000 ft.
cirrus Ci, high white cloud; detached, fibrous, silky,
7,500–12,000 m/25,000–40,000 ft.
Cirstel Combined IR suppression and tail-rotor elimination.
CIRTEVS, CIRTVS Compact IR TV system.
CIS 1 Combat identification system.
2 Computer interface system.
3 Communications, or command, or combat, or
corporate, information systems.
4 Co-operative independent surveillance.
5 Cluster ion spectrometer.
6 Chemical ignition system.
7 Control indicator set, or suite.
8 Commonwealth of Independent States, of former
USSR; CST adds Collective Security Treaty.
9 Cargo-inspection system, usually PFNA or X-ray.
Civil Reserve Air Fleet
10 Cycles in service (FAA).
11 Common Industry Standards (ADIAE).
cislunar Between Moon’s orbit and Earth.
CISPR Comité International Spécial des Peturbations
Radiophoniques [radio interference].
CISS Configurable integrated surveillance system.
CIT 1 Compressor inlet temperature (flight envelope
limit).
2 Central integrated testing.
3 Cranfield Institute of Technology.
4 Control in turbulence [mode].
5 Critical-item test.
6 The Chartered Institute of Transport [1919–, received
charter 1926; office, London W1N 4DP] (UK).
7 Near or over a city.
8 Combined interrogater and transponder.
9 Commission for Integrated Transport (UK think
tank).
CITA 1 Commission Internationale de Tourisme
Aérien.
2 Confederación Interamericana de Transportadores
Aéreos.
CITE 1 Computer integrated test equipment (USAF).
2 Compression-ignition and turbine engine (fuel).
CITEJA, Citeja Comité International Technique
d’Experts Juridiques Aériens (1925–47, now part of
ICAO).
Citeps Central integrated test experimental parameter
subsystem.
CITES Convention on International Trade in
Endangered Species.
CITIS Contractor integrated technical information
system.
CITS 1 Central integrated test system, or subsystem (eg
Shuttle).
2 CAS (3) integrated targeting system.
3 Combat information transport system.
city pair Pair of cities studied from viewpoint of mutual
passenger/cargo traffic.
city pair ranking Lists of ** in order of current or
projected traffic generation.
CIU 1 Computer, central, cockpit, coupler, communications,
or control interface unit.
2 Central Interpretation Unit (RAF, 1941–).
3 Control-information unit (cartridge dispensing).
CIV 1 Crossbleed isolation, or centre interconnect,
valve.
2 Coannular inverted-velocity (nozzle).
3 Civil.
CIVA Commission International de Vol Aérobatique.
Civil Aeronautics Administration Since 1958 FAA (1).
Civil Aeronautics Board, CAB US Government (DoC)
agency responsible for civil aviation, including CARs,
licensing, routes and US mail rates.
civil aircraft Not in government [including military]
service.
Civil Air Patrol, CAP US para-military organization
using pilot and lightplane resources of general aviation for
national ends.
civil day Day of constant 24 hours (sometimes counted
as two periods of 12 hours); mean solar day.
Civil Reserve Air Fleet US airline transport aircraft and
flight crews predesignated as available at any time for
reasons of national emergency.
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