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CLD
CLD 1 Cloud (ICAO).
2 Crutching light-duty (stores carrier).
cld Cloud.
CLDP Convertible laser-designation pod.
CLDS 1 Cockpit laser-designation system.
2 Clouds.
CLE Central Landing Establishment, RAF Ringway
1941, pioneer paratroop/glider school.
Clean Component validator for environmentally
friendly aero engine (Europe).
clean 1 Of aircraft design: streamlined, devoid of struts
and other excresences.
2 Of aircraft condition: landing gear, high-lift systems
and other extendible items retracted, and not carrying
drop tanks, external ordnance or other drag-producing
bodies.
3 Nuclear weapon designed for reduced, or minimal,
residual radioactivity compared with normal weapon of
same yield.
cleaning In prolonged glide with piston-engined
aircraft, to open up engine briefly to high power to clear
over-rich mixture and gummy or carbon deposits.
clean room Sealed airlock-entrance facility for manufacture
[eg, of inertial gyro] or examination of space
samples, with rigid rules on humans admitted.
clean up To retract gear and flaps, and other high-lift
devices, after takeoff.
clear 1 To authorise hardware as fit for use.
2 To authorise person to receive classified information.
3 To rectify stoppage in automatic weapon.
4 To unload weapon and demonstrate no ammunition
remains.
5 To empty core store, register or other memory
device.
6 In flight operations, authorised to take off, land or
make other manoeuvre under ground control.
7 En route, to pass over waypoint.
8 To destroy all hostile aircraft in given airspace.
9 Of local sky, devoid of clouds (“the *”), but may be
above or between cloud layers.
10 To clean piston engine; see cleaning.
11 To fly out of a local area, eg a flying display.
12 Not secure [communications].
clear air turbulence, CAT Significant turbulence in sky
where no clouds present, normally at high altitude in high
windshear near jetstream.
clearance 1 Authorisation by ATC (1), for purpose of
preventing collision between known aircraft, for aircraft
to proceed under specified conditions within controlled
airspace (see abbreviated *, SIDS, STARs, * delivery, *
items, * limits).
2 Minimum gap between portions of hardware in
relative motion (eg fan blade and case).
3 Transport of troops and material from beach, port or
airfield using available communications.
4 Approval for publication of written text, image or
film concerning sensitive subject, after excision of
offending parts.
clearance amendment Change in clearance (1) made by
controller to avoid foreseeable conflict.
clearance control Precise control of the microscopic gap
between the tip, or outer radius, of a rotating structure
and the surrounding fixed casing. Also called tip*.
climb indicator
clearance delivery ATC service, with assigned
frequency, for issuing pre-taxi, taxi and certain other preflight
clearances.
clearance function Clearance delivery (UK).
clearance limit Fix or waypoint to which outbound
flight may be cleared, there to receive clearance to
destination.
clearance void Automatic cancellation if takeoff not
made by specified time.
clearance volume Minimum volume remaining in piston
engine cylinder at TDC.
cleared flight level FL to which flight is cleared, though
possibly not yet reached.
cleared through Valid to clearance limit, including intermediate
stops.
clear ice Glossy, clear or translucent accretion from
slow freezing of large supercooled water droplets.
clearing manoeuvre Change of aircraft attitude, on
ground or in flight, to give better view of other traffic.
clearing procedure Clearing manoeuvre, often combined
with vocal callouts (esp. when pupil under instruction)
before takeoff or any other flight operation (eg scrutiny
of airspace beneath prior to spin).
clearing turn Turn in which pilot checks local airspace,
especially below, before stall or spin.
clear-vision panel See DV panel.
clearway 1 Rectangular area at upwind end of runway
or other takeoff path devoid of obstructions and prepared
as suitable for initial climbout.
2 Specif., area beyond runway, extending not less than
250 ft/76 m wide on each side of centreline, no part of
which (other than threshold lights away from centreline
and not over 26 in/660 mm high) projects above * plane.
clearway plane Plane extending from upwind end of
runway at slope positive and not exceeding 1.25 per cent.
cleat 1 In airframes, a triangular brace at a junction.
2 In an aircraft equipped for towing [large military]
gliders, the attachment [usually with two pivoted jaws] for
the towrope.
clevis joint Fork and tongue joint (eg between solid
motor cases) secured by large-diameter pin.
CLF Carbon-loaded foam, common single-layer RAM.
CLFA Centre de Laser Franco-Allemagne.
CLG 1 Ceiling (ICAO).
2 Calling.
CLγ, CL gamma Circulation lift coefficient.
CLGE Cannon-launched guidance electronics.
CLGP Cannon-launched guided projectile.
CLI Common languages interactions.
Climate Change Levy Financial penalty imposed [in
absence of precise numerical values] on users of energy
from non-renewable sources (EC).
climatic test Static test in simulated adverse environments
(rain, ice, temperature extremes, salt, sand, dust) to
demonstrate compliance with requirements.
climb 1 Any gain in height by aircraft (verb or noun).
2 More commonly, deliberate and prolonged gain in
height by appropriate trajectory and power setting (ie not
zoom).
climb corridor Positive controlled military airspace of
published dimensions extending from airfield.
climb gradient Vertical height gained expressed as
percentage of horizontal distance travelled.
climb indicator See VSI.
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