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CHB
3 [also chattering] any small uncommanded repeated
operations, e.g. by hydraulic jack.
CHB Common high band[width]; DL adds datalink.
CHC Chance, traditionally 30–40% likelihood of
precipitation.
CHD Crutching heavy-duty (stores carrier).
CHDO Certificate-holding district office (FAA).
cheatline Bold line[s], usually horizontal, painted at
artistically pleasing level along side of aircraft.
check 1 To verify flight progress (eg ETA *).
2 To examine pilot for proficiency.
3 Examination conducted in (2).
4 Programmed investigation of aircraft for malfunction
(before-flight *, after or post-flight *, etc).
5 Programmed procedural routine from entering
cockpit to start of flight (cockpit *).
6 To reduce in-flight trajectory variable (* rate of
descent).
Checkered Flag Provides designated bases and procedures
for overseas training deployments (USAF, TAC).
checker team Responsible for maintenance of all
runway/taxiway/apron markings.
check finals! Last brief vital actions before landing
(items not standardized).
check in 1 Several meanings, esp. to call up tower to
establish frequencies and procedures at start of cockpit
check.
2 For airline passenger, to report at designated * desk,
have page of flight coupon torn off, hand over hold
baggage and be assigned seat.
checking station 1 Designated and marked location used
in rigging airframe. Also called checking point.
2 Reference station on propeller blade, typically at 42
in radius on lightplanes.
checklist Written list of sequenced actions taken in
check (5), usually printed on plastics or laminated pages.
Usually also includes emergency actions, V-speeds and
short- or soft-field procedures.
check-out 1 Programmed test by user immediately
before operational use of missile, radar or other system.
2 Sequenced tasks to familiarise operator with new
hardware.
check point, checkpoint 1 See waypoint.
2 Geographical point happening to offer precise fix.
3 Planned strategic review of major industrial
programme for government customer, esp. collaborative.
4 Predetermined geographical location serving as reference
for fire adjustment or other purpose.
5 Mean point of impact.
check six! Look astern for hostile fighters.
check valve One-way valve in fluid line.
cheese aerial (antenna) Shaped roughly like D in side
elevation with quasi-circular or parabolic reflector and
flat parallel sides nodding in elevation; propagates more
than single mode.
cheesed Thwarted, disgruntled; occasionally * off (RAF
colloq., WW2).
chemical fuel Has ambiguous connotation excepting
common fuels; hence, ‘exotic’ fuel, esp. for air-breathing
engines.
chemical laser Strictly, one in which chemical reaction
occurs, eg perfluoromethane/hydrogen.
chemical milling Use of acid or alkaline bath to etch
metal workpiece in controlled manner.
chine
chemical munition Non-explosive ordnance operating
by chemical reaction: incendiary, smoke, irritant or lethal
gas, defoliant, flare or flash, dye marker etc.
chemical propulsion Propulsion by energy released by
chemical reaction, eg fuel + oxygen, with or without air
breathing.
chemical rocket Rocket operating by chemical reaction;
not ion, photon or nuclear.
chemical warfare Use of major chemical munitions, esp.
irritant or lethal gases.
chemosphere Region of upper atmosphere (say
15–120 miles, 24–190 km) noted for photochemical reactivity.
chequered flag 1 Black/white, various meanings
including race winner.
2 Red/yellow, do not move off blocks until ATC
permits.
3 See Checkered Flag.
cherl Change in Earth’s rate (tangential velocity) of
rotation with latitude.
Cherry rivet Tubular rivet inserted blind and closed by
internal mandrel (shank) which then breaks and is
removed.
chest-type parachute Pack stored in aircraft separate
from harness, to which it is secured by quick clips on chest.
cheval du bois ‘Wooden horse’ = swing [1] (F).
cheval vapeur Metric horsepower, 1 cv = 0.98632 hp =
0.7355 kW; reciprocals 1.01387, 1.35962.
chevron mixer Sawtooth nozzle.
Cheyenne Mountain Location of USAF/Norad Space
Command HQ.
CHF 1 Commando helicopter force.
2 Swiss franc[s].
CHG 1 Change, ie modifying previous message;
CHGD, changed.
2 Charge.
CHI Computer/human interface.
Chicken See State chicken.
chicken bolts Temporary fasteners used in metal
airframe assembly.
chicks 1 Fighters, especially airborne group under
unified local command (USN).
2 Fighters in group round air-refuelling tanker.
chiefy Flight sergeant in charge of erks (RAF, colloq.).
Chili Dry southerly wind (N. Africa).
chilldown Pre-cooling of tanks and system hardware
before loading cryogenic propellant.
chilled Stage at which design is almost frozen [change
accepted reluctantly].
chilled casting Made in mould of metal, usually ferrous,
giving rapid cooling and thus surface hardness.
chime Melodious warning of imminent announcement
to passengers, typical output 120 W.
Chimp Common-good high-grade Infosec module
[programmable].chin Region under aircraft nose; hence
* blister, * intake, * radome, * turret.
china-clay Technique for distinguishing regions of
laminar and turbulent boundary layer from changed
appearance of thin coating of * suspension.
China Lake California desert home of NAWS.
chine In traditional marine aircraft hull or float, extreme
side member running approximately parallel to keel in
side elevation. In supersonic aircraft, sharp edge forming
lateral extremity of fuselage, shedding strong vortex and
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