1Dk4eXg

chined tyre
merging into wing. On a landing-wheel tyre, a sharp-edge
lip for shedding water.
chined tyre Tyre, esp. for nosewheels, with chines to
depress trajectory of water or slush.
chin fairing On centreline on underside of leading edge
[T-tail].
chin fin Fixed destabilizing fin under nose.
Chinook Warm dry westerly wind on E side of Rocky
Mountains. In Europe, called Föhn.
chin turret A gun or sensor turret mounted under the
nose of a pre-1950 bomber or an attack helicopter.
chip 1 Single completed device separated from slice,
wafer or other substrate of single-crystal semiconductor.
2 Metal fragment, visible to eye, broken from engine or
other machinery.
chip chart Rectangles of paint showing colours available.
chip detector Device, often permanent magnet, for
gathering every chip (2), usually from lube oil.
Chips Cosmic hot interstellar plasma spectrometer.
chips Killed; from to have had one’s * (RAF colloq,
WW2).
chip width Length of PN code bit, T c .
Chirp Confidential human-factors incident reporting
procedure (or programme) (CAA).
chirp 1 Radar/communications pulse compression or
expansion (colloq.).
2 Particularly, pulse compression by linear FM.
CHIS Center hydraulic isolation system.
chisel window Small oblique nose window for LRMTS
or camera.
CHL Chain Home Low.
ch.lat. Change of latitude (pronounced sh-lat).
ChLCD Cholesteric liquid-crystal display.
ch.long. Change of longitude (pronounced sh-long).
chlorine Cl, toxic green/yellow gas, density 3.2, MPt -
101°C, present in vast range of aerospace products.
Chobert Tubular rivet inserted blind and closed by withdrawal
of re-usable mandrel.
Choc Combined hydrocarbon filter and catalytic ozone
converter.
chock Portable obstruction placed in front of and/or
behind landplane wheel(s) to prevent taxiing.
chocks away Traditional signal to ground crew to
remove chocks [usually one arn waved over head side to
side].
chock-to-chock See block time.
choke 1 Inductance used to offer high reactance at
chosen frequency to pass d.c. or lower a.c. frequencies
only.
2 In typical car (auto) engine, manual control for
reducing inlet airflow to enrich mixture when cold, rare in
aviation.
choked flow Flow of compressible fluid in duct [eg
tunnel or jet-engine nozzle] in which local Mach number
has reached 1 and velocity cannot be increased significantly
by increasing upstream pressure.
choked inlet Containing normal shock and suffering
choked flow.
Chol, CHOL Common [or Collins] high-order
language.
cholesteric LCD with layers each aligned in preferred,
different direction.
chromate primer
chomp Changeover (from one waypoint VOR, NDB etc
to next) at midpoint (of leg).
Chop Countermeasures hands-on program[me].
chop 1 Changeover point.
2 Change of operational control, precisely promulgated
time.
3 To get the *, sudden termination (of human life,
project, place on flying-training course, etc. colloq.).
4 To close throttle(s) completely and suddenly.
5 Atmospheric turbulence, esp. CAT, categorised as
mild (also called light), moderate (or medium) and severe
(or heavy).
chopped fibre Reinforcing fibre chopped into short
lengths.
chopped random mat Chopped fibre made into mat
(two-dimensional sheet) with random orientation.
chopper 1 Rotary-wing aircraft, esp. helicopter
(colloq.).
2 Mechanical device for periodically interrupting flow,
esp. light beam, or switching it alternately between two
sources.
3 Device for modulating signal by making and breaking
contacts at frequency higher than frequencies in signal.
chop rate Rate of aircraft or crew loss on operations, or
wastage rate in flying training (colloq.).
chord 1 Straight line parallel to longitudinal axis joining
centres of curvature of leading and trailing edges of aerofoil
section.
2 Some authorities prefer the line joining the trailing
edge to the stagnation point on the leading edge.
3 Loosely, breadth of wing or other aerofoil from front
to rear.
4 Boundary members of structural truss.
5 In the new century this is the preferred spelling of
what was previously called miniature detonating cord.
chord direction In stress analysis, usually parallel to
chord at aircraft centreline (of wing, or wing produced to
centreline).
chord length Length of chord (1), not measured round
profile.
chord length ratio At any radius, the total chord length
of all the blades of a propeller divided by the diameter.
chord line See chord (1). Ambiguously, sometimes line
tangent at two points to lower surface (see geometric
chord).
chord plane Plane containing chord lines of all sections
forming three-dimensional aerofoil (assuming no twist).
chord position Defined by location of quarter-chord
point and inclination to aircraft x-y plane, point being
defined on primary centreline co-ordinates.
chord wire Wire tying vertices of airship frame.
chordwise Parallel to chord (normally also to longitudinal
axis).
chosen instrument Carrier selected as national
monopoly [can be private company].
CHP Controlled-humidity preservation.
CHR Cooper-Harper rating.
CHRG Charges.
Christmas tree Aircraft temporarily set aside as source
of spare parts, but to be eventually returned to service.
chromate enriched pellet Small source of antifungal
chemical in integral-tank low point (possible water trap).
chromate primer Anti-corrosive, antimicrobiological
surface treatment, esp. for water traps in airframe.
141