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cup
2 Cockpit upgrade program[me].
cup Non-SI unit of volume, = 2.3659 10 –4 m 3 .
Cupid Common, or combat, upgrade plan integration,
or integrated, details (USAF).
cupola 1 Turret-like structure projecting from aircraft
with windows giving maximum field of view.
2 Manned viewing station on space station for observation
of docking, truss construction and placement of
antennas and other equipment.
cupping Re-rigging to increase angle of incidence.
curie, Ci Unit of radioactivity equal to 3.7 x 10 10 disintegrations
or transformations per second, replaced by
becquerel.
curie point Critical temperature, different for each
material, above which ferromagnetic materials lose
permanent or spontaneous magnetisation.
curing Process by which most synthetic rubbers, plastics
and solid-propellant binders are converted to compositions
of higher molecular weight; may involve heating
(condensation polymerization), chain reaction via freeradical
or ionic mechanism (addition polymerisation), or
use of catalysts. In solid rocket motors semi-liquid is often
cured in case, solidifying and becoming case-bonded.
curl Vector resulting from action of operator del (differential
operator in vector analysis) on vector; sometimes
called rotation.
curling die Used with curling punch to bend sheet edges
to tubular form.
curlover Possibly dangerous downdraft and turbulence
downwind of trees or buildings.
currency Continuing validity of licence, esp. that for
pilot.
current 1 Pilot is qualified on particular type and
routinely flying it.
2 Civil aircraft is on active register and in routine
operation.
3 Flight plan is that being followed.
cursive writing Rounded, flowing writing with strokes
joined; hence formed in display by actual strokes rather
than TV-type raster scanning.
curtain 1 Non-gastight partition in aerostat.
2 Electronic barrier formed by wall of chaff.
curved approach 1 Adopted by some aircraft, notably
WW2 fighters, because of inadequate forward view
straight ahead at low airspeeds.
2 Any of numerous possible quasi-elliptical paths
followed when using MLS or other system offering such
approach paths on either side of straight centreline.
curved trend Turn information imparted by three future
track-lines on EHSI terminating 30 sec, 60 sec and 90 sec
hence; these are straight with wings level but in banked
turn show *, in extreme case linking in 360° circle (does
not allow for drift).
curve of pursuit Followed by any aircraft chasing
another and continuously steering towards latter’s
present position; with non-manoeuvring target curve
soon becomes asymptotic with target straight-line course.
curvic coupling Joint between driving and driven shaft
systems which transmits torque perfectly; allows for small
errors in alignment or angle but does not secure one to
other [in fact, making faces tend to push apart]. In
simplest form comprises two sets of meshing radial teeth
of smooth curving profile.
CV
curvilinear flight Accelerated flight, ie not straight and
level.
Cus, CUS Customs available.
cushion See ground cushion.
cushion creep Use of ground cushion for gradual helicopter
takeoff.
CUSRPG Canada/US Regional Planning Group.
Cuss, CUSS Common-use self-service, for check-in
desks which automatically identify and process passenger.
CUSS is an electronic standard [v1.0], produced by SITA
but specified by IATA. K adds kiosk.
customer Usually purchaser and operator are synonymous;
where purchaser is government agency and
operator an air force, or purchase is finance company or
bank, * normally applies chiefly to operator.
customer base Total list of customers (term usually
refers to civil air carriers) committed to purchasing or
leasing new type.
customer bleeds See customer supplies.
customer mock-up Exact reproduction of aircraft interior,
or part thereof, furnished with materials, fabrics,
colours, seats and other equipment as specified by
customer.
customer supplies Bleed-air or shaft power, other than
that required for propulsion, needed for aircraft services.
customised lead time No spares supplied until needed, *
typically 2h–2 years.
customising 1 Finishing GA aircraft to customer’s spec.,
eg furnishing, avionics kit, external paint.
2 Finishing avionics or instruments for particular task
with chosen language, labels, IC chips and self-test.
cusum Cumulative sum [suggest: tautology].
cut Sudden complete shutdown of power [noun and
verb]; hence: the *, command given by batsman on carrier.
C/UT Code/unit test.
cutaway General term for detailed perspective drawing
showing maximum detail of 3-D object.
cutback 1 Sudden partial closure of throttles at end of
first climb segment for noise-abatement reasons.
2 Reduction in existing or planned procurement.
3 Reduction in manufacturing rate.
cut-back nozzle Normally, one (not of con-di type)
shortened in length and terminating obliquely to give
thrust slightly inclined to pipe axis.
cutback speed ASIR at top of first segment.
Cute Common-user terminal equipment (SITA).
Cutlass Combat UAV target locate and strike system.
cutlet Cutlet-shaped flattened outer arm of hub forging
of rigid rotor.
cutoff 1 Termination of rocket propulsion before
burnout because desired trajectory and velocity have been
reached.
2 Flying shortest track to intercept an air target.
cutoff ports Circular apertures in forward face of solid
motor which can swiftly be blown open to terminate
combustion.
cut-out 1 Aperture in pressurized fuselage, for door,
window, hatch or other purpose.
2 Absence of rear inner part of elevator, terminating in
diagonal edge, to allow full rudder to be applied.
cut-out switch One isolating or inactivating circuit or
subsystem.
CV 1 Fleet [aircraft] carrier.
2 Carrier vehicle (SDI).
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