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control-line aircraft
2 Connection between control car of airship and
controlled item.
control-line aircraft Model aircraft whose trajectory is
controlled by varying tensions or signals in two or more
filaments linking it with ground operator.
control lock Physical lock preventing movement of
control surface, either built into aircraft or brought to it
and fastened in place.
control-motion noise Sufficient to cause small surface
movement in coupled ILS, but not affecting trajectory.
control panel Self-contained group of controls, indicators,
test connections and other devices serving whole or
portion of aircraft system, either accessible in flight or
only during ground maintenance.
control pattern In SSR/IFF, governs reply code for each
mode selected.
control plane CP, in a helicopter, the plane commanded
by cyclic pitch, also called the swashplate plane.
control point Fixed position, marked by geographic
feature, electronic device, buoy, aircraft or other object,
used as designated aid to navigation or traffic control
(NATO, USAF).
control reversal In aircraft flight control system,
dangerous state in which pilot demand causes response in
opposite sense. Normally caused by either mechanical
malfunction (eg crossed controls) or aeroelastic distortion
of airframe.
control rocket Usually small and intermittently fired
thruster for changing spacecraft attitude and refining
velocity.
controls As ‘the *’, primary flight control input devices,
esp. in aerodyne; typically stick and rudder pedals.
control sector Defined block of airspace within which
one controller, or group of controllers, has authority
[normally feature of civil ATC].
control stick Control column (colloq.).
control-stick steering Control of aircraft trajectory by
input to AFCS by means of primary flight controls. Not
same as * -wheel *.
control surface Aerofoil or part thereof hinged near
extremities of airframe so that, when deflected from
streamwise neutral position, imparts force tending to
change aircraft attitude and thus trajectory.
control surface angle Measured between reference
datum on control surface and chord of fixed surface or
aircraft longitudinal axis.
control system In missile, RPV or aircraft flying on
AFCS, serves to maintain attitude stability and correct
deflections (NATO, USAF). Also, not included in this
definition, translates guidance demands into changes in
trajectory.
control tower ATC organization, normally located on
tower or near airfield, providing ATC service for airfield
traffic and possibly within other airspace.
control vane Refractory surface, usually small, pivoted
in jet of rocket or other propulsion system to control attitude,
and hence trajectory, of vehicle when deflected from
neutral setting.
control warfare Information warfare.
control-wheel steering Autopilot mode giving manual
control of heading while holding velocity and/or attitude.
control zone Controlled airspace extending upwards
from Earth’s surface (NATO, USAF). SEATO has long
and involved definition including ‘and including one or
convertor
more airdromes’ (sic). ICAO adds ‘to a specified upper
limit’.
Conus Continental US, ie US and its territorial waters
between Mexico and Canada plus Alaska, but excluding
overseas states.
Conv Convergent, convergence.
convection 1 In fluid dynamics, transfer of fluid property
by virtue of gross fluid motion.
2 In atmosphere, transfer of properties by vertical
motion, normally thermally induced.
convection cooling Method of cooling hot hardware,
esp. gas turbine rotor blades, by removing heat from
within bulk of material by flow of cooler air passing
through system of holes or passages (see film cooling, transpiration
cooling).
convective cloud Cumuliform, CuF, triggered by
convection; normal vertical development fair-weather
cumulus; extreme form is cumulonimbus. Bottom lies at
condensation level; top can be in stratosphere.
Convective Sigmet Issued for convective weather posing
potential danger.
convenience bag Sick bag [despite name, not for urine,
though some are marketed for both purposes].
conventional Not nuclear, ie HE.
conventional enhancement Modifies B-52H for electrical
and software interfaces for future weapons, using
MIL-STD-1760.
conventional stores Free-fall HE devices.
conventional take-off and landing, CTOL Aeroplanes
other than STOL, VTOL and other short-field forms.
convergence 1 Condition in which, at least reckoned on
surface winds, there is net inflow of air into region.
2 Of mathematical series, one having a limit.
3 Of vector field, contraction.
4 Of terrestrial meridians, angular difference between
adjacent pair at particular position.
convergence factor Ratio of convergence (4) and change
of latitude (zero at Equator, max. at poles).
convergent Of oscillation – eg sinusoidal motion,
phugoid or structural vibration – tending to die out to
zero within finite (possibly small) number of cycles.
convergent/divergent See con-di nozzle.
converging flight rule Aircraft approaching from right
has right of way.
conversion angle That between great-circle and rhumbline
bearings.
Convertible Fighter-type aircraft missing canopy /
canopies, for whatever reason (US colloq.).
convertible aircraft 1 Transport aircraft designed for
rapid conversion from passenger to all-cargo configuration
or vice versa.
2 Aircraft which can change its configuration [eg. from
rotor to fixed wing] in flight.
convertible brake Able to make quick change anywhere
between carbon/compo/steel.
convertible engine One capable of giving either fan
thrust or shaft power.
convertible laser designation pod Any ‘convertible’ pod
usually offers a choice of LWIR or TV.
converticar One term for a roadable VTOL.
convertiplane Aerodyne capable of flight in at least two
distinct modes, eg vertical flight supported by lifting rotor
and forward translational flight supported by wing.
convertor Among many other meanings;
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