captive balloon noun a balloon which, when in flight, is attached to the ground by a long cable carbonnoun 1. a non- metallic element, which is a component of living matter and organic chemical compounds and is found in various forms, e.g. as diamonds or charcoal 2. a black material with good electrical properties
carbon dioxide noun a colourless, odourless, non-toxic gas found in the atmosphere, and also used in fire extinguishers and fizzy drinks o Carbon dioxide can be solidified at low temperature to produce dry ice. Symbol CO2 carbon fibrenoun a thin, light and very strong strand of pure carbon which can be combined with other materials to make them stronger
carburettor icing noun a process by which, under particular conditions, ice forms in the venturi tube of the carburettor cardioid‘ adjective shaped like a heart o The cardioid polar diagram of the magnetic field around a bar-magnet.
carrier wavenoun a radio signal that is transmitted continuously at a constant amplitude and frequency o Amplitude modulation has only one pair of usable sidebands each at about one sixth of the signal strength of the carrier.
cartridgenoun a removable unit for an air filter o Cabin air filters normally consist of a casing, housing a replaceable filter cartridge. CAS abbreviation 1. calibrated airspeed 2. controlled airspace casenoun 1. an outer covering, housing or jacket o Cooling air is directed through passages in the engine case to control engine case temperature. 2. an example, situation or circumstance o In some special cases, e.g. for landing and take-off, wind directions are measuredfrom magnetic north.
catastrophenoun a very bad event or accident, a disaster o the recent air catastrophe off the Nova Scotia coast.Although the family were not at home when it happened, the crash which destroyed their house was a catastrophe for them.
catastrophicadjective terrible, disastrous o In a catastrophic accident where many persons may be disabled, those who show signs of life should be rescued first. categorisecategorize verb to put into groups, classes or categories o Figure 2 categorises the types of wave by frequency band.Aircraft can be categorised by weight, number of engines, role, etc. categorynoun an official class or group o Load factors vary depending on the category of aircraft. cathodenoun a negative electrode or terminal o The cathode is a metal cylinder fitted with an internal heater.
cathode ray tube noun a high-vacuum tube in which cathode rays produce an image on a screen such as a TV screen o Electronic indicating systems show engine indications, systems monitoring and crew alerting functions on one or more cathode ray tubes or liquid crystal displays mounted in the instrument panel. Abbreviation CRT causenoun something that makes something else happen, a reason o If the ammeter shows a high state of charge after start up, it is quite normal and no cause for alarm. verb to make something happen o Air in the fuel line can cause an engine to flame-out or stop.
Cavitationnoun the formation of vapour-filled cavities or holes in liquids and gases, caused by low pressure or high speed o Most reservoirs are pressurised to provide a positive fluid pressure at the pump inlet and thus prevent cavitation and the formation of bubbles.
Cavitynoun a hole Deicing fluid flows into the cavity in the distributor panels before passing through the porous steel outer skin. CB abbreviation cumulonimbus ccabbreviation cubic centimetres cd symbol candela
navigation by using the stars in the sky cellnoun 1. a system of positive and negative plates for storage of electricity that form a battery o A battery is a device which converts chemical energy into electrical energy and is made up of a number of cells. 2. the central part of a thunder cloud o The life cycle of the thunderstorm cell ends when the downdraughts have spread throughout the cloud.
centigradenoun a scale for measuring temperature in which water freezes at 0° and boils at 100°. Symbol C. Compare Fahrenheit centimetrenoun a measure of length that is equal to one hundredth of a metre (note: 2.54 cm = 1 inch.)
noun a central agency in Brussels that is responsible for air traffic management throughout the area controlled by the ECAC
The plane of the great circle passes through the centre of a sphere. □ centre of a circle mid-point of a circle, point in the middle of a circle 2. a main building or office o Area Forecasting Centre ■ verb to move to a central position o Centre the control column. (note: centred – centring; the US English is centered – centering.)
Comment: If the centre of gravity is outside the limits, the aircraft may be difficult or impossible to control.
centrifugenoun a device which uses centrifugal force to separate or remove liquids ■ verb to separate liquids by using centrifugal force o The rotating vanes of the breather centrifuge the oil from the mist.
centripetal force noun inward, centre-seeking force working in opposition to centrifugal force o The magnitude of the centripetal force varies with the square of the wind speed. o In a turn, lift provides the centripetal force.
certain‘ adjective 1. particular, some o in certain areas o at certain times o under certain circumstances 2. sure There are certain to be horizontal differences in the mean temperature of a layer. □ to make certain to make sure o Make certain that the parking brake is on before doing engine run-up checks.
certificate nounan official document which states that particular facts are true verb to award or give a certificate □ aircraft which are certificated for flight aircraft which have the necessary paperwork to be authorised to fly certificate of airworthiness noun a document issued by an aviation authority stating that an aircraft meets specific safety and performance requirements that allow it to be used in service o An authorised person may require production of the Certificate of Airworthiness.
CFRP abbreviation carbon fibre reinforced plastic
Chalknoun a soft white lime stone rock that may be used in powder form or as a shaped stick for writing with Oil, which is trapped in the defects, is absorbed by the chalk thus indicating their positions. chambernoun a small enclosed compartment chandellenoun a steep climbing turn in which an aircraft almost stalls as it uses momentum to increase its rate of climb channelnoun a special frequency band for the transmission of radio signals o The system operates on VHF communications between 118 and 135.95 MHz giving 360 channels at 50 kHz spacing.