cloud ceilingnoun the height above the ground or water of the base of the lowest layer of cloud cloud groupnoun a collection of different cloud types which have similarities, e.g. stratus clouds cm abbreviation centimetre co-prefix together □ co-axial having the same axis □ co-located having the same location coalesceverb to join together to form a large mass or number o The moisture in the air coalesces into large water droplets.
coastnoun an area where the land meets the sea Valentia is situated on the coast of south west Ireland. coastaladjective refer ring to the coast □ coastal area an area near a coast o Land and sea breezes occur in coastal areas.
coatnoun a thin covering of a substance such as paint o The coats of paint on a large aircraft significantly increase its weight. verb to cover with a thin layer of a substance such as paint o Metals are coated for protection against corrosion.
cockpitnoun the forward area in an aircraft from where the aircraft is controlled by the pilot o In the case of an in-flight oil loss, a warning indicator will light in the cockpit. ‘.. .in the cockpit of the future there will be two animals, a pilot and a dog. The pilot will be there to feed the dog, and the dog will be there to bite the pilot if he tries to touch anything’ [NYT News Service]
codenoun 1. a system of numbers, letters or symbols used to represent language which has to be learned and decoded in order for the receiver to understand the meaning 2. a series of pulses by which an aircraft transponder replies to a signal from the ground codesharenoun □ code-share deal an agreement between airlines regarding connecting flights o The two airlines have entered into a code-share deal for flights between Dubai and Bangkok.
codeshare partnernoun an airline which has an agreement with another airline regarding connecting flights codesharingnoun 1.a procedure which allows travellers to use connecting flights between one airline and another partner airline for worldwide destinations 2. an arrangement by which two airlines sell seats on the same flight using their own flight numbers
collapsenoun a sudden and complete fall □ the collapse of a company the end of the existence of the company ■ verb 1. to fall suddenly and completely o The magnetic field will reach a maximum in one direction, collapse to zero and reach a maximum in the opposite direction. 2. to fold or to close suddenly and unintentionally □ the undercarriage collapsed (of an apparatus) the undercarriage could not support the aircraft and broke or retracted on its own 3. to faint □ the passenger collapsed the passenger fell and became semi- or fully unconscious because of some medical problem ‘… as the aeroplane slid off the runway, the left landing gear collapsed’ [Pilot]
collectverb 1. to gather over a period of time o Any given object will usually collect ice more quickly at high speed. 2. to take something or to pick something up from a place collectionnoun 1. a number of things brought together o a collection of vintage aircraft 2. an act of being collected by somebody o The documents are in the office awaiting collection.
collisionnoun a crash between two objects, two vehicles, etc. If there is a risk of collision, alter course to the right. □ collision avoidance the prevention of collisions by taking measures beforehand to ensure that they do not happen
columnnoun 1. a body of fluid or solid with a tall, narrow shape o Torricelli first demonstrated that the atmosphere has weight by showing that it can support a column of liquid. 2. a vertical section of a table in a document o Column four of the table shows the totals of the other three columns.
commandnoun an order □ the command to evacuate the order to leave the aircraft in an emergency □ in command having responsibility for and authority over ■ verb to order something to be done o The captain commanded the evacuation of the aircraft.
commandernoun a pilot in control of, and responsible for, the aircraft and its contents during flight time □ the commander of an aircraft the member of the flight crew specified by the operator as being the commander
commercial aircraftnoun aircraft used to carry cargo or passengers for payment
commutatornoun a device containing metal bars connected to the coils of a generator to produce electrical current o As the power output required is DC not AC, a commutator is fixed at one end of the armature.
compactadjective small, close together, or not taking much space o The annular system, as used on modern aircraft, provides a compact system, and, for the same output and mass flow, a shorter system. ■ verb 1. to make smaller or more dense by pressing 2. to compress, by driving over with heavy machinery o When taxiing on grass, aircraft wheels compact the earth as the aircraft moves over it.
compactionnoun the act of pressing things together to form one, or of compressing something to make it hard o The speed of impact when the aircraft passes through a snowstorm causes compaction of snow-flakes into a solid mass on leading edges and air-intakes.
compareverb to find the similarities and dissimilarities between two or more things o When the chart is properly orientated, it is easier to compare the distance between landmarks on the ground with their corresponding distances on the chart. o An aneroid barometer is small compared with a mercury barometer. (note: Compare with is regarded by some as better usage than compare to.)
compatibleadjective referring to a component or system which can be used with a different component or system without causing any problems o Computer software designed for one particular system may not be compatible with other systems.
Compensateverb 1.to make up for the loss of something o The floor covering may be designed to compensate for temperature, pressurisation and bending loads. o The fall in air temperature increases the air density and so compensates to some extent for the loss of the thrust due to atmospheric pressure. 2. to give money to a person or organisation to make up for a physical or financial loss o The money offered by the company did not compensate for the injuries she received in the accident.