Devenition And Abreviation Aeronautical Telecommunication (Alphabet C)

Cabin Altitude means the pressure inside the cabin of an aircraft in flight ,expressed in feet above Mean Sea Level (MSL). 

Cabin crew member. A crew member who performs, in the interest of safety of passengers, duties assigned by the operator or the pilot-in-command of the aircraft, but who shall not act as a flight crew member. 

Calibrated airspeed means the indicated airspeed of an aircraft, corrected for position and instrument error. Calibrated airspeed is equal to true airspeed in standard atmosphere at sea level. 

Candela (cd). The luminous intensity, in the perpendicular direction, of a surface of 1/600 000 square metre of black body at the temperature of freezing platinum under a pressure of 101 325 newtons per square metre. 

Canard means the forward wing of a canard configuration and may be a fixed, movable, or variable geometry surface, with or without control surfaces. 

Canard configuration means a configuration in which the span of the forward wing is substantially less than that of the main wing. 

Canopy. Bare Earth supplemented by vegetation height. 

Capacitor discharge light. A lamp in which high-intensity flashes of extremely short duration are produced by the discharge of electricity at high voltage through a gas enclosed in a tube. 

Captain. A pilot qualified on an aircraft and responsible for the safe operation of that aircraft. 

Cargo aircraft. Any aircraft, other than a passenger aircraft, which is carrying goods or property. 

Carrier-to-multipath ratio (C/M). The ratio of the carrier power received directly, i.e. without reflection, to the multipath power, i.e. carrier power received via reflection. 

Carrier-to-noise density ratio (C/No). The ratio of the total carrier power to the average noise power in a 1 Hz bandwidth, usually expressed in dBHz.
 

Category:
(1) As used with respect to the certification, ratings, privileges, and limitations of airmen, means a broad classification of aircraft. Examples include: airplane; rotorcraft; glider; and lighter-than-air; and (2) As used with respect to the certification of aircraft, means a grouping of aircraft based upon intended use or operating limitations. Examples include: transport, normal, utility, acrobatic, limited, restricted, and provisional. 

Category A, with respect to transport category rotorcraft, means multiengine rotorcraft designed with engine and system isolation features specified in Part 29 and utilizing scheduled takeoff and landing operations under a critical engine failure concept which assures adequate designated surface area and adequate performance capability for continued safe flight in the event of engine failure. 

Category B, with respect to transport category rotorcraft, means single engine or multiengine rotorcraft which do not fully meet all Category A standards. ategory B rotorcraft have no guaranteed stay up ability in the event of engine failure and unscheduled landing is assumed.
Categories of precision approach and landing operations:
 

Category I (CAT I) operation. A precision instrument approach and landing with a decision height not lower than 60 m (200 ft) and with either a visibility not less than 800 m or a runway visual range not less than 550m. 

Category II (CAT II) operation. 

1. A precision instrument approach and landing with a decision height lower than 60 m (200 ft), but not lower than 30 m (100 ft), and a runway visual range not less than 350 m. 

2. with respect to the operation of aircraft, means a straight-in ILS approach to the runway of an airport under a Category II ILS instrument approach procedure issued by the DGCA or other appropriate authority. 

Category III operations, with respect to the operation of aircraft, means an ILS approach to, and landing on, the runway of an airport using a Category III ILS instrument approach procedure issued by the DGCA or other appropriate authority. 

Category IIIA (CAT IIIA) operation. A precision instrument approach and landing with: 

a) a decision height lower than 30 m (100 ft) or no decision height; and 

b) a runway visual range not less than 200 m (700 feet). 

Category IIIB (CAT IIIB) operation. A precision instrument approach and landing with: 

a) a decision height lower than 15 m (50 ft) or no decision height; and 

b) a runway visual range less than 200 m (700 feet) but not less than 50 m (150 feet). 

Category IIIC (CAT IIIC) operation. A precision instrument approach and landing with no decision height and no runway visual range limitations. 

Causes. Actions, omissions, events, conditions, or a combination thereof, which led to the accident or incident. 

Celsius temperature (t°C). The Celsius temperature is equal to the difference t°C = T - To between two thermodynamic temperatures T and To where To equals 273.15 kelvin. 

Ceiling. The height above the ground or water of the base of the lowest layer of cloud below 6 000 metres (20 000 feet) covering more than half the sky or means the height above the earth’s surface of the lowest layer of clouds or obscuring phenomena that is reported as “broken”, “overcast”, or “obscuration”, and not classified as “thin” or “partial”.

Certificate means a document issued by, or on behalf of DGCA which confirms a regulatory standard as described in document, has been met. A certificate does not convey any authority to act. Certify as airworthy (to). To certify that an aircraft or parts thereof comply with current airworthiness requirements after maintenance has been performed on the aircraft or parts thereof. 

Certified aerodrome/airport. An aerodrome whose operator has been granted an aerodrome certificate. 

Channel rate. The rate at which bits are transmitted over the RF channel. These bits include those bits used for framing and error correction, as well as the information bits. For burst transmission, the channel rate refers to the instantaneous burst rate over the period of the burst. 

Channel rate accuracy. This is relative accuracy of the clock to which the transmitted channel bits are synchronized. For example, at a channel rate of 1.2 kbits/s, maximum error of one part in 106 implies the maximum allowed error in the clock is ±1.2 × 10-3 Hz. 

Change-over point. The point at which an aircraft navigating on an ATS route segment defined by reference to very high frequency omnidirectional radio ranges is expected to transfer its primary navigational reference from the facility behind the aircraft to the next facility ahead of the aircraft. Charter Air Carrier means any air carrier that provides an air transportation service on a non-scheduled basis. 

Civil aircraft means aircraft other than public aircraft. 

Circuit mode. A configuration of the communications network which gives the appearance to the application of a dedicated transmission path.
Class:
(1) As used with respect to the certification, ratings, privileges, and limitations of airmen, means a classification of aircraft within a category having similar operating characteristics. Examples include: single engine; multiengine; land; water; gyroplane; helicopter; airship; and free balloon; and 

(2) As used with respect to the certification of aircraft, means a broad grouping of aircraft having similar characteristics of propulsion, flight, or landing. Examples include: airplane; rotorcraft; glider; balloon; landplane; and seaplane. 

Clearway. A defined rectangular area on the ground or water under the control of the appropriate authority, selected or prepared as a suitable area over which an aeroplane may make a portion of its initial climb to a specified height.
Clearway means:
(1) For turbine engine powered airplanes certificated after August 29, 1959, an area beyond the runway, not less than 500 feet wide, centrally located about the extended centerline of the runway, and under the control of the airport authorities.
The clearway is expressed in terms of a clearway plane, extending from the end of the runway with an upward slope not exceeding 1.25 percent, above which no object nor any terrain protrudes. However, threshold lights may protrude above the plane if their height above the end of the runway is 26 inches or less and if they are located to each side of the runway. 

(2) For turbine engine powered airplanes certificated after September 30, 1958, but before August 30, 1959, an area beyond the takeoff runway extending no less than 300 feet on either side of the extended centerline of the runway, at an elevation no higher than the elevation of the end of the runway, clear of all fixed obstacles, and under the control of the airport authorities. 

Clearance limit. The point to which an aircraft is granted an air traffic control clearance. 

Climb phase. The operating phase defined by the time during which the engine is operated in the climb operating mode. 

Climbout speed, with respect to rotorcraft, means a referenced airspeed which results in a flight path clear of the height/velocity envelope during initial climbout. 

Cloud of operational significance. A cloud with the height of cloud base below 1 500 m (5 000 ft) or below the highest minimum sector altitude, whichever is greater. 

Co-authority dispatch means the shared authority between the PIC and Flight Operation Officer in the formulation of an operational flight plan and flight release. 

Collision avoidance logic. The sub-system or part of ACAS that analyses data relating to an intruder and own aircraft, decides whether or not advisories are appropriate and, if so, generates the advisories. It includes the following functions: range and altitude tracking, threat detection and RA generation. It excludes surveillance. 

Commercial air transport means any public air transport for remuneration involving collection of fee. 

Commercial air transport operation. An aircraft operation involving the transport of passengers, cargo or mail for remuneration or hire. 

Commercial operator means a person who, for compensation or hire, engages in the carriage by aircraft in air commerce of persons or property, other than as an air carrier or foreign air carrier or under the authority. Where it is doubtful that an operation is for "compensation or hire", the test applied is whether the carriage by air is merely incidental to the person's other business or is, in itself, a major enterprise for profit. 

Common mark. A mark assigned by the International Civil Aviation Organization to the common mark registering authority registering aircraft of an international operating agency on other than a national basis. 

Common mark registering authority. The authority maintaining the non-national register or, where appropriate, the part thereof, in which aircraft of an international operating agency are registered.
 

Communication centre. An aeronautical fixed station which relays or retransmits telecommunication traffic from (or to) a number of other aeronautical fixed stations directly connected to it.
 

Competency Check. (CC). Any required operational check performed on company personnel (other than flight crewmembers), by company supervisory personnel duly authorized to perform that check. 

Company Check Pilot (CCP). An employee of an air carrier who is the holder of a delegation of authority issued by the Director, authorizing the conduct of certain types of flight checks. 

Commuter Air Carrier. any air carrier that provides an air transportation service on a scheduled basis. 

Consignment. One or more packages of dangerous goods accepted by an operator from one shipper at one time and at one address, receipted for in one lot and moving to one consignee at one destination address. 

Conference communications. Communication facilities whereby direct speech conversation may be conducted between three or more locations simultaneously. 

Configuration deviation list (CDL). A list established by the organization responsible for the type design with the approval of the State of Design which identifies any external parts of an aircraft type which may be missing at the commencement of a flight, and which contains, where necessary, any information on associated operating limitations and performance correction. 

Configuration (as applied to the aeroplane). A particular combination of the positions of the moveable elements, such as wing flaps and landing gear, etc., that affect the aerodynamic characteristics of the aeroplane. 

Configuration management. An ATN systems management facility for managers to change the configuration of remote elements. 

Congested area. In relation to a city, town or settlement, any area which is substantially used for residential, commercial or recreational purposes. 

Consultation. Discussion with a meteorologist or another qualified person of existing and/or expected meteorological conditions relating to flight operations; a discussion includes answers to questions. 

Context management (CM) server. An ATS facility that is capable of providing application information relating to other ATSUs to requesting aircraft or ATSUs. 

Context management (CM) application. An ATN application that provides a log-on service allowing initial aircraft introduction into the ATN and a directory of all other data link applications on the aircraft. It also includes functionality to forward addresses between ATS units. 

Contour line. A line on a map or chart connecting points of equal elevation. 

Contracting State. Any country or state, which is a signatory to the Convention of the International Civil Aviation Organization, or any other country acceptable to the Director.
 

Controlled airspace means an airspace of defined dimensions within which air traffic control service is provided to IFR flights and to VFR flights in accordance with the airspace classification. Note - Controlled airspace is a generic term that covers Class A, Class B, Class C, Class D, and Class E airspace. 

Control area. A controlled airspace extending upwards from a specified limit above the earth. 

Controlled aerodrome. An aerodrome at which air traffic control service is provided to aerodrome traffic. 

Controlled flight. Any flight which is subject to an air traffic control clearance. 

Controlled Firing Area. A controlled firing area is established to contain activities, which if not conducted in a controlled environment, would be hazardous to nonparticipating aircraft. 

Controller-pilot data link communications (CPDLC). A means of communication between controller and pilot, using data link for ATC communications. 

CPDLC application. An ATN application that provides a means of ATC data communication between controlling, receiving or downstream ATS units and the aircraft, using air-ground and ground-ground subnetworks, and which is consistent with the ICAO phraseology for the current ATC voice communication. 

Control zone. A controlled airspace extending upwards from the surface of the earth to a specified upper limit. 

Controlled Firing Area. A controlled firing area is established to contain activities, which if not conducted in a controlled environment, would be hazardous to nonparticipating aircraft. 

Co-pilot. A licensed pilot serving in any piloting capacity other than as pilot-in-command but excluding a pilot who is on board the aircraft for the sole purpose of receiving flight instruction. 

Core Curriculum - means a set of courses approved by the Director, for use by a training center and its satellite training centers. The core curriculum consists of training which is required for certification. It does not include training for tasks and circumstances unique to a particular user. 

Coulomb ©. The quantity of electricity transported in 1 second by a current of 1 ampere. 

Crewmember means a person assigned to perform duty in an aircraft during flight time or A person assigned by an operator to duty on an aircraft during a flight duty period.
 

Critical altitude means the maximum altitude at which, in standard atmosphere, it is possible to maintain, at a specified rotational speed, a specified power or a specified manifold pressure. Unless otherwise stated, the critical altitude is the maximum altitude at which it is possible to maintain, at the maximum continuous rotational speed, one of the following: 

(1) The maximum continuous power, in the case of engines for which this power 

      rating is the same at sea level and at the rated altitude. 

(2) The maximum continuous rated manifold pressure, in the case of engines, 

      the maximum continuous power of which is governed by a constant manifold pressure. 

Critical engine means the engine whose failure would most adversely affect the performance or handling qualities of an aircraft. 

Critical power-unit(s). The power-unit(s) failure of which gives the most adverse effect on the aircraft characteristics relative to the case under consideration. 

Cruise climb. An aeroplane cruising technique resulting in a net increase in altitude as the aeroplane mass decreases. 

Culture. All man-made features constructed on the surface of the Earth, such as cities, railways and canals. 

Current flight plan. The flight plan, including changes, if any, brought about by subsequent clearances. 

Current data authority. The designated ground system through which a CPDLC dialogue between a pilot and a controller currently responsible for the flight is permitted to take place. 

Cyclic redundancy check (CRC). A mathematical algorithm applied to the digital expression of data that provides a level of assurance against loss or alteration of data.