Communications Definitions

Question 1

Aeronautical broadcasting service

Answer 1

A broadcasting service intended for the transmission of information relating to air navigation.

Question 2

Aeronautical Fixed Service

Answer 2

A telecommunication service between specified fixed points provided primarily for the safety of air navigation and for the regular, efficienct and economical operation of air services.

Question 3

Aeronautical fixed telecommunication network

Answer 3

A worldwide system of aeronautical fixed circuits provided, as part of the aeronautical fixed service, for the exchange of messages and/or digital data between aeronautical fixed stations having the same or compatible communications characteristics.

Question 4

Aeronautical mobile service

Answer 4

A mobile service between aeronautical stations and aircraft stations, or between aircraft stations, in which survival craft stations may participate; emergency position indicating radiobeacon stations may also participate in this service on designated distress and emergency frequencies.

Question 5

Aeronautical mobile service (R)

Answer 5

An aeronautical mobile service reserved for communications relating to safety and regularity of flight, primarily along national or international civil air routes.

Question 6

Aeronautical Telecommunication service

Answer 6

A telecommunication service provided for any aeronautical purpose.

Question 7

International telecommunication service

Answer 7

A telecommunication service between offices or stations of different states, or between mobile stations which are not in the same State, or are subject to different states.

Question 8

Aeronautical fixed station

Answer 8

A station in the aeronautical fixed service

Question 9

Aeronautical telecommunication station

Answer 9

A station in the aeronautical telecommunication service.

Question 10

AFTN origin station

Answer 10

An AFTN station where messages and/or digital data are accepted for transmission over the AFTN.

Question 11

Air Ground Control Radio Station

Answer 11

An aeronautical telecommunication station having primary responsibility for handling communications pertaining to the operation and control of aircraft in a given area

Question 12

Aircraft station

Answer 12

A mobile station in the aeronautical mobile service, other than a survival craft station, located on board an aircraft.

Question 13

Network Station

Answer 13

An aeronautical station forming a part of a radiotelephony network

Question 14

Air ground communication

Answer 14

Two way communication between aircraft and stations or locations on the surface of the earth.

Question 15

Blind Transmission

Answer 15

A transmission from one station to another station in circumstances where two way communication cannot be established but where it is believed that the called station is able to receive the transmission

Question 16

Broadcast

Answer 16

A transmission of informationrelating to air navigation that is not addressed to a specific station or stations

Question 17

Duplex

Answer 17

A method in which telecommunication between two stations can take place in both directions simultaneously.

Question 18

Ground to air communications

Answer 18

One way communication from stations or locations on the surface of the earth to aircraft.

Question 19

Radiotelephony network

Answer 19

A group of radiotelephony aeronautical stations which operate on and guard frequencies from the same family and which support each other in a defined manner to ensure maximum dependability of air ground communications and dissemination of air ground traffic

Question 20

Readback

Answer 20

A procedure whereby the receving station repeats a recevied message or an appropriate part thereof back to the transmitting station so as to obtain confirmation of correct reception.

Question 21

Simplex

Answer 21

A method in which telecommunication between two stations takes place in one direction at a time.

Question 22

Telecommunication

Answer 22

Any transmission, emission or reception of signs, signals, writing, images, and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems.

Question 23

Aeronautical telecommunication agency

Answer 23

An agency responsible for operating a station or stations in the aeronautical telecommunication service.

Question 24

Air report

Answer 24

A report from an aircraft in flight prepared in conformity with requirements for position, and operational and/or meteorological reporting.

Question 25

Aircraft operating agency

Answer 25

The person, organizaiton or enterprise engaed in or offering to engage in, an aircraft operation.

Question 26

ATS direct speech circuit

Answer 26

An aeronautical fixed service telephone circuit, for direct exchange of information between air traffic services units.

Question 27

Primary frequency

Answer 27

The radiotelephony frequency assigned to an aircraft as a first choice for air ground communication in a radiotelephony network.

Question 28

Secondary frequency

Answer 28

The radiotelephony frequency assigned to an aircraft as a second choice for air ground communication in a radiotelephony network.