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If a transmission is reported to be strength 3, what quality would this represent?

  • A

    Unreadable

  • B

    Perfectly readable

  • C

    Readable but with difficulty

  • D

ICAO Doc 9432 
2.8.4 Test procedures 
2.8.4.1 Test transmissions should take the following form:

a) the identification of the aeronautical station being called; 
b) the aircraft identification; 
c) the words “RADIO CHECK”; and 
d) the frequency being used.

2.8.4.2 Replies to test transmissions should be as follows:

a) the identification of the station calling; 
b) the identification of the station replying; and 
c) information regarding the readability of the transmission.

2.8.4.3 The readability of transmissions should be classified in accordance with the following readability scale:

1. Unreadable. 
2. Readable now and then. 
3. Readable but with difficulty. 
4. Readable. 
5. Perfectly readable.

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