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You request a radio check and ATC reply that they read you now and then, which is _____ on the readability scale. Later, you change your headset and recall ATC, who now reply that you are perfectly readable, which is _____ on the readability scale.

  • A

    2 and 5

  • B

    3 and 4

  • C

    5 and 2

  • D

    3 and 5

ICAO Annex 10 — Aeronautical Telecommunications
Chapter 5
5.2.1.8.4 PANS.— When the tests are made, the following readability scale should be used:

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

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