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On the readability scale what does "Readability 5" mean?
  • A
    Unreadable.
  • B
    Problem to understand.
  • C
    Readable but with difficulty.
  • D
    Perfectly readable.

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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