ICAO Annex 10
Volume II
Chapter 5
5.2.1.8.4 PANS.- When the tests are made, the following readability scale should be:
Readability Scale
1 Unreadable
2 Readable now and then
3 Readable but with difficulty
4 Readable
5 Perfectly readable
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This question has appeared on the real examination, you can find the related countries below.
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France14
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Austro Control10
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Greece8
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Poland8
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Sweden6
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Lithuania3
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Spain3
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Bulgaria2
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Italy2
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Norway2
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Switzerland2
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Iceland1
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Ireland1
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San Marino1