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Which of these has to be transmitted by pronouncing each digit separately?
  • A
    Ceiling overcast 1300 ft
  • B
    Altitude 2500 ft
  • C
    Visibility 4000 m
  • D
    QNH 1001

Refer to figures.
ICAO Annex 10 — Aeronautical Telecommunications
Chapter 5

5.2.1.4.1.3. The altimeter setting shall be transmitted by pronouncing each digit separately except for the case of a setting of 1000 hPa which shall be transmitted as ONE THOUSAND.
Note: The following examples illustrate the application of this procedure (see 5.2.1.4.3.1 for pronunciation).

Altimeter settingTransmitted as
1009QNH one zero zero nine
1000QNH one thousand
993QNH nine nine three

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