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If FL180 is available, what is the appropriate ATC reply to the message “BIGJET 361, request FL180.”?
  • A
    BIGJET 361, climb flight level eighteen zero.
  • B
    BIGJET 361, climb flight level one eight zero.
  • C
    BIGJET 361, climb flight level one hundred and eighty.
  • D
    BIGJET 361, climb flight level one eighty.

ICAO Annex 10 Volume II
CHAPTER 5. AERONAUTICAL MOBILE SERVICE — VOICE COMMUNICATIONS
5.2.1.4.1 TRANSMISSION OF NUMBERS

5.2.1.4.1.1 All numbers, except as prescribed in 5.2.1.4.1.2, shall be transmitted by pronouncing each digit separately.

Note.— The following examples illustrate the application of this procedure (see 5.2.1.4.3.1 for pronunciation).

flight levelstransmitted as
FL180flight level one eight zero
FL200flight level two zero zero


5.2.1.4.1.2 All numbers used in the transmission of altitude, cloud height, visibility and runway visual range (RVR) information, which contain whole hundreds and whole thousands, shall be transmitted by pronouncing each digit in the number of hundreds or thousands followed by the word HUNDRED or THOUSAND as appropriate. Combinations of thousands and whole hundreds shall be transmitted by pronouncing each digit in the number of thousands followed by the word THOUSAND followed by the number of hundreds followed by the word HUNDRED.

Note.— The following examples illustrate the application of this procedure (see 5.2.1.4.3.1 for pronunciation).

altitudetransmitted as
800eight hundred
3 400three thousand four hundred
12 000one two thousand

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