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The pilot of an aircraft at an altitude of 4500 ft should transmit it as...

  • A

    four five zero zero.

  • B

    four five tousand.

  • C

    four tousand five zero zero.

  • D

    four tousand five hundred.

ICAO Annex 10 Volume II
5.2.1.4 TRANSMISSION OF NUMBERS IN RADIOTELEPHONY

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.

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

altitude 4500 → four tousand five hundred

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