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What should the pilot`s read back be for the instruction "Climb to FL 280?"?
  • A
    Climbing to two eighty.
  • B
    Climbing to flight level two eighty.
  • C
    Climbing two eight zero.
  • D
    Climbing to flight level two eight zero.

Refer to figure.
ICAO Annex 10 — Aeronautical Telecommunications
Chapter 5
5.2.1.4 Transmission of numbers in radiotelephony
5.2.1.4.1 Transmission of numbers

5.2.1.4.1.2. Flight levels shall be transmitted by pronouncing each digit separately except for the case of flight levels in whole hundreds, which shall be transmitted by pronouncing the digit of the whole hundred followed by the word HUNDRED.

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

Flight levels Transmitted as
FL 180 Flight level one eight zero
FL 200 Flight level two hundred

  • Climb to FL 280 => Climbing to flight level two eight zero

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