ATC AP Characteristics Practice Test

How are altitudes pronounced?

Say the altitude as a single number Read the altitude as a spelled-out word Pronounce each digit of hundreds or thousands with the appropriate tail on each (One seven thousand niner hundred) Omit digits when pronouncing altitude

Correct Answer:

Pronounce each digit of hundreds or thousands with the appropriate tail on each (One seven thousand niner hundred)

Explanation:

Altitudes are spoken digit by digit with the magnitude words (thousand, hundred) placed after the appropriate digits, to keep transmissions unambiguous. For an altitude like 17,900, you’d say “one seven thousand niner hundred.” Each digit is stated: 1, then 7, followed by “thousand” to mark the thousands group, then 9 is spoken as “niner” to avoid confusion with other digits, and finally “hundred” after the 9 to indicate the hundreds place. Any trailing zeros aren’t spoken. This approach minimizes mishearing in radio transmissions, whereas saying the number as a single word, spelling it out, or omitting digits could lead to mistakes.

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