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Radio communicationsQuestion 248 of 934

When should a pilot not abbreviate an aircraft call sign?

  1. At any time while the pilot is on a CTAF frequency
  2. On first contact or when call signs sound alike
  3. Only at night, when visibility is poor
  4. Only after the first contact with ATC
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Correct answer: On first contact or when call signs sound alike

Call signs must never be shortened on initial contact or when other call signs have similar numbers or letters.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 4-2-4 Aircraft Call Signs, page 229

Practice radio communications

Questions last reviewed: 18 October 2026