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Radio communicationsQuestion 796 of 934

A pilot may use a UNICOM station to pass an ATC message in which case?

  1. To request radar vectors around traffic
  2. To receive radar traffic advisories
  3. To pass a revised departure time
  4. To ask ATC for a new transponder code
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Correct answer: To pass a revised departure time

UNICOM may pass ATC messages only for a revised departure time, takeoff, arrival or cancellation times, or an arranged clearance.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 4-1-12 Use of UNICOM for ATC Purposes, page 212

Practice radio communications

Questions last reviewed: 18 October 2026