When does the ATIS identification code start over?

When does the ATIS identification code start over?

• A. When broadcast interrupted for 8 hours or less
• B. At midnight local time
• C. At 2400 UTC
• D. When broadcast interrupted for more than 12 hours

Answer: (D)

ATIS identification is a repeating letter that marks successive broadcasts of airport information. Each new ATIS transmission uses the next letter in the sequence, signaling to pilots that the data has been updated. When the ATIS is interrupted for more than 12 hours, the sequence resets when service resumes, so the next broadcast starts again with the initial letter. Short outages don’t reset the sequence, so the ongoing cycle continues. This is why the correct rule is that the code starts over after a broadcast interruption longer than 12 hours.

ATIS identification is a repeating letter that marks successive broadcasts of airport information. Each new ATIS transmission uses the next letter in the sequence, signaling to pilots that the data has been updated. When the ATIS is interrupted for more than 12 hours, the sequence resets when service resumes, so the next broadcast starts again with the initial letter. Short outages don’t reset the sequence, so the ongoing cycle continues. This is why the correct rule is that the code starts over after a broadcast interruption longer than 12 hours.