Optimum duration of ATIS.

• A. 10 sec
• B. 20 sec
• C. 60 sec
• D. 30 sec

Answer: (D)

ATIS broadcasts are meant to deliver essential airport information quickly and efficiently, so the duration should be long enough to include the main items but short enough to keep the frequency available for others. A 30-second broadcast hits that balance well: it provides the key details—weather, winds, altimeter, active runway, and any notable NOTAMs—in a concise package without taking up excessive airtime. If the duration is too short, like ten or twenty seconds, important items can get left out or pilots must request more information. If it’s too long, such as sixty seconds, it ties up the channel longer than necessary and makes updates slower to propagate. That’s why thirty seconds is the standard you’ll encounter in practice.