What is the time limit for which information can be retained on a cockpit voice recorder?

The correct answer reflects the requirement established for cockpit voice recorders (CVRs) as outlined by aviation regulations. A CVR is designed to capture audio from the cockpit, including conversations between the flight crew and any ambient sounds. The retention time specifically delineated in regulations is 30 minutes. This timeframe is significant because it ensures that critical audio data is available for investigation in the event of an incident, allowing authorities to access recent flight crew communications.

The 30-minute window is essential for providing a buffer that captures the various phases of flight, which can include crucial decision-making moments that occur shortly before an event. This regulation strikes a balance between the need for data retention and the technical limitations of storage capacity for the recording devices used in aircraft.

The other options reflect timeframes that do not align with the standard for CVR retention, making them unsuitable for this context. By adhering to the 30-minute guideline, aviation safety agencies ensure effective monitoring and investigation procedures are in place.