The DFDR can store flight data for at least how many hours?

The DFDR can store flight data for at least how many hours?

• A. 20
• B. 25
• C. 30
• D. 15

Answer: (B)

The DFDR memory duration is what this item tests. On an A320, the DFDR is specified to store flight data for at least 25 hours, providing a sufficient window to review recent performance and events, even on longer flights. This data includes key parameters like airspeed, altitude, attitude, engine values, and system statuses, all recorded in a rolling history so investigators can reconstruct flight activity after any event. The 25-hour minimum is chosen because it balances practical memory limitations with the need for a meaningful interval to analyze a flight. Options with shorter durations wouldn’t guarantee enough data for longer sectors or investigations, while a longer duration isn’t required by the standard minimum. Hence, 25 hours is the correct specification.

The DFDR memory duration is what this item tests. On an A320, the DFDR is specified to store flight data for at least 25 hours, providing a sufficient window to review recent performance and events, even on longer flights. This data includes key parameters like airspeed, altitude, attitude, engine values, and system statuses, all recorded in a rolling history so investigators can reconstruct flight activity after any event. The 25-hour minimum is chosen because it balances practical memory limitations with the need for a meaningful interval to analyze a flight. Options with shorter durations wouldn’t guarantee enough data for longer sectors or investigations, while a longer duration isn’t required by the standard minimum. Hence, 25 hours is the correct specification.