FAA Aircraft Dispatcher (ADX)Regulations (Part 121)Easy
A Part 121 turbine-powered airplane is equipped with a digital flight data recorder (FDR) installed to comply with 14 CFR 121.343. What is the minimum duration of flight data that the recorder must be capable of retaining?
- A25 hours
- B15 hours
- C50 hours
- D30 hours
Show answer & explanationAnswer & explanation
Correct answer: A. 25 hours
Under 14 CFR 121.343, flight data recorders must retain data for at least the last 25 hours of the recorder's operation, ensuring sufficient history is preserved for accident/incident investigation.
Why the other options are wrong
- B. 15 hours is below the regulatory minimum retention.
- C. 50 hours is not the standard required retention period.
- D. 30 hours exceeds the regulatory minimum, not the required figure.
FDR Retention (121.343)
Flight data recorders on Part 121 aircraft must be capable of retaining at least the last 25 hours of recorded flight data.
- Applies to turbine-powered airplanes required to have an FDR
- 25-hour minimum retention capability
- Distinct from CVR retention (2 hours under 121.359)
Memory trick: 'FDR = Far-reaching 25-hour Data Record.'