FAA Aircraft Dispatcher (ADX)Regulations (Part 121)Medium
A Part 121 flight is experiencing an in-flight engine shutdown due to an uncontained failure. Under 14 CFR 121.703, when must a Mechanical Reliability Report (MRR) be filed for this event?
- AWithin 12 hours of the event.
- BWithin 48 hours of the event.
- CWithin 72 hours of the event.
- DWithin 24 hours of the event.
Show answer & explanationAnswer & explanation
Correct answer: D. Within 24 hours of the event.
14 CFR 121.703(d) requires that each certificate holder must submit a mechanical reliability report (MRR) for an unscheduled engine removal (which an uncontained engine failure would necessitate) within 24 hours of the engine removal from the aircraft.
Why the other options are wrong
- A. 12 hours is not the specified timeframe for this type of event; however, some other reports might have different timelines.
- B. 48 hours is not the specified timeframe for this type of event.
- C. 72 hours is not the specified timeframe for this type of event.
Mechanical Reliability Reports (121.703)
Mandatory reports filed by Part 121 certificate holders to the FAA regarding significant mechanical failures or malfunctions that affect airworthiness or operational safety.
- Required for specific mechanical irregularities.
- Timelines vary based on severity of event.
- Aids in identifying trends and improving safety.
Memory trick: MRR: 'M' for Mechanical, 'R' for Report, 'R' for Rapid submission. Unscheduled engine removal is a '24-hour' urgency.