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Captain reported multiple aircraft status messages in flight and a failure of the autopilot caused an overspeed condition.
| Attributes | |
| ACN | 1741323 |
| Time | |
| Date | 202004 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | System Monitor: Indicating and Warning |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Total 15000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Speed All Types |
Narrative:
We noticed several status messages during the flight: flap/slat control 1; flap/slat position sensors and a few others. We contacted tech [operations] and discussed. Decision was made to continue and possible options. As we approached ZZZ we were cleared the arrival; visual xxr and cleared to descend to fl 240. As we approached T/D (top of descent) VNAV path engaged and descent began. ATC then cleared us direct zzzzz 12000 and comply with altitude restrictions on arrival. I selected direct zzzzz with abeam points; executed/LNAV. FMC showed direct zzzzz with no abeam points. I then advised my first officer (first officer) that I would activate route 2 rebuild arrival and try again. The result was the same. We decided to use the fix page and monitor our altitudes. Suddenly; we see red and hear aural warnings of overspeed. The VNAV indicator on the pfd was yellow with a line thru it. I immediately pulled the speed brakes and throttles were at idle. The aircraft speed was reduced. We figured the VNAV failure caused the loss of speed protection. VNAV failed to re-engage until on final approach when it engaged without being selected. After gate arrival our mechanics met the plane. After we explained what occurred the mechanics advised the aircraft has a history of items related to our events. Knowing the history of the aircraft could assist crews. However; multiple failures and their relationship with each other is a challenge for all.
Original NASA ASRS Text
Title: Captain reported multiple aircraft status messages in flight and a failure of the autopilot caused an overspeed condition.
Narrative: We noticed several status messages during the flight: Flap/Slat control 1; Flap/Slat position sensors and a few others. We contacted Tech [OPS] and discussed. Decision was made to continue and possible options. As we approached ZZZ we were cleared the Arrival; Visual XXR and cleared to descend to FL 240. As we approached T/D (top of descent) VNAV path engaged and descent began. ATC then cleared us direct ZZZZZ 12000 and comply with altitude restrictions on arrival. I selected direct ZZZZZ with abeam points; executed/LNAV. FMC showed direct ZZZZZ with no abeam points. I then advised my FO (First Officer) that I would activate route 2 rebuild arrival and try again. The result was the same. We decided to use the Fix page and monitor our altitudes. Suddenly; we see red and hear aural warnings of overspeed. The VNAV indicator on the PFD was yellow with a line thru it. I immediately pulled the speed brakes and throttles were at idle. The aircraft speed was reduced. We figured the VNAV failure caused the loss of speed protection. VNAV failed to re-engage until on final approach when it engaged without being selected. After gate arrival our mechanics met the plane. After we explained what occurred the mechanics advised the aircraft has a history of items related to our events. Knowing the history of the aircraft could assist crews. However; multiple failures and their relationship with each other is a challenge for all.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.