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Md-11 captain reported multiple electrical system anomalies; and is concerned that maintenance apparently cannot determine the cause.
| Attributes | |
| ACN | 1668402 |
| Time | |
| Date | 201907 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Electrical Power |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
At approximately 15;000 feet descending on arrival to 4000 feet the gen 1 off; gen 2 off; gen 3 off level 1 alerts all came on for about 1 second. After approximately 1 second the alerts extinguished and all buses and idg's appeared to be operating normally. Passing 8;000 feet the auto-throttles failed and indicated amber on flight display. While on downwind at 4;000 feet the autopilots failed; received 'unable rnp' message and lost both flight directors. The airplane was flying normally and no bus failure indications were noted on the display. We configured early [and] flew a visual approach. On final check airmen noticed that first officer map display indicated almost 2 miles east of our actual position. Landing was uneventful except that HUD flare did not occur. The airplane had a differed aux inertial. And on the previous leg the auto brakes had failed and they too were deferred. I think something is not right with the inertial nav systems in the airplane. When we landed I had maintenance meet the airplane and they indicated to me that there were no faults in the system. Something is badly wrong with this airplane. I was fortunate that it was a very nice day with light winds otherwise this could have been a more problematic flight.
Original NASA ASRS Text
Title: MD-11 Captain reported multiple electrical system anomalies; and is concerned that Maintenance apparently cannot determine the cause.
Narrative: At approximately 15;000 feet descending on arrival to 4000 feet the Gen 1 OFF; Gen 2 OFF; Gen 3 OFF level 1 alerts all came on for about 1 second. After approximately 1 second the alerts extinguished and all buses and IDG's appeared to be operating normally. Passing 8;000 feet the auto-throttles failed and indicated amber on flight display. While on downwind at 4;000 feet the autopilots failed; received 'Unable RNP' message and lost both flight directors. The airplane was flying normally and no bus failure indications were noted on the display. We configured early [and] flew a visual approach. On final check airmen noticed that First Officer Map display indicated almost 2 miles east of our actual position. Landing was uneventful except that HUD flare did not occur. The airplane had a differed Aux inertial. And on the previous leg the auto brakes had failed and they too were deferred. I think something is not right with the inertial nav systems in the airplane. When we landed I had Maintenance meet the airplane and they indicated to me that there were no faults in the system. Something is badly wrong with this airplane. I was fortunate that it was a very nice day with light winds otherwise this could have been a more problematic flight.
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.