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A B767-300 flight crew reported multiple system failures. Maintenance was unable to pinpoint the problem and a decision to divert was made.
| Attributes | |
| ACN | 874362 |
| Time | |
| Date | 201002 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | Electrical Distribution |
| Person 1 | |
| Function | Pilot Flying First Officer |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 12000 Flight Crew Type 6300 |
| Person 2 | |
| Function | Pilot Not Flying Captain |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 16000 Flight Crew Type 6300 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
We were level at cruise FL360; about 2 hours into our flight. We started to lose numerous systems: left and center a/P; rudder ratio; ground prox; auto throttles; and auto speed brake. We had numerous EICAS messages and several status messages (acq flt computer; flap/slat elec). As pilot flying; I continued to hand fly while the captain talked to dispatch and maintenance. I did get the right a/P engaged. We ended up finding a sect #2 circuit breaker (left dc main bus section) out on the P6-1 panel on the side by the first officer. Captain could not get an answer as to what we lost or what was affected on the aircraft. It was also a breaker which was not authorized by maintenance to be reset once. Captain said to divert; so I made the request. We didn't know what we would or wouldn't have for the approach. We ran all our checklists on the descent for our current EICAS messages. We got several messages on final: flap load relief; trailing edge flaps; and we had no electric trim (I used manual trim levers); flaps and slats worked normally. Approach and landing were uneventful and we taxied to the gate. We did declare an emergency with center as we didn't know what systems were affected or working.
Original NASA ASRS Text
Title: A B767-300 flight crew reported multiple system failures. Maintenance was unable to pinpoint the problem and a decision to divert was made.
Narrative: We were level at cruise FL360; about 2 hours into our flight. We started to lose numerous systems: Left and Center A/P; Rudder Ratio; Ground Prox; Auto Throttles; and Auto speed brake. We had numerous EICAS messages and several status messages (ACQ Flt computer; Flap/Slat elec). As pilot flying; I continued to hand fly while the Captain talked to Dispatch and Maintenance. I did get the right A/P engaged. We ended up finding a Sect #2 circuit breaker (left DC main bus section) out on the P6-1 panel on the side by the First Officer. Captain could not get an answer as to what we lost or what was affected on the aircraft. It was also a breaker which was not authorized by Maintenance to be reset once. Captain said to divert; so I made the request. We didn't know what we would or wouldn't have for the approach. We ran all our checklists on the descent for our current EICAS messages. We got several messages on final: Flap Load Relief; Trailing Edge Flaps; and we had no electric trim (I used manual trim levers); Flaps and Slats worked normally. Approach and landing were uneventful and we taxied to the gate. We did declare an emergency with Center as we didn't know what systems were affected or working.
Data retrieved from NASA's ASRS site as of April 2012 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.