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B747 flight crew experiences failure of the dc distribution bus 1 in cruise. After contacting maintenance control it is discovered that a circuit breaker had tripped and was likely caused by the ipad ram mount; on the floor; hitting it. The circuit breaker is reset.
| Attributes | |
| ACN | 1238238 |
| Time | |
| Date | 201502 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | RJJJ.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Circuit Breaker / Fuse / Thermocouple |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 160 Flight Crew Total 18000 Flight Crew Type 9500 |
| Person 2 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 19000 Flight Crew Type 15000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
During cruise the dc distribution bus 1 breaker no.1 popped. This caused the loss of the c autopilot; LNAV and VNAV. We had a number of caution and status messages; all appeared to be not related in any specific way. I flew the aircraft as the captain contacted maintenance. We found the breaker out and the first officer ipad ram mount in the vicinity of the breaker. We suspect that the mount was pushed against the breaker causing it to pop. The breaker was reset after maintenance consult. All systems returned except no 1 engine eec which remained in the altn mode. There is no specific place or sop location to stow an unused ram mount.
Original NASA ASRS Text
Title: B747 flight crew experiences failure of the DC Distribution bus 1 in cruise. After contacting Maintenance Control it is discovered that a circuit breaker had tripped and was likely caused by the iPad ram mount; on the floor; hitting it. The circuit breaker is reset.
Narrative: During cruise the DC distribution bus 1 breaker no.1 popped. This caused the loss of the c autopilot; LNAV and VNAV. We had a number of caution and status messages; all appeared to be not related in any specific way. I flew the aircraft as the Captain contacted maintenance. We found the breaker out and the First Officer iPad RAM mount in the vicinity of the breaker. We suspect that the mount was pushed against the breaker causing it to pop. The breaker was reset after maintenance consult. All systems returned except no 1 engine EEC which remained in the altn mode. There is no specific place or sop location to stow an unused ram mount.
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.