Narrative:

The two relief pilots had just gotten in their respective places and I was standing in the middle just behind them when three (3) EICAS messages appeared on the upper center screen at once. They were as follows: 1) auto throttle disc 2) hyd control 4 3) hyd dem 1. We brought up the hydraulic schematic to find that there was no hydraulic indication; no pressure or temperature; no pressure or temperature lights. There were also about (12) status messages on the lower screen. We ran the individual check lists for EICAS items one at a time and found that this had not helped improve the issues. I next searched the circuit breaker panels and found one breaker popped. It was labeled 'DC1 dist' and was located on the P6-5 panel at position A10. I called dispatch on the satcom and had him bring maintenance control into our conversation after I had described the problem. Maintenance control said that this aircraft had no history such as this and after checking his reference material and schematics said that all the EICAS items were controlled by that breaker. He said that he could not see any problem with resetting the breaker as long as neither the flight attendants nor ourselves hadn't smelled any unusual smells or smoke during the event; but that I would have to use captains emergency authority to reset the breaker in flight. After discussing it with the other two pilots; I decided to do just that. After the reset all systems returned to normal condition and there was no further problem throughout the flight.

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Original NASA ASRS Text

Title: The DC1 DIST circuit breaker on a B747-400's P6-5 panel at position A10 was found popped after the EICAS indicated AUTOTHROTTLE and HYDRAULIC system problems. The circuit breaker was reset and all system indications returned to normal.

Narrative: The two relief pilots had just gotten in their respective places and I was standing in the middle just behind them when three (3) EICAS messages appeared on the upper center screen at once. They were as follows: 1) Auto Throttle Disc 2) Hyd Control 4 3) Hyd Dem 1. We brought up the hydraulic schematic to find that there was no hydraulic indication; no pressure or temperature; no pressure or temperature lights. There were also about (12) status messages on the lower screen. We ran the individual check lists for EICAS items one at a time and found that this had not helped improve the issues. I next searched the circuit breaker panels and found one breaker popped. It was labeled 'DC1 Dist' and was located on the P6-5 panel at position A10. I called Dispatch on the SATCOM and had him bring Maintenance Control into our conversation after I had described the problem. Maintenance Control said that this aircraft had no history such as this and after checking his reference material and schematics said that all the EICAS items were controlled by that breaker. He said that he could not see any problem with resetting the breaker as long as neither the Flight Attendants nor ourselves hadn't smelled any unusual smells or smoke during the event; but that I would have to use Captains Emergency Authority to reset the breaker in flight. After discussing it with the other two pilots; I decided to do just that. After the reset all systems returned to normal condition and there was no further problem throughout the flight.

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.