2010-06 · NASA ASRS report 892584
B757 Flight Crew experienced electrical anomalies at FL370 including loss of First Officer's ADI; HSI; and radios. Flight continued to destination and landed safely. Maintenance discovered a damaged circuit breaker (RT DC Bus) to be the cause.
We were enroute and level at FL370. We noticed R YAW DAMP EICAS message and below STATUS messages T-R and Warn Elex messages. We then noticed the First Officer had no ADI or HSI and no radios. We contacted Dispatch asking for a phone patch with Dispatch and Maintenance Control. Since we had only one radio; we were checking in with ATC while alternately talking with Maintenance. Maintenance asked us to check the First Officer's Instrument Transfer circuit breakers on the P-11 overhead panel. None were popped. We looked at the P6-3 panel and did not see any circuit breakers out. We discussed what might yet to be lost and whether a divert was best. We looked at the nearby airports. We were within a few miles of our destination; so we elected to continue. As Captain; I was way more comfortable with our destination and especially the emergency equipment and runway length available in case we lost additional equipment. Maintenance could not determine a cause; but said he would continue to research the problem and if he found anything he would contact us via ACARS. Dispatch said they would contact ATC and our destination Tower to alert them in case we were without the #1 Radio. Unsure of what was happening electrically; we conferred with Maintenance and Dispatch and decided to declare an emergency and continue. We were given expedited vectors and landed uneventfully on 34R. The Fire Equipment was waiting and we taxied to gate normally. When the Mechanics boarded the plane; they eventually looked at the lower P6-3 panel; and discovered that the RT DC Bus circuit breaker was pulled and bent forward. Apparently the circuit breaker had been inadvertently jerked out and bent in a position that from the First Officer's seat; the black head of the circuit breaker was facing him; so that no white was visible.
Cruising at 37000; R YAW DAMP EICAS message followed by status message T-R and warn ELEX message. Then First Officer lost the ADI and HSI; as well as the #2 radio. We looked for any popped out circuit breakers and found none. Thought about diverting; but after talking with dispatch and Maintenance; we continued to our destination. We declared an emergency to expedite our arrival; as well as the uncertainty of the problem that we had. Upon arrival; Mechanics found a circuit breaker out and bent forward; which was why when looking for the circuit breaker; it looked black and not the usual white. Circuit breaker was in on departure; so somewhere in flight; while moving my seat my bag may have pulled on the circuit breaker.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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