B757 flight crew experienced electrical anomalies at FL370 including loss of first officer's ADI; HS...

Narrative:

We were enroute and level at FL370. We noticed right 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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

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.

Attributes
ACN	892584
Time
Date	201006
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Electrical/Electronic Panel & Parts
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 16000 Flight Crew Type 5100
Person 2
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 13000 Flight Crew Type 400
Events
Anomaly	Aircraft Equipment Problem Less Severe

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.