Narrative:

In cruise at FL330, the transfer bus (#1 normal) circuit breaker popped, leaving the cockpit with what appeared a loss of both engine generators. Standby instruments and lights were the only ones left operating. This also included the loss of all indicator lights on the overhead ('generator off bus,' 'bus off,' lights, etc). Crew scanned circuit breaker panel but did not see the transfer bus circuit breaker and then ran the 'loss of all engine driven generators' checklist. This produced no results and the flight diverted to slc. While descending into slc, a second scan for circuit breakers was done and the transfer bus circuit breaker was found, reset and all power was restored. Landing accomplished with no further incident. Since this peculiar condition looks to the crew like a loss of generators except that the indicator and warning lights are out, a note in the checklist for loss of all generators to check transfer bus circuit breakers would solve the whole problem right then.

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Original NASA ASRS Text

Title: THIS MLG ACR PLT THOUGHT THAT HE HAD A LOSS OF BOTH ENG GENERATORS WHEN IN FACT HE HAD 1 POPPED CIRCUIT BREAKER THAT LOOKED LIKE A COMPLETE GENERATOR FAILURE. THE CIRCUIT BREAKER WAS RESET. THE ACFT WAS ALREADY DIVERTING TO AN AIRFIELD ENRTE. THE PLT MAKES A GOOD SENSE SUGGESTION CHANGE TO THE EMER CHKLIST.

Narrative: IN CRUISE AT FL330, THE TRANSFER BUS (#1 NORMAL) CIRCUIT BREAKER POPPED, LEAVING THE COCKPIT WITH WHAT APPEARED A LOSS OF BOTH ENG GENERATORS. STANDBY INSTS AND LIGHTS WERE THE ONLY ONES LEFT OPERATING. THIS ALSO INCLUDED THE LOSS OF ALL INDICATOR LIGHTS ON THE OVERHEAD ('GENERATOR OFF BUS,' 'BUS OFF,' LIGHTS, ETC). CREW SCANNED CIRCUIT BREAKER PANEL BUT DID NOT SEE THE TRANSFER BUS CIRCUIT BREAKER AND THEN RAN THE 'LOSS OF ALL ENG DRIVEN GENERATORS' CHKLIST. THIS PRODUCED NO RESULTS AND THE FLT DIVERTED TO SLC. WHILE DSNDING INTO SLC, A SECOND SCAN FOR CIRCUIT BREAKERS WAS DONE AND THE TRANSFER BUS CIRCUIT BREAKER WAS FOUND, RESET AND ALL PWR WAS RESTORED. LNDG ACCOMPLISHED WITH NO FURTHER INCIDENT. SINCE THIS PECULIAR CONDITION LOOKS TO THE CREW LIKE A LOSS OF GENERATORS EXCEPT THAT THE INDICATOR AND WARNING LIGHTS ARE OUT, A NOTE IN THE CHKLIST FOR LOSS OF ALL GENERATORS TO CHK TRANSFER BUS CIRCUIT BREAKERS WOULD SOLVE THE WHOLE PROBLEM RIGHT THEN.

Data retrieved from NASA's ASRS site as of July 2007 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.