A B757-200 flight crew experienced the loss of the left generator and associated bus while on approa...

Narrative:

We were being vectored to intercept the xxr localizer. Suddenly; we lost most of the flight and engine instruments. We aborted the approach and asked for vectors so we could figure out what happened. We were given instructions to climb to 4000 feet. We climbed and while doing so saw that we had lost the left generator and the left AC bus. We went through the QRH procedure and were able to restore power to the aircraft. We were vectored around for another approach and landed without further incident. The incident was written up in the maintenance log and was explained to a mechanic.

Original NASA ASRS Text

Title: A B757-200 Flight Crew experienced the loss of the left generator and associated bus while on approach. They executed a missed approach; ran the appropriate checklists restoring power to the lost buses and landed uneventfully.

Narrative: We were being vectored to intercept the XXR localizer. Suddenly; we lost most of the flight and engine instruments. We aborted the approach and asked for vectors so we could figure out what happened. We were given instructions to climb to 4000 feet. We climbed and while doing so saw that we had lost the left generator and the left AC bus. We went through the QRH procedure and were able to restore power to the aircraft. We were vectored around for another approach and landed without further incident. The incident was written up in the maintenance log and was explained to a mechanic.

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	947464
Time
Date	201105
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	AC Generator/Alternator
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

A B757-200 flight crew experienced the loss of the left generator and associated bus while on approach. They executed a missed approach; ran the appropriate checklists restoring power to the lost buses and landed uneventfully.