CHICAGO, IL, USA
N31031
LOCKHEED L-1011
THE AIRCRAFT HAD DEPARTED BOSTON ON A SCHEDULED FLIGHT WITH THE #1 GENERATOR PLACARDED INOPERATIVE AND NOTED IN THE MINIMUM EQUIPMENT LIST. EN ROUTE TO LOS ANGELES, CA AT FL 350, ABOUT 80 MI NORTHEAST OF BAY CITY, MN., THE CREW NOTED A SIMULTANEOUS LOSS OF #2 AND #3 GENERATORS AND ALL AC POWER. AFTER EXECUTING THE EMERGENCY PROCEDURES AND RESTORING POWERVIA THE APU, THE FLIGHT DIVERTED TO CHICAGO, IL AND MADE A NORMAL LANDING. INVESTIGATION REVEALED THAT THE NUMBER THREE GENERATOR HAD AN OPEN FIELD LINING AND THE NUMBER TWO GENERATOR CONTROL UNIT HAD A DEFECTIVE "A" PHASE. THE #1 GENERATORHAD EXPERIENCE A SPRAGUE CLUTCH FAILURE.
Source: NTSB Aviation Accident Database
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