NTSB Identification: CHI82IA026
Scheduled 14 CFR Part 121: Air Carrier operation of TRANS WORLD AIRLINES
Incident occurred Tuesday, January 12, 1982 in CHICAGO, IL
Probable Cause Approval Date: 01/12/1983
Aircraft: LOCKHEED L-1011, registration: N31031
Injuries: 149 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ELECTRICAL SYSTEM,GENERATOR..OTHER

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ELECTRICAL SYSTEM,ELECTRIC RELAY..SHORTED


Contributing Factors

ELECTRICAL SYSTEM,GENERATOR..DISABLED

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