NTSB Identification: LAX84LA349.
The docket is stored on NTSB microfiche number 27437.
Scheduled 14 CFR Part 121: Air Carrier PAN AMERICAN WORLD AIRWAYS INC
Accident occurred Monday, June 11, 1984 in LOS ANGELES, CA
Aircraft: LOCKHEED L-1011-385-3, registration: N501PA
Injuries: 157 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
SHORTLY AFTER THE AIRCREW MOVED THE GEAR HANDLE FROM 'UP' TO 'OFF', DURING INITIAL CLIMB, THEY HEARD A LOUD BANG IN THE NOSEWHEEL AREA. THEY RETURNED TO THE ARPT & LANDED AFTER DUMPING FUEL. AN EXAM REVEALED THAT BOTH LOWER ATTACH LUGS ON THE NOSE GEAR CRANK ASSEMBLY HAD FAILED & ALLOWED THE RETRACT ACTUATOR ARM TO PENETRATE THE WHEEL WELL BULKHEAD & CARGO COMPARTMENT FLOOR. A METALLURGICAL EXAM REVEALED THAT THE LEFT LUG HAD FAILED IN OVERLOAD AFTER FAILURE OF THE RIGHT LUG. THE FRACTURE SURFACE OF THE RIGHT LUG WAS TOO BADLY DAMAGED FOR AN EVALUATION; HOWEVER, SOME INTERGRANULAR CORROSION WAS NOTED IN THE REMAINING FRACTURE FACE.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:LANDING GEAR,NORMAL RETRACTION/EXTENSION ASSEMBLY..FAILURE,TOTAL
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