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American Airlines 191

Printed page 70. PDF page 74.

recommended by the Douglas Aircraft Company Service Bulletin which include removing the engine from the pylon before' removing the pylon from the wing..: |(Class I, Urgent Action) (A-79-46) Issue a Maintenance Alert Bulletin to U.S. certificated air ‘carriers, and notify
Open official document at PDF page 74NTSB AAR-79/17: American Airlines DC-10-10 N110AA, Chicago

American Airlines 191

Printed page Report front matter. PDF page 2.

weather was clear and the visibility was 15 miles. During the takeoff rotation, the left engine and pylon assembly and about 3 ft of the leading edge of the left wing separated from the aircraft and fell to the runway.
Open official document at PDF page 2NTSB AAR-79/17: American Airlines DC-10-10 N110AA, Chicago

American Airlines 191

Printed page label not indexed. PDF page 3.

systems resulting from maintenance-induced damage leading to the separation of the No.1 engine and pylon assembly at a critical point during takeoff. The separation resulted from damage by improper maintenance procedures which led to failure of the pylon structure. Contrib
Open official document at PDF page 3NTSB AAR-79/17: American Airlines DC-10-10 N110AA, Chicago

American Airlines 191

Printed page label not indexed. PDF page 5.

weather was clear and the visibility was 15 miles. During the takeoff rotation, the left engine and pylon assembly and about 3 ft of the leading edge of the left wing ‘separated from the aircraft and fell to the runway.
Open official document at PDF page 5NTSB AAR-79/17: American Airlines DC-10-10 N110AA, Chicago

American Airlines 191

Printed page label not indexed. PDF page 15.

the point where the forward part of the pylon joined the wing, was torn away when the engine pylon assembly separated from the aircraft. The No. 1 and No. 3 hydraulic system's extension and retraction lines and the followup cables
Open official document at PDF page 15NTSB AAR-79/17: American Airlines DC-10-10 N110AA, Chicago

American Airlines 191

Printed page label not indexed. PDF page 31.

during the time the procedure was in use, several McDonnell- Douglas employees saw the engine and pylon assembly after it was lowered from the wing; however, none of them observed either. the actual mating, separating, raising, or lowering of the
Open official document at PDF page 31NTSB AAR-79/17: American Airlines DC-10-10 N110AA, Chicago