The flight's departure from the gate was routine with the exception of some difficulties in starting with No. 1 engine. The airplane was cleared for takeoff from San Francisco's International Airport, Runway 1-R, at 0851. During the takeoff, it was necessary for the flight engineer to reduce power on the No. 1 engine by .10 EPR in order to maintain the EGT within limits. Approximately 16 seconds after lift-off at an altitude of 525 feet m.s.1., the No. 1 engine sustained a separation of the second-stage turbine disk rim. The turbine blades and rim fragments penetrated the high-pressure turbine (HPT) case, engine cowling, and adjacent airplane structure. All fluid lines, electrical cables, and pneumatic ducts located in the pylon area were severed and an intense fire ensued. Two fuel tank access plates on the bottom of the wing inboard of No. 1 pylon were also penetrated by turbine fragments. The National Transportation Safety Board determines that the probable cause of this incident was a progressive failure in the high-pressure turbine module in the No. 1 JT9D-3A engine. (Author)


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    Title :

    Aircraft Incident Report: American Airlines, Inc., Boeing 747-121, N743PA, San Francisco, California, September 18, 1970


    Publication date :

    1971


    Size :

    34 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English