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Accident Report Detail

Air France, Boeing 747-128, F-BPUD

Executive Summary

Air France Flight 030, a Boeing 747-128, F-BPVD, was a scheduled passenger flight which originated at Chicago's 0'Hare International Airport at 1820 e.d.t., on August 17, 1970. Its destination was Orly Airport, Paris, France, with an intermediate scheduled stop at Montreal, P.Q., Canada. At departure from Montreal, 174 revenue passengers, two infants, and a crew of 17 were aboard the flight.

The flight from Chicago to Montreal was nomal in every respect. The takeoff from Montreal at 2226 was routine; however, approximately 9 minutes after takeoff, at 2235 at an altitude of 5,600 feet m.s.l., a separation of the second-stage turbine disk rim of the No. 3 engine occurred,and pieces penetrated and ruptured the high-pressure turbine case and associated engine cowling . The separation of the turbine disk rim resulted in a localized fire in the upper forward portions of No. 3 engine.

A fire warning, which came on simultaneously with the turbine failure, terminated after both containers of fire extinguishing agent were discharged. The No. 3 engine was shut down and the flight diverted to John F. Kennedy International Airport, Nev York, where it landed safely at 0004 (August 18). There were no injuries to passengers, crew, or persons on the ground.

Probable Cause

The Board determines that the probable cause of this incident was the in-flight separation of the second-stage turbine disk rim of the No. 3 engine. The separation of the disk rim was the result of incorrect assembly of the high-pressure turbine module.

Accident Location: St. Jean , QC Canada  
Accident Date: 8/17/1970
Accident ID: DCA71IZ001

Date Adopted: 10/7/1970
NTSB Number: AAR-70-26
NTIS Number: PB-194753

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