ASN Wikibase Occurrence # 357947
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| Date: | Wednesday 6 December 1995 |
| Time: | 22:50 LT |
| Type: |  Boeing 747-240BM |
| Owner/operator: | PIA-Pakistan International Airline |
| Registration: | AP-BAK |
| MSN: | 21825/383 |
| Engine model: | GE CF6-50E2 |
| Fatalities: | Fatalities: 0 / Occupants: 255 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | New York-John F. Kennedy International Airport, NY (JFK) -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Unknown |
| Departure airport: | (KJFK) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
After takeoff, about 1,000 ft agl, the crew of the Boeing 747-240 heard a 'thudding noise,' followed by a loss of power in the number two engine. An engine shut down was completed, and an uneventful landing was made at the departure airport. The airplane was equipped with General Electric CF6-50E2 engines. Examination revealed that the low pressure turbine module, which included a portion of the fan mid shaft (FMS) and turbine rear frame, was missing. The airplane sustained damage to the left wing leading and tailing edge flaps, the left main wing landing gear doors, and the number one engine. Examination of the number two engine revealed a fracture face on the forward end of the FMS that showed multiple fatigue origins and circumferential cracks. There were also areas on the FMS that were heat affected. The FMS had previously been installed in a CF6-50 engine that had sustained a failure of the number 3 bearing inner race. The engine had been inspected by company personnel, and records did not reflect that they inspected the FMS for heat affected material. Fatigue cracks located in the heat-affected areas were found to have Sermetel paint and debris in the cracks.
Probable Cause: failure of the number two engine fan mid shaft, due a fatigue fracture caused by a previous bearing failure, and failure of the operator's maintenance personnel to detect the cracks during subsequent inspections.
Accident investigation:
 |
|
Sources:
NTSB NYC96IA036
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 08:21 | ASN Update Bot | Added |
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