Page:NTSB Report, Japan Air Lines Flight 813.pdf/20

- 17 - the areas of extreme abrasion and heat damage because the parts subjected to the damage were fabricated from the same material. Finally, it is not unusual that none of the torque ring was recovered, Since by the time it had ground through the compressor case there would have been little of it renaming.

2.2 Conclusions

(a) Findigs:

1. The flight crew was properly certificated and qualified for the flight operation.

2. Preparations for the flight were routine and it was dispatched in accordance with regulatory and company requirements.

3. About three minutes after takeoff a disintegrating engine failure occurred, followed by an inflight fire and partial hydraulic failure;

4. Emergency procedures for engine failure, engine fire and hydraulic failure were executed quickly and efficiently.

5. When the emergency fuel shutoff valve was closed during the emergency fire procedure the fire went out.

6. The captain diverted the flight to the Oakland International Airport. and made a safe landing.

7. Cabin emergency landing procedures were complete and efficient, as were airport aircraft emergency ground procedures.

8. The engine failure was the result of the low pressure compressor torque ring not being secured in place by riveting during engine overhaul.