Page:NTSB Report, Japan Air Lines Flight 813.pdf/13

- 10 - in the direction opposite to rotation. All stages of stator vanes were dislodged from the compressor.

The starter, generator, and constant speed drive of the engine were broken from the lower accessory gear box. The oil tank was separated from its mount and punctured by flying engine pieces.

Through a search of the Brisbane—South San Francisco area where parts from the aircraft were reported to have fallen, about 100 pieces from the No. 1 engine were recovered. One piece, 30 inches by 8 inches with a 40—inch strip attached, was segment of the low compressor outer case from the rear of the compressor case "0" flange at the No. It stage stator position. The strip and forward edge of the piece showed frictional heat discoloration. The strip also exhibited extensive circumferential scoring on its inside diameter in the area. out the fourth stage stator outer shroud.

Among the recovered pieces there were two other segments of the low compressor case "C" flange, one 75 inches long and the other 12 inches long. Both pieces shoved frictional heat discoloration at the rear area of the flange, and in the same area the flange was separated circumferentially from the compressor case. Along the line of separation the metal was molten in appearance. In portions of this area there were a number of rust holes for the purpose of riveting the torque ring in place. On the forward side of the pieces of "C" flange small pieces of compressor case were still attached and the fracture side or the pieces evidenced tearing type separation.

The rear flange or the compressor case remained attached to the intermediate case and a piece of low compressor case 35 inches by 18 inches was