Page:NTSB Report, Japan Air Lines Flight 813.pdf/12

- 9 - of part concrete and part asphalt construction and at the time of landing the surface was dry. No other aerodrome or ground facilities were pertinent to the moment.

1.1.1 Flight Recorders

A flight recorder was not required in the aircraft by the government of Japan; however, a smplified spool type was installed. The only information it provided, vertical acceleration, was not pertinent to this accident.

1.12 Wreckage (Damage)

The major damage sustained by the aircraft was to its No. 1 engine and pylon, and to the left wing from the leading to trailing edges in the area. generally aligned with the No. 1 engine. The principal engine damage was the type associated with a. disintegrating engine failure. The engine pylon enﬁ wing damage was mainly from intense fire although both received shrapnel-like penetrations from flying engine pieces. Flying pieces made two punctures in the fuselage and. as previously noted. one piece of stator vane penetrated the No. 2 engine pylon and ruptured a hydraulic line. Twelve other pieces pierced the No. 2 engine pylon and one or more of these severed the No. 2 engine thrust reverser pneumatic retract line.

Investigation revealed that the No. 1 engine low pressure compressor outer case had. shattered into many nieces and separated from the engine. The forward portions of the engine cowl doors were torn away and the air inlet case had separated from the engine, exposing the low pressure compressor. All stages of the compressor were damaged, with compressor blades bent, torn and broken