Page:NTSB Report, Japan Air Lines Flight 813.pdf/18

- 15 - inboard aileron caused by fire damage and. defamation, the captain elected to divert the flight to the Oakland International Airport. At 1320, about nine minutes after the onset of the emergency) he made a. safe landing.

From the physical evidence obtained in the investigation and from crew information it was clearly established that the inflight fire, the absence of cockpit fire warning, the hydraulic problem and all damage were direct results of the disintegrating failure of the No. 1 engine. There was no other malfunction or failure of the aircraft of a causal nature involved.

The force of the engine breakup was shown to have separated the quick disconnect valve in the pylon to engine fuel line and the force so damaged the valve that it remained in the open position. Fuel was thereby released into the engine and ignited. Because the separation was upstream of the engine fuel control,the fuel flow was not stopped by the engine shut-down procedures. Consequently, the fire continued until the cockpit control for the emergency fuel shutoff Valve was actuated in the emergency fire procedure and the valve, located upstream of the quick disconnect, closed, thus stopping the fuel flow. A motion picture being taken of the flight by a. ground witness furnished the evidence which established that the fire went out with this action and before the engine fire extinguisher was discharged. In this regard the movie showed the fire disappear and then the white puff of the extinguisher being discharged.

The fire warning system failed to function because the same disintegrating force tore away the sensor portion of the system. The hydraulic system problem was caused by a piece of stator vane from the No. 1 engine which pierced the No. 2 engine pylon and ruptured a hydraulic line.