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Printed page label not indexed. PDF page 49.
conductivity measurement, combined with the results of the hardness test in item (c) above, it is estimated that normal heat treatment had been given to the structural materials of the aft pressure bulkhead. It is hard to presume that inappropriateOpen official document at PDF page 49AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119
Printed page label not indexed. PDF page 70.
irregular sound ocurred during flight over Sagami Bay is estimated to have been about -1° , it is estimated that the lower seal doors rose to seal the lower openings of the fuselage together with the sliding blade seals asOpen official document at PDF page 70AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119
Printed page label not indexed. PDF page 86.
abnormal situation occurred. When the aircraft weight at that time is taken into account, it is estimated that an external force of as much as about 11 tons acted forward, and that the rupture of the aft fuselage occurred atOpen official document at PDF page 86AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119
Printed page label not indexed. PDF page 87.
slightly, and at 36.28 seconds it jumped by about -0.24 G, causing a disturbance to begin. It is estimated that the vertical fin ruptured nearly at this time. (g) Rudder Pedal Position PED had been in the normal neutral positionOpen official document at PDF page 87AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119
Printed page label not indexed. PDF page 88.
Rupture From wreckage investigation, and analysis of DFDR record and photographic image, it is estimated that the empennage portion aft of BS2658 was separated immediately after-the abnormal situation occurred. llowever, the shape of the vertical fin after it ruptured isOpen official document at PDF page 88AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119
Printed page label not indexed. PDF page 89.
constantin roll subsidence decreases to some extent. When the abnormal situation occurred, it is estimated that the aircraft was flying at a height-speed combination such that the dutch roll mode would become unstable under the assumption of linearization if theOpen official document at PDF page 89AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119