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Japan Air Lines 123

Printed page 6. PDF page 17.

from Oshima) from present position, and the request was approved at 1818:33 hours. At 1824:35 hours just before the aircraft reached 24,000 feet, heading towards Seaperch and approaching east coast of South Izu Peninsula, the aircraft was brought into an
Open official document at PDF page 17AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 73.

comparison of these figures with the estimated cabin differential pressure of 8.66 psi(*) at 1824:35 hours when the abnormal situation occurred, it is conceivable that rupture of the bulkhead started from bay 2. * (Remarks) The cabin differential pressure when
Open official document at PDF page 73AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 76.

in the flight condition immediately before the abnormal Situation occurred at about 1824:35 indicates that a differential pressure not exceeding 0.5 psi at the maximum is applied to the skin of the aft torque box from inside to outside. It
Open official document at PDF page 76AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 85.

could be lessened. However, the error mark still remained at three portions, i.e. about 1824:35, about 1840:34, and a portion of more than one minute after 1855:12, which needed data recovery by the method in (3) below. (3) Error Correction
Open official document at PDF page 85AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 86.

abnormal situation: (a) Longitudinal Acceleration (LNGG) The longitudinal acceleration at 1824:35.70 shows a spike of about 0.047 G as compared to those before and after the abnormal situation occurred. When the aircraft weight at that time is taken into account,
Open official document at PDF page 86AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 87.

Vertical acceleration that is indicative of normal flight conditions are recorded up to 1824:35.66. Thereafter to 31.16 seconds the vertical acceleration increased slightly, and at 36.28 seconds it jumped by about -0.24 G, causing a disturbance to begin. It is
Open official document at PDF page 87AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119