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Japan Air Lines 123

Printed page label not indexed. PDF page 74.

Yhen L18 splice is broken into two portions, upper and lower, bay 5 connected with a collector ring increase. This indicates a Possibility that the connection of the web and the ring is then ruptured towards a series of succeeding
Open official document at PDF page 74AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 75.

splice was separated into upper and lower parts, the web above its portion connected with collector ring was fractured, and the fracture progressed along R6 stiffener and L2 stiffener. On the other hand, the web above the portion connected with
Open official document at PDF page 75AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 116.

viewed from aft of the aft pressure bulkhead) of L18 splice detoured clockwise along the collector ring located in the center of bulkhead and advanced upward along R6 and L2 stiffener. On the other hand, the fracture which progressed leftward
Open official document at PDF page 116AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page 125. PDF page 136.

fracture propagated thereafter upward in the cental portion of the bulkhead along the collector ring, and furthermore progressed upward along R6 and L2 stiffeners, and meanwhile in the outer edge portion of the bulkhead, the fracture propagated upward along Y
Open official document at PDF page 136AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 260.

aft pressure bulkhead, the work involve. replacement of the lower half Cincluding the collector ring), removal/replacement of APU for inspection, etc. (3) replacement of some parts of the main landing gear (4) hard landing check, fuselage pressure test, and other
Open official document at PDF page 260AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 262.

pressure bulkhead and the collector ring were removed. (3) In the work to attach the new lower half of the aft pressure bulkhead, firstly, the lower half of the bulkhead was attached to the airframe at the Y cho
Open official document at PDF page 262AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119