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Japan Air Lines 123

Printed page label not indexed. PDF page 8.

(left side) “ (right side) Pressure relief door latch mechanism ; Rupture of BS2658 APU firewall installtion parts between SIL and SIR Hinge support channel of APU air intake duct Damage of APU firewall installation section at BS2658 near S14AR
Open official document at PDF page 8AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 80.

8.1.3 Study on Structural Strength in the Vicinity of APU Firewall (Reference Material - Addendum 3) In order to study how structures in the vicinity of the APU firewall may be damaged in case the air in the cabin flows
Open official document at PDF page 80AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 81.

Figure--14 Qutline of APU Firewall! Structure - side beaa(7 ea) -_ suport struts _ (ea) Irame (rounded) -_" =~ Jable-7_Fstimated Strength of Structural Parts of APU Firewall! (in‘psi) Calculation In case aJ]
Open official document at PDF page 81AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 82.

opening in the aft pressure bulkhead, and release pressure of the vertical fin and the APU firewall. (As to the release pressure, the calculation was carried out for a range of +30% of 4.75 psi and 4.00 psi for the
Open official document at PDF page 82AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page label not indexed. PDF page 83.

seconds compared with the figures above, both in the time the release pressure of the APU firewall is reached and the time the release pressure of the vertical fin is reached. 3.1.4.3 A study was also made on possible cases
Open official document at PDF page 83AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119

Japan Air Lines 123

Printed page 73. PDF page 84.

the APU firewall are disregarded and either reflection of the shock wave or stagnation of the jet stream are taken into account. The study result indicated that in the two cases the average
Open official document at PDF page 84AAIC final report: Japan Air Lines Boeing 747SR-100 JA8119