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| Name | Japan Airlines Flight 123 Accident (12 Aug 1985) - Cockpit Voice Recorder [English Subbed] |
| Video Uploader | Video From KayEigh |
| Upload Date | This Video Uploaded At 05-06-2009 02:55:47 |
| Video Discription | Japan Airlines Flight 123 was a Japan Airlines domestic flight from Tokyo International Airport (Haneda) to Osaka International Airport (Itami). The Boeing 747-SR46 that made this route, registered JA8119, suffered mechanical failures 12 minutes into flight and 32 minutes later crashed into two ridges of Mount Takamagahara in Ueno, Gunma Prefecture, 100 kilometers from Tokyo, on Monday 12 August 1985. The crash site was on Osutaka Ridge (おすたかのおね, Osutaka-no-One), near Mount Osutaka. All 15 crew members and 505 out of 509 passengers died, resulting in a total of 520 deaths and 4 survivors. It remains the deadliest single-aircraft accident in history. The official cause of the crash according to the report published by Japan's then Aircraft Accidents Investigation Commission is as follows: 1. The aircraft was involved in a tailstrike incident at Osaka International Airport on 2 June 1978, which damaged the aircraft's rear pressure bulkhead. 2. The subsequent repair of the bulkhead did not conform to Boeing's approved repair methods. Their procedure calls for one continuous doubler plate with three rows of rivets to reinforce the damaged bulkhead, but the Boeing technicians fixing the aircraft used two separate doubler plates, one with two rows of rivets and one with only one row. This reduced the part's resistance to metal fatigue by 70%. According to the FAA, the one "doubler plate" which was specified for the job (the FAA calls it a "splice plate" - essentially a patch) was cut into two pieces parallel to the stress crack it was intended to reinforce, "to make it fit". This negated the effectiveness of two of the rows of rivets. During the investigation Boeing calculated that this incorrect installation would fail after approximately 10,000 pressurizations; the aircraft accomplished 12,319 take-offs between the installation of the new plate and the final accident. 3. When the bulkhead gave way, the resulting explosive decompression ruptured the lines of all four hydraulic systems. With the aircraft's control surfaces disabled, the aircraft became uncontrollable. This is the CVR (Cockpit Voice Recorder) recorded while the accident was happening. 日本航空123便墜落事故（にほんこうくう123びんついらくじこ）は、1985年8月12日午後6時56分、日本航空（当時）123便、東京（羽田）発大阪（伊丹）行、ボーイング747SR-46（「ジャンボジェット」、機体記号JA8119）が群馬県多野郡上野村の高天原山に墜落した事故である。事故調査は、「同機がしりもち着陸事故を起こした後のボーイング社の修理が不適切だったことによる圧力隔壁の破損が原因」とする航空事故調査報告書が1987年6月19日に公表され終了している。運輸省航空事故調査委員会による事故調査報告書によると、死亡者数は乗員乗客524名のうち520名、生存者は4名であった。死者数は日本国内で発生した航空機事故では最多であり、単独機の航空事故では世界最多である。航空事故調査委員会が結論付けた事故原因の要点は以下の通りである。 1. 1978年6月2日に伊丹空港で同機がしりもち事故を起こした。 2. その後のボーイング社による修理が不適切であったため、 飛行の度に客室へ与圧を繰り返す内に圧力隔壁に金属疲労が蓄積した。 3. 金属疲労が限界を超えたため、飛行中に圧力隔壁の破壊が発生した。 4. 圧力隔壁から漏れ出した空気が後部の空洞を伝って垂直尾翼を破壊し、 航空機後部の4系統ある油圧操縦システムの全てが失われて操縦不能に陥った。 5. 油圧の無い状況でフラップを出しすぎたため、急激なダイブに陥り墜落した。 この動画は事故当時にコックピット内で録音されたCVR (Cockpit Voice Recorder)による音声記録です。 |
| Category | News & Politics |
| Tags | JAL | Airplane | Aircraft | Accident | Crash | CVR | Cockpit | Voice | Recorder | 日航機 | 墜落 | 事故 | 123便 | 音声 | ボイスレコーダー |
