Re: 華航22年前一起空安事故的疑問
※ 引述《EMU108.bbs@neiwan.twbbs.org (天下"圍攻"!!!)》之銘言：
: 最近無意間在國外網站找到華航在1985年年初一起空中事故的報導:
: 找了一下相關訊息,
: 這起事故發生於1985年二月十九日,
: 地點在美國加州外海41,000呎高空,
: 疑似遇到亂流導致四號引擎失效,
: 當機員試圖重新啟動四號引擎時,
: 飛機在150秒內從41,000英呎急下降至9,500呎處,
: 最後飛機於舊金山(該機原定往洛杉磯)迫降成功,
: 兩人重傷,
: 飛機的水平尾翼也被發現有受損現象
: 想請問各位先進:
: 這起事故的真正原因及其經過是什麼???
: 同時請問,
: 這架747SP是不是於事故期間突破了音速???
: 謝謝!
: 另外,
: 這起事故已被拍攝成紀錄片,
: "空中浩劫"第四季的第七集,
: 美加地區預定今年夏天播出,
: 台灣地區播出時間未定
內灣是看不到推文的：
調查報告下載 http://www.airdisaster.com/reports/ntsb/AAR86-03.pdf
4314篇貼過調查報告的3.1 & 3.2，再貼一次
3.1 Finding
1. The flightcrew was properly certificated and qualified.
2. The Changing airspeeds encountered by Flight 006 and the resultant
compensating throttle adjustments were caused by wind speed variations.
3. The No.4 engine did not flame out, but "hung" at about 1.0 EPR.
4. During his attempt to recover the No.4 engine, the flight engineer did
not close the bleed air valve switch before advancing the No. 4 throttle.
5. The other three engines did not lose thrust nor did they flame out.
6. The captain did not disengage the autopilot in a timely manner after
thrust was lost on the No.4 engine. The autopilot effectively masked
the approaching onset of the loss of the airplane.
7. The captain was distracted from his flight monitoring duties by his
participation with the flight engineer in the evaluation of the No.4
engine's malfunction.
8. With the exception of the loss of thrust on the No.4 engine, no other
airplane malfunction affcted the performance of the airplane; the loss
of thrust on the No.4 engine did not contribute to the accident.
9. The captain was also distracted by his attempts to arrest the airplane's
decreasing airspeed, and this also contributed to his failure to detect the
airplane's increasing bank angle.
10. The lateral control deflections required to maintain level flight under
conditions of thrust asymmetry and decreasing airspeed exceeded the
limits of the autopilot's lateral control authority, causing the airplane
to roll and yaw to the right. The captain lost control of the airplane
when, after disengaging the autopilot, he failed to make the proper flight
control corrections to recover the airplane.
11. The damage to the airplane was a result of the acceleration forces and
high airspeeds that occured during the upset and recovery maneuvers.
p.34:
3.2 Probable Cause
The National Transportation Safety Board determines that the probable cause
of this accident was the captain's preoccupation with an inflight malfunction
and his failure to monitor properly the airplane's flight instruments which
resulted in his losing control of the airplane.
Contributing to the accident was the captain's over-reliance on the autopilot
after the loss of thrust on the No.4 engine.
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◆ From: 71.237.67.217
※ 編輯: kaichun1216 來自: 71.237.67.217 (04/25 23:45)
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