The stripped Acme nut sheared at cruise speed - did they land in time?
カートのアイテムが多すぎます
ご購入は五十タイトルがカートに入っている場合のみです。
カートに追加できませんでした。
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ウィッシュリストに追加できませんでした。
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ほしい物リストの削除に失敗しました。
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ポッドキャストのフォローに失敗しました
ポッドキャストのフォロー解除に失敗しました
The stripped Acme nut sheared at cruise speed - did they land in time?
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The stripped Acme nut sheared at cruise speed - did they land in time?
In this episode, we follow the final hours of Alaska Airlines Flight 261 and the chain of maintenance decisions, measurements, and missed warnings that set the stage for an in-flight emergency. The narrative tracks the aircraft, crew actions, and the failing jackscrew assembly while asking whether earlier choices cost crucial minutes.
Aircraft: MD-83 N963AS
Event: In-flight jam of horizontal stabilizer trim system
Date: January 31 (timeframe given in transcript)
Crew: Captain Ted Thompson; First Officer William Tansky; three flight attendants
Maintenance history: Last measured September 1997; last lubrication September 1999
- A steel jackscrew rotated through an aluminum-alloy Acme nut beneath the cockpit floor that translated rotation into stabilizer movement.
- Ninety percent of the nut’s threads were gone when the plane departed, described in the transcript as “not worn, gone.”
- A mechanic had warned supervisors three years earlier about this part on that specific aircraft and was later placed on paid leave.
- Scheduled inspections used nonstandard tools and the last formal measurement missed the true condition; lubrication recorded as a four-hour job was logged as about one hour.
- During the flight the trim system jammed, the captain applied continuous force to the yoke, and the crew debated diverting to Los Angeles versus continuing to San Francisco.
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