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Printed page label not indexed. PDF page 14.
Also contributing to the accident was the absence on the McDonnell Douglas MD-80 of a fail-safe mechanism to prevent the catastrophic effects of total acme nut thread loss. The safety issues discussed in this report include lubrication and inspection ofOpen official document at PDF page 14Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000
Printed page 156. PDF page 170.
717 fleet. Therefore, the Safety Board believes that, pending the incorporation of a fail-safe mechanism in the design of the DC-9, MD-80/90, and 717 horizontal stabilizer jackscrew assembly, as recommended in Safety Recommendation A-02-49 in this report, the FAA shouldOpen official document at PDF page 170Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000
Printed page 165. PDF page 179.
Analysis 165 Aircraft Accident Report further concludes that the absence of a fail-safe mechanism to prevent the catastrophic effects of total acme nut thread loss contributed to the Alaska Airlines flight 261 accident. 2.6.2 Prevention of Acme Nut Thread LossOpen official document at PDF page 179Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000
Printed page 166. PDF page 180.
assembly in DC-9, MD-80/90, and 717 series airplanes and require, if practicable, that such fail-safe mechanisms be incorporated in the design of all existing and future DC-9, MD-80/90, and 717 series airplanes and their derivatives; (2) evaluate the horizontal stabilizerOpen official document at PDF page 180Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000
Printed page 179. PDF page 193.
of the acme nut threads as a catastrophic single-point failure mode. The absence of a fail-safe mechanism to prevent the catastrophic effects of total acme nut thread loss contributed to the Alaska Airlines flight 261 accident.Open official document at PDF page 193Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000
Printed page 180. PDF page 194.
Also contributing to the accident was the absence on the McDonnell Douglas MD-80 of a fail-safe mechanism to prevent the catastrophic effects of total acme nut thread loss.Open official document at PDF page 194Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000