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Printed page label not indexed. PDF page 6.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 1.16.2.4 Lower MechanicalOpen official document at PDF page 6Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000
Printed page 17. PDF page 31.
indicators for the longitudinal control system. The jackscrew assembly also has upper and lower mechanical stops splined to the acme screw to stop screw rotation if the travel limit shutoff switches malfunction. The mechanical stops rotate with the acme screwOpen official document at PDF page 31Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000
Printed page 18. PDF page 32.
indicated that the maximum possible horizontal stabilizer position when the acme screw lower mechanical stop is pulling up on, but is restrained by, the acme nut is about 3.1ยบ airplane nose down.Open official document at PDF page 32Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000
Printed page 61. PDF page 75.
to the splines of the acme screw, and the clamp bolt for this stop was in place. The lower mechanical stop and its clamp bolt were recovered as a separate unit from the acme screw. Several impact/scrape marks were foundOpen official document at PDF page 75Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000
Printed page 67. PDF page 81.
1.16.2.1 Horizontal Stabilizer Forward Spar The jackscrew assembly (not including the lower mechanical stop, the lower end of the torque tube, the torque tube retaining nut and washer, and the trim motors) was recovered attached to the front of theOpen official document at PDF page 81Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000
Printed page 71. PDF page 85.
torque tube at the location corresponding to the upper end of the acme screw. 1.16.2.4 Lower Mechanical Stop and Corresponding Spline Area on the Acme Screw The lower mechanical stop of the acme screw assembly was recovered with a sectionOpen official document at PDF page 85Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000