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Alaska Airlines 261

Printed page 9. PDF page 23.

to the sound of slat/flap movement. At 1619:36.6, the CVR recorded the sound of an “extremely loud noise” and the sound of background noise increasing, which continued until the end of the recording. At the same time, the CVR also
Open official document at PDF page 23Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000

Alaska Airlines 261

Printed page 65. PDF page 79.

elevator value was -11°, and the load factor was 1 G. At 1619:36.6, the CVR recorded an extremely loud noise, and the FDR recorded a right elevator position of -25°.125 By 1619:36.6, the load factor had increased to 1.45 Gs.
Open official document at PDF page 79Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000

Alaska Airlines 261

Printed page 66. PDF page 80.

was disengaged, and the second and final dive (about 1619:37), which occurred after an extremely loud noise was recorded by the CVR. Results of simulation and kinematics studies indicated that, before the autopilot was disengaged, the values recorded for the
Open official document at PDF page 80Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000

Alaska Airlines 261

Printed page 134. PDF page 148.

flaps were transitioning from 7º to 11º. At 1619:36.6, the CVR recorded the sound of an “extremely loud noise.” Immediately thereafter, the airplane began its final dive. At the time of this pitchover, radar detected several small primary returns, consistent
Open official document at PDF page 148Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000

Alaska Airlines 261

Printed page 135. PDF page 149.

3.6º airplane-nose-down position it was being held at by the brackets. Therefore, the extremely loud noise recorded on the CVR at 1619:36.6 was likely made as the fairing brackets failed and caused the loss of the tip fairing and structural
Open official document at PDF page 149Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000

Alaska Airlines 261

Printed page 232. PDF page 246.

slat/flap handle movement] Aircraft Accident Report 1619:36 CAM-? * 1619:36.6 CAM [sound of extremely loud noise] [increase in background noise begins and continues to end of recording] [sound similar to loose articles moving around in cockpit] 1619:37 CAM-? *
Open official document at PDF page 246Loss of Control and Impact with Pacific Ocean, Alaska Airlines Flight 261, McDonnell Douglas MD-83, N963AS, January 31, 2000