Accident Summary

Alaska Airlines Flight 261 with 2 pilots, 3 cabin crew, and 83 passengers departed Puerto Vallarta (PVR), Mexico to Seattle, Washington with a scheduled stop in San Francisco, California.

Visual meteorological conditions prevailed for the flight that operated under an instrument flight rules flight plan.

The airplane was functioning normally during the initial phase of flight but the horizontal stabilizer stopped responding to autopilot and pilot commands after the airplane passed through 23,400 feet.

The pilots recognized the longitudinal trim system was not functioning but could not determine why.

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