In-flight pitch control anomaly on a scheduled international passenger flight (N4719U)

Incident Overview During level flight at flight level 290, while operating a scheduled international passenger flight from San Francisco, California, to London, England, elevator pitch control became erratic. The aircraft experienced oscillations of up to 1,000 feet either side of the base altitude. ## Crew Actions The autopilot was disconnected, and communications were maintained with maintenance control. The flight then proceeded to the nearest airport with runways exceeding 10,000 feet in length. ## Outcome An uneventful precautionary landing was conducted in Denver, Colorado. ## Investigation Findings Examination of stabilizer trim components revealed discrepancies in the trim module and elevator feel computer, which were attributed to normal wear.