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FAA issues emergency AD regarding potential erroneous AOA input on Boeing 737 MAX
7 November 2018

On November 7, the U.S. FAA issued an emergency Airworthiness Directive (AD 2018-23-51) regarding the potential for erroneous angle of attack input.

The AD, and an earlier Boeing FCOM Bulletin on the matter, was prompted by initial findings in the investigation into the cause of the crash of Lion Air flight JT610 on October 29, 2018. The Indonesian NTSC revealed that the aircraft experienced erroneous input from one of its AOA (Angle of Attack) sensors.

The FAA AD now requires “revising certificate limitations and operating procedures of the airplane flight manual (AFM) to provide the flight crew with runaway horizontal stabilizer trim procedures to follow under certain conditions.”

On November 6, 2018, Boeing issued an Operations Manual Bulletin (OMB) directing operators to existing flight crew procedures to address circumstances where there is erroneous input from an AOA sensor. (Boeing statement)