Boeing has issued a bulletin to operators related to its B737 MAX as the investigation continues into the crash of Lion Air flight JT610.

The US aircraft manufacturer is providing support and technical assistance to the Indonesian National Transportation Safety Committee (INTSC) and other government authorities responsible for the investigation. The INTSC has indicated that the aircraft experienced erroneous input from one of its Angle of Attack (AOA) sensors.

Boeing stated: “Whenever appropriate, Boeing, as part of its usual processes, issues bulletins or makes recommendations regarding the operation of its aircraft. 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.

“The investigation into Lion Air flight 610 is ongoing and Boeing continues to co-operate fully and provide technical assistance at the request and under the direction of government authorities investigating the accident.”

The US Federal Aviation Administration (FAA) also stated: “Boeing has released a Flight Crew Operations Manual Bulletin regarding the potential for erroneous angle of attack input on 737 MAX aircraft. The FAA plans to mandate the Flight Crew Operations Manual Bulletin by issuing an Airworthiness Directive.

“The FAA continues to work closely with Boeing, and as a part of the investigative team on the Indonesia Lion Air accident, will take further appropriate actions depending on the results of the investigation. The FAA has alerted affected domestic carriers and foreign airworthiness authorities who oversee air carriers that use the 737 MAX of the agency’s forthcoming action.”

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