Due to ongoing Lion Air Flight 610 crash investigation, Boeing - the manufacturer of the crashed 737 MAX 8 aircraft - has issued a bulletin, warning MAX aircraft operators about erroneous Angle of Attack (AOA) sensors input and safety procedures in this case.

The ongoing investigation, lead by the Indonesian National Transportation Safety Committee,  has suggested that the Flight JT610 plane experienced erroneous input from one of its AOA (Angle of Attack) sensors and had them changed a day before the crash. Malfunction of these sensors can lead to aircraft entering aerodynamic stall.

In response, Boeing issued a bulletin to airlines, directing them to follow “existing flight crew procedures to address circumstances where there is erroneous input from an AOA sensor”, according to a statement by the manufacturer.

The bulletin was already addressed by the Federal Aviation Administration of the United States (FAA), which is preparing to issue an airworthiness directive, mandating airlines to follow the bulletin. The authority has reportedly also notified regulatory agencies in other countries on its decision. As the Lion Air crash investigation moves forward, FAA intends to "take further appropriate actions depending on the results of the investigation".

Boeing claims it is a standard procedure to issue operations manuals “whenever appropriate” and points out that it is participating in the investigation “providing support and technical assistance”, under [Indonesian] government authorities direction.