Investigation launched: Boeing discovers bug in 737 MAX model - and airlines are already refusing

Boeing has discovered a bug in the 737 MAX software that could disable some autopilot functions in a missed approach scenario. The FAA has opened an investigation, and Southwest and United are refusing to accept new aircraft with the faulty software until it is replaced.

Boeing has discovered a bug in the 737 MAX software that could disable some autopilot functions in a 'missed approach' landing scenario. In such a case, pilots may be required to fly the aircraft manually without automated assistance, potentially overloading them at low altitude and in adverse weather conditions. According to an internal document obtained by the Wall Street Journal, Boeing informed operators of the issue in late August but reassured them it does not pose a safety risk. The company is expected to release a final software fix in early 2028. Despite the reassurance, Southwest and United have announced they are refusing to accept new aircraft with the faulty software and are demanding an older version. The FAA has opened an investigation, and a senior official at the agency noted that its findings could impact the certification of the new MAX 10 model. The issue also puts Southwest in a bind, as it has been awaiting the MAX 7 model. For Boeing, the stakes are particularly high: the 737 MAX is its best-selling aircraft, but it carries a grim safety history following two fatal crashes in 2018 and 2019 that killed 346 people, leading to a prolonged grounding and a loss of public trust.