A software defect in the Boeing 737 MAX flight management system can cause vertical navigation (VNAV) to revert unexpectedly to simpler automation modes - such as vertical speed or level change - after a missed approach when the pilot changes the programmed flight path. That unexpected mode change forces crews to recognize and manage an automation transition during a high-workload, critical phase of flight; Boeing says pilots are trained to handle it and is developing both a software correction and an interim procedure to restore VNAV.
Boeing first identified the problem in November 2024 and initially judged it didn’t require a safety review, only notifying operators in late August 2026 and prompting a formal review in September that was shared with the FAA. The timing has immediate consequences: the FAA has convened a Corrective Action Review Board and deferred final signoff for the 737 MAX 10, which was believed to be days from certification. Southwest and United have said they will not accept newly delivered MAX aircraft with the current software and will only take jets running the prior software; Boeing targets a permanent fix originally for early 2028 and is attempting to accelerate that schedule.
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