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Boeing discloses 737 MAX software glitch, FAA review threatens MAX 10 certification date

Boeing disclosed a flight management computer defect that can drop the MAX out of vertical navigation during a go around, and the FAA has convened a review board that could delay MAX 10 certification.

26 September 2026

Boeing said on 26 September 2026 that its 737 MAX flight management computer carries a software defect that can cause the flight guidance system to unexpectedly drop out of vertical navigation, its most automated pitch control mode, into a simpler mode during a go around in which the crew has altered the programmed flight path with the autopilot engaged. Boeing found the issue in November 2024, did not consider it safety significant at the time, and notified operators around a month ago while reinforcing existing go around procedures. It had planned a permanent software fix for 2028.

The FAA said it is assessing the issue and has convened a Corrective Action Review Board, the process used to decide whether a post certification finding requires mandatory action. No Airworthiness Directive has been issued. Multiple reports say major US carriers, including Southwest and United, have told Boeing they will not accept new jets running the affected software version, and that the review could delay certification of the 737 MAX 10, expected this autumn, and complicate the newly certified 737 MAX 7's entry into service. Boeing and the FAA both say the autopilot continues to function without vertical navigation, and pilots are trained to hand fly the vertical path in that mode. Boeing is working to accelerate both the software fix and a fuller pilot bulletin, expected in November.

On the line

No inspection or compliance action applies yet, since no Airworthiness Directive has been issued. Reinforce go around procedure familiarity for MAX crews, and watch for an interim pilot bulletin from Boeing ahead of the accelerated software fix.

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