FAA Reviews New 737 MAX Software Glitch, Threatening Imminent MAX 10 Certification

For Boeing to finally deliver its largest 737 MAX variant to waiting airlines, the aircraft's flight management software must pass a flawless Federal Aviation Administration review. That condition is now in jeopardy. The FAA has convened a Corrective Action Review Board to investigate a newly disclosed software glitch that can disable automated vertical navigation during aborted landings, a development that threatens to stall the imminent certification of the MAX 10.

The regulatory intervention arrives just as Boeing was reportedly days away from securing approval for the final model in its narrowbody family, adding a fresh layer of scrutiny to a production pipeline that has faced years of delays and intense oversight.[1][3]

The technical anomaly resides specifically within versions 14 and 14.1 of the operating system for the 737 MAX flight management computer. According to regulatory and company documents, the glitch triggers under a highly specific operational sequence during the final stages of a flight.

If a pilot is flying a precision approach with the autopilot engaged, executes a missed approach—commonly known in aviation as a go-around—and subsequently alters the pre-programmed flight path, the software can fail to maintain its intended guidance parameters. This precise combination of inputs exposes a vulnerability in how the aircraft's computers manage altitude and trajectory during a critical phase.[1][2]

Under those exact conditions, the aircraft's vertical navigation system, known as VNAV, can unexpectedly disengage. The aircraft then reverts to a less sophisticated level of automated pitch control, leaving the crew without the pre-planned altitude management they were relying on.

While the autopilot continues to function and manual flight controls remain fully operational, the glitch forces flight crews to take additional manual steps to restore automated guidance. This introduces a sudden spike in pilot workload during a low-altitude, high-stress environment where the crew is already managing a complex aborted landing sequence.[1][2]

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The timeline of the software issue stretches back nearly two years. Boeing first learned of the anomaly from an airline operator in November 2024. After conducting an initial assessment, the manufacturer concluded by February 2025 that the software behavior did not constitute a formal safety issue. However, following additional feedback and pushback from operators who experienced or reviewed the scenario, Boeing reversed course. The company initiated a formal safety review and ultimately notified all 737 MAX operators of the vulnerability in a bulletin issued in late August 2026.[1][3]

In its communications with airlines, Boeing has maintained that the condition does not pose an immediate safety risk, emphasizing that all commercial pilots are rigorously trained to land the aircraft safely without the use of the VNAV system.

"We shared information with operators that reinforced existing pilot procedures for safely handling such cases," Boeing stated in a release, adding that its engineers are actively developing a permanent software update. The company is currently working to accelerate that permanent fix—which was originally slated for deployment in 2028—and plans to issue updated, formalized pilot procedures by November.[1][2]

Despite Boeing's assurances, major United States carriers are already altering their fleet intake plans to avoid the software entirely. Southwest Airlines and United Airlines, two of the largest operators of the 737 MAX, have formally requested that Boeing halt deliveries of any new aircraft equipped with the affected version 14 software.

Instead, the airlines are opting to receive incoming jets loaded with an earlier, unaffected software version. This move allows the carriers to maintain strict cockpit consistency across their fleets and ensures their pilots will not encounter the VNAV vulnerability during line operations.[2][3]

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The regulatory scrutiny arrives at a highly sensitive juncture for Boeing's broader production and delivery pipeline. The FAA stated it is working closely with both the manufacturer and the airlines to assess the scope of the problem, warning explicitly that it "will take immediate action if it identifies a safety concern."

The ongoing probe now risks delaying the final certification of the MAX 10, which airlines have been waiting years to integrate into their networks. Furthermore, the review could stall upcoming deliveries of the MAX 7, which was certified in August with the problematic software update already installed.[1][3]

For the aviation industry, the software review highlights the ongoing tension between advancing cockpit automation and managing pilot workload during edge-case scenarios. As the FAA's Corrective Action Review Board evaluates Boeing's proposed fixes and procedural updates, airlines are left waiting for clarity on when the newest MAX variants will be cleared for unrestricted service. The outcome of the board's investigation will dictate whether Boeing can proceed with its current delivery schedules or if the manufacturer must implement the permanent software patch before the MAX 10 is allowed to carry passengers.[1][3]