What the 737 MAX Software Flaw Does—and What the FAA Review Means

A software issue on some Boeing 737 MAX aircraft can interrupt automated flight guidance during a particular missed-approach sequence. Boeing told operators about the issue in August 2026, and it became public on September 26 through reporting based on company documents. The available sources do not establish when Boeing first found the flaw or exactly how it was detected. 1217

When does the software issue occur?

The reported trigger involves a go-around—a decision to abandon an approach and try again—followed by a change to the aircraft’s preprogrammed flight path. In a specific sequence, the flight management computer can cause vertical navigation, or VNAV, to disengage. Reports describe a possible loss of automated vertical guidance and, in some circumstances, some autopilot functions becoming unavailable. 101315

That is not the same as a complete loss of aircraft control. Boeing said pilots may not have access to automated flight guidance in the scenario; reporting on the issue describes crews using manual control or other available modes. 2611

What did Boeing tell airlines, and when?

Boeing said it informed all 737 operators “last month”—August 2026—about the issue and shared information reinforcing existing pilot procedures. The flaw was reported publicly on September 26, with coverage citing company documents. Those reports do not provide a confirmed date for Boeing’s initial discovery or a detailed account of how it identified the software behavior. 1217

Boeing says engineers are working on a software update to address the problem permanently. The available sources do not give a completion date. 2

What does it mean for pilots and airlines?

The issue could add workload during a demanding phase of flight because crews may need to manage the approach without the affected automated guidance. Boeing’s operator communication reinforced existing procedures, while the FAA is reviewing the issue and the proposed fix. 26

This is a specific reported software scenario, not evidence by itself of an accident or a demonstrated loss of control. The available reporting does not establish how often the sequence occurs or quantify its operational impact. 1613

What is the FAA reviewing—and what happens next?

The FAA says it is assessing the problem and Boeing’s proposed fix, and that it will take immediate action if it identifies a safety concern. 6 On September 28, the agency’s administrator said the FAA would not certify the 737 MAX 10 until it had assessed the software issue, making a certification delay an announced consequence of the review—not merely a possibility.

The MAX 7 is a separate case: the FAA certified it on August 3, 2026. Sources say the software issue has put its entry into service and deliveries under scrutiny, but the available information does not establish a resulting delay to either. 314

The key unresolved questions are whether the FAA considers the issue a safety concern, whether it accepts Boeing’s proposed fix, and when that update will be ready. Until those questions are answered, the operational and schedule effects beyond the MAX 10 certification delay remain uncertain. 6