Boeing (BA) Stock Rises as 737 MAX VNAV Software Issue Triggers FAA Investigation

Key Takeaways

• A software defect in Boeing’s 737 MAX can deactivate the vertical navigation autopilot feature under certain landing conditions.
• The malfunction occurs following an aborted landing attempt when pilots adjust their approach path, causing the VNAV system to shut off.
• Airlines were informed of the defect in late August, though Boeing initially discovered it in November 2024.
• Both Southwest and United have requested Boeing suspend deliveries of new 737 MAX aircraft containing the problematic software version.
• Federal aviation regulators are examining the matter and will determine whether safety protocols require action.

Shares of Boeing (BA) advanced 0.65% after reports emerged detailing a software malfunction discovered in the company’s 737 MAX aircraft. Meanwhile, Southwest (LUV) surged 2.72% and United (UAL) gained 2.52% during the same trading session.

The Boeing Company, BA

The defect has the potential to shut down an automated navigation feature during the landing phase. The problem surfaces only under particular circumstances.

These circumstances arise when pilots execute a go-around maneuver and subsequently alter their approach trajectory. Under these conditions, the aircraft’s vertical navigation feature, known as VNAV, can unexpectedly shut down.

Flight crews must then revert to manual control without certain autopilot assistance. This situation frequently occurs at reduced altitudes, an already demanding segment of flight operations.

Company’s Disclosure Timeline

Boeing reports that the malfunction came to light in November 2024. An internal assessment conducted in February 2025 concluded the issue didn’t warrant a comprehensive safety evaluation.

However, airline operators voiced apprehensions, prompting Boeing to initiate a formal investigation this month and communicate results to federal regulators.

The aerospace manufacturer informed 737 MAX customers of the defect in late August. Initial communications indicated the problem didn’t constitute a safety threat.

Boeing is currently developing a lasting software correction. Additionally, operational guidance to help flight crews reinstate the automated capability is being prepared.

The solution was initially projected for early 2028. Boeing now indicates it’s working to accelerate the implementation schedule.

Industry and Regulatory Reactions

Both Southwest and United have requested Boeing postpone deliveries of new 737 MAX planes equipped with the flawed software. The carriers prefer earlier software iterations be installed instead.

Multiple other prominent airlines report their existing 737 MAX fleets don’t operate the problematic software version. The total number of affected aircraft globally remains undetermined.

The FAA acknowledged its ongoing investigation. The regulatory body states it’s coordinating extensively with Boeing and affected carriers.

Should the defect be deemed a legitimate safety hazard, a special review panel will be assembled. The FAA hasn’t reached that conclusion at this time.

Boeing maintains that its engineering teams have strengthened current pilot protocols for managing this scenario. The manufacturer also confirms a comprehensive software revision is underway.

This represents another challenge for the troubled 737 MAX program. The aircraft was banned from global operations following two fatal accidents in 2018 and 2019 linked to defective software systems.

Additionally, a 2024 incident involving a door panel detachment on an Alaska Airlines MAX 9 reignited concerns about the plane’s production quality.

The present software issue also complicates regulatory approval timelines. The 737 MAX 10 variant was allegedly nearing FAA certification before this investigation emerged.

That certification timeline is now anticipated to extend. The MAX 7’s market entry may similarly experience postponement due to the delay.

Currently, Boeing emphasizes the correction remains a top priority. The manufacturer hasn’t announced a revised completion date for the definitive software patch.