FAA Investigating Boeing 737 Max Glitch That Could Impact Newer Models

Software issue affecting aircraft could inadvertently disengage VNAV capability.

Jack Daleo

Monday, September 28, 2026 at 01:30 PM ET

Verified

Edited By:

Travis Tingle

The 737-10 is the largest member of Boeing's 737 MAX family. [Credit: Boeing]

Key Takeaways:

The FAA is investigating a software glitch in the Boeing 737 Max's flight management computer that could incorrectly disengage its vertical navigation (VNAV) system during certain landing scenarios, potentially requiring more manual pilot intervention.
The glitch stems from a recent software update and affects the Max 7 and Max 10, leading some airlines (e.g., United, Southwest) to refuse deliveries of new aircraft equipped with the updated software, despite Boeing asserting it poses no safety concern.
Boeing is working on a permanent software fix and interim pilot procedures, but the issue could further delay deliveries of the already certified Max 7 and the certification of the Max 10, adding to the 737 Max family's history of safety scrutiny.

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The FAA is investigating whether a glitch stemming from a software update to the flight management computer (FMC) on Boeing 737 Max aircraft poses a safety concern for pilots, as the manufacturer works to resolve the potential issue.

The glitch, which according to Aviation Week could incorrectly disengage the 737 Max’s vertical navigation system (VNAV) and transition to simpler automated guidance during certain landing scenarios, was first reported Saturday by the Wall Street Journal. Per the report, Boeing was first made aware of it in 2024 and in September convened a formal safety review board, which has shared its findings with the FAA. The glitch had not been disclosed publicly.