Why U.S. airlines balked at adopting Boeing’s latest 737 Max software versions

Key Points:

• U.S. airlines have avoided installing the latest Boeing 737 Max flight management software (versions U14 and U14.1) due to multiple glitches, preferring to use the older U13 version despite its own minor issues.
• The FAA recently reviewed a vertical navigation (VNAV) bug found during missed landing approaches and concluded it does not pose a safety risk, allowing certification of the 737 Max 10 and delivery of the Max 7 to proceed.
• The U14 software introduced several problems, including crew distractions and datalink communication failures, which contributed to incidents like a 2022 wrong-runway landing by United Airlines, prompting airlines to downgrade or avoid updates.
• Hardware updates to protect against solar radiation have complicated software rollbacks, as newer flight management computers (C2 configuration) are incompatible with the older U13 software, limiting airlines’ flexibility.
• Boeing and GE Aerospace continue to work on software improvements, with the FAA increasing oversight, but airlines remain cautious due to the complex technical challenges and operational risks associated with the 737 Max’s flight management system.