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NTSB Demands Urgent Software Update for CFM LEAP-1B Engines on 737 Max and A320neo

FAA will require operators to install a Boeing–CFM fix once certified to prevent oil smoke from entering cabins and cockpits.

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Overview

  • The NTSB has urged the FAA to alert crews on Boeing 737 Max and Airbus A320neo jets powered by CFM LEAP-1B engines about a risk of oil smoke entering the cockpit or cabin after load reduction device activation.
  • Two bird-strike incidents on Southwest Airlines flights in March and December 2023 filled the cabin and cockpit with acrid smoke, highlighting a flaw in the engines’ safety mechanism.
  • Investigators found that the load reduction device can damage the engine oil system and allow hot oil fumes to seep into aircraft ventilation ducts.
  • Boeing and CFM International are collaborating on a software modification designed to automatically limit smoke release, and the FAA has agreed to mandate its installation once certified.
  • The NTSB also recommended regulators review LEAP-1A and LEAP-1C engines and major carriers like IndiGo, Air India, Akasa Air, and SpiceJet are preparing to adopt the upcoming updates.