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FAA Approves Leap-1B Engine Durability Kit

July 19, 2026

2 min read

Key Takeaways

FAA certifies Leap-1B high-pressure turbine durability kit.
Changes aim to address durability shortcomings in 737 Max engines.
CFM to begin delivering updated Leap-1Bs in 2027.
Updates also include a new reverse bleed system for fuel-nozzle longevity.

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Strategic Implications

This approval may indicate a significant improvement in the reliability of Leap-1B engines, which could enhance the overall performance of Boeing's 737 Max fleet. The updates suggest a focus on addressing durability issues, which could benefit CFM and its customers in the long term, and may set a precedent for future engine design and maintenance strategies.

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What Happened

CFM Secures Certification For High-Pressure Turbine Upgrades

The Federal Aviation Administration has certified high-pressure turbine and fuel nozzle durability improvements for CFM International Leap-1B turbofans, which power Boeing’s 737 Max. The changes, aimed at addressing durability shortcomings, are expected to double time-on-wing in harsh environments. CFM, jointly owned by GE Aerospace and Safran, has secured engine- and aircraft-level approvals for the changes, with full production cutover expected in early 2027. This development was first reported by FlightGlobal.

Source | Originally Published: July 18, 2026

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