LEAP-1B

The LEAP-1B is a high-bypass turbofan engine produced by CFM International, the long-standing joint venture between GE Aerospace of the United States and Safran Aircraft Engines (Safran S.A.) of France. It represents the successor to the CFM56-7B, incorporating carbon-fibre composite fan blades and Additive Manufacturing (3D-printed) fuel nozzles. This specific model is the exclusive powerplant for the Boeing 737 MAX family, featuring a smaller fan diameter than its sister variants to accommodate the lower ground clearance of the 737 airframe. Procurement is handled through direct sales to airlines and leasing firms, typically bundled with long-term Rate-Per-Flight-Hour (RPFH) service agreements. Major global operators include Southwest Airlines, United Airlines, Ryanair, and Lion Air. The engine is a corner-stone of the narrow-body commercial market, designed to offer a significant double-digit reduction in fuel consumption and CO2 emissions compared to previous generation single-aisle aircraft engines. Buyers must monitor the technical health of the fleet following historical issues related to high-pressure turbine durability and carbon buildup in fuel nozzles. The Aerospace Garage desk would verify the specific hardware standards (Mod Status) of any second-hand unit, as earlier production batches have undergone multiple service bulletin updates. Prospective owners should also confirm the current status of the manufacturer's supply chain, which has previously impacted the delivery schedule of new-build shipsets.