What is the difference between LEAP-1A and 1B engines?
Fan Diameter: The LEAP-1B has a smaller fan diameter (69. LEAP-1A (78 inches), reflecting its application on the narrower 737 MAX. Specific Design Features: Bypass Ratio: The LEAP-1A and LEAP-1C (for COMAC C919) have a bypass ratio of 11:1, while the LEAP-1B has a bypass ratio of 9:1. The CFM LEAP engine comes in 3 variants (1A, 1B, 1C). The larger LEAP-1A and LEAP-1C variants have bypass ratios of 11:1, while the smaller LEAP-1B only has a bypass ratio of 9:1.Fan Diameter: The LEAP-1B has a smaller fan diameter (69. LEAP-1A (78 inches), reflecting its application on the narrower 737 MAX. Specific Design Features: Bypass Ratio: The LEAP-1A and LEAP-1C (for COMAC C919) have a bypass ratio of 11:1, while the LEAP-1B has a bypass ratio of 9:1.