Final rule · 2026-13979

Airworthiness Directives; CFM International, S.A. Engines

The FAA is superseding Airworthiness Directive (AD) 2025-21- 03, which applied to certain CFM International, S.A. (CFM) Model LEAP- 1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-1A35A engines. AD 2025-21-03 required initial and repetitive borescope inspections (BSIs) of the high-pressure turbine (HPT) rotor stage 1 blades. Depending on the results of the BSIs, AD 2025-21-03 required either additional BSIs at reduced intervals or replacement of the HPT rotor stage 1 blades. Since the FAA issued AD 2025-21-03, the manufacturer published updated service material and determined that engines operating in the South Asia region are susceptible to accelerated HPT rotor stage 1 blade deterioration and airfoil distress. This AD requires initial and repetitive BSIs of the HPT rotor stage 1 blades and, depending on the results of the inspections, additional BSIs at reduced intervals or replacement of the HPT rotor stage 1 blades. The FAA is issuing this AD to address the unsafe condition on these products.