airworthiness · Rule · Final rule. · Published 2023-12-11 · Effective 2024-01-16 · 88 FR 85836
Document
Document number
2023-27092
Federal Register citation
88 FR 85836
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2023-12-11
Effective date
2024-01-16
FAA docket
Docket No. FAA-2023-1216
Abstract
The FAA is adopting a new airworthiness directive (AD) for all CFM International, S.A. (CFM) Model LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP- 1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2 (LEAP-1B) engines. This AD was prompted by a manufacturer investigation that revealed that certain high-pressure turbine (HPT) rotor stage 1 disks (HPT stage 1 disks) and a certain compressor rotor stages 6-10 spool were manufactured from material suspected to have reduced material properties due to iron inclusion. This AD requires replacing certain HPT stage 1 disks and a certain compressor rotor stages 6-10 spool. The FAA is issuing this AD to address the unsafe condition on these products.