Airworthiness Directive 2023-05-05
one-timeAirworthiness Directives; CFM International, S.A. Turbofan Engines
What this AD requires
The FAA is superseding Airworthiness Directive (AD) 2021-10-09 for certain CFM International, S.A. (CFM) CFM56-5B and CFM56-7B model turbofan engines with a certain high-pressure turbine (HPT) inner stationary seal installed. AD 2021-10-09 required removal, inspection, and replacement of the affected HPT inner stationary seal and, depending on the findings, replacement of the rotating air HPT front seal, HPT rotor blades, and No. 3 ball bearing. This AD was prompted by cracks found in the rotating air HPT front seal. After the FAA issued AD 2021-10-09, the manufacturer notified the FAA that the service information incorrectly lists the year of certain honeycomb repairs and that affected HPT inner stationary seals could potentially be installed on CFM CFM56-5C model turbofan engines. This AD requires removal, inspection, and replacement of the affected HPT inner stationary seal and, depending on the findings, replacement of the rotating air HPT front seal, HPT rotor blades, and No. 3 ball bearing. This AD also revises the applicability to add CFM CFM56-5C model turbofan engines. The FAA is issuing this AD to address the unsafe condition on these products.
Which aircraft AD 2023-05-05 applies to
Applies only to engines with an installed high-pressure turbine (HPT) inner stationary seal, P/N 1808M56G01, having a serial number listed in Table 1 of CFM SB CFM56-5B S/B 72-0952 Rev 02 (Aug 10, 2022), Table 1 of CFM SB CFM56-5C S/B 72-0796 Rev 02 (Aug 10, 2022), or Table 1 of CFM SB CFM56-7B S/B 72-1054 Rev 02 (Aug 10, 2022). Does not apply to affected engines whose seal has since been repaired per the applicable Engine Shop Manual 72-41-03 REPAIR 003 after December 31, 2012.
Whether AD 2023-05-05 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.