Airworthiness Directives (ADs)
CAA-2023-04-004
The aircraft owner or operator shall comply with Airworthiness Directives issued by the CAA or the aeronautics authority of the State of Design (SoD) of the aviation products, appliances and parts, and take all necessary actions thereto.
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Issue Date
- 2023/04/10
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Applicability
- CFM International, S.A. (CFM) model turbofan engines identified in Table 1 toparagraph (c) of this AD with an installed high-pressure turbine (HPT) inner stationary seal, partnumber (P/N) 1808M56G01, that has a serial number (S/N) listed in Table 1 of CFM ServiceBulletin (SB) CFM56–5B S/B 72–0952, Revision 02, dated August 10, 2022 (CFM SB CFM56–5BS/B 72–0952); Table 1 of CFM SB CFM56–5C S/B 72–0796, Revision 02, dated August 10, 2022(CFM SB CFM56–5C S/B 72–0796); or Table 1 of CFM SB CFM56–7B S/B 72–1054, Revision 02,dated August 10, 2022 (CFM SB CFM56–7B S/B 72–1054). This AD does not apply to affected CFMCFM56–5B, CFM56–5C, and CFM56–7B model turbofan engines with the affected HPT innerstationary seal installed if the seal has been repaired as specified in CFM56–5B Engine ShopManual (ESM), 72–41–03, REPAIR 003; CFM56–5C ESM, 72–41–03, REPAIR 003; or CFM56–7B ESM, 72–41–03, REPAIR 003, after December 31, 2012.
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Model Number
- CFM International - CFM56 turbofan engines
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CAA AD Number
- CAA-2023-04-004
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Aeronautics Authority of Original AD
- FAA
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Original AD Number
- 2023-05-05
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Effective Date
- 2023/05/10
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Subject
- 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, and also revises the applicability to add CFM CFM56–5C model turbofan engines.
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Reference Publications (Revision/ATA/SB)
- This AD replaces AD 2021–10–09(CAA-2021-05-007).
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Remarks
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