2019-23089: Airworthiness Directives; CFM International S.A. Turbofan Engines
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The FAA proposes to supersede Airworthiness Directive (AD) 2019-12-05, which applies to certain CFM International S.A. (CFM) CFM56-5B, CFM56-5C, and CFM56-7B model turbofan engines with a certain rotating air high-pressure turbine (HPT) front seal. AD 2019-12-05 requires replacement of the affected rotating air HPT front seal with a part eligible for installation. The actions required by AD 2019-12-05 are interim and only address the highest risk engines with an affected rotating air HPT front seal that have a specified number of cycles since being reconfigured. This proposed AD would require removal and replacement of the rotating air HPT front seals installed on all CFM CFM56-5B, CFM56- 5C, and CFM56-7B model turbofan engines, including engines that have fewer cycles since being reconfigured. The FAA is proposing this AD to address the unsafe condition on these products.
The agency’s own summary, as published.
What this changes
Amends 1 part of the Code of Federal Regulations — the standing rules this notice rewrites.
Rulemaking docket
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