Airworthiness Directives; CFM International S.A. Turbofan Engines
airworthiness · Rule · Final rule; request for comments. · Published 2018-12-26 · Effective 2019-01-10 · 83 FR 66090
Document
Document number
2018-27920
Federal Register citation
83 FR 66090
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
CFM International S.A. Turbofan
Publication date
2018-12-26
Effective date
2019-01-10
FAA docket
Docket No. FAA-2018-1039
Abstract
We are superseding Airworthiness Directive (AD) 2018-18-01 for all CFM International S.A. (CFM) Model CFM56-7B turbofan engines. AD 2018-18-01 required initial and repetitive inspections of certain fan blades and, if they fail the inspection, their replacement with parts eligible for installation. This AD requires the same initial and repetitive inspections but revises the compliance time for the initial inspections and revises the installation prohibition based on the updated compliance time. This AD was prompted by further analysis by the manufacturer that indicated a need to reduce the initial fan blade inspection interval based on an ongoing root cause investigation of an April 2018 engine failure. We are issuing this AD to address the unsafe condition on these products.