Airworthiness Directives; CFM International CFM56-5B/2P Series Turbofan Engines
airworthiness · Rule · Final rule. · Published 1998-01-21 · Effective 1998-03-23 · 63 FR 3031
Document
Document number
98-1326
Federal Register citation
63 FR 3031
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
CFM International CFM56-5B/2P Series Turbofan
Publication date
1998-01-21
Effective date
1998-03-23
FAA docket
Docket No. 97-ANE-29-AD
Abstract
This amendment adopts a new airworthiness directive (AD), applicable to CFM International (CFMI) CFM56-5B/2P series turbofan engines, that requires a reduction of the low cycle fatigue (LCF) retirement life for certain low pressure turbine (LPT) cases. This amendment is prompted by the results of a refined life analysis performed by the manufacturer which revealed minimum calculated LCF lives significantly lower than the published LCF retirement life. The actions specified by this AD are intended to prevent a LCF failure of the LPT case, which could result in damage to the aircraft.