Airworthiness Directive · Amendment 39-9742 · CFM International, S.A. Engines
CFM International, S.A. Engines
This AD applies to CFM International, S.A. CFM56-2, CFM56-2A, CFM56-2B, CFM56-3, CFM56-3B, CFM56-3C, CFM56-5, CFM56-5-A1/F, CFM56-5A4, CFM56-5A4/F, CFM56-5A5, CFM56-5A5/F.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment adopts a new airworthiness directive (AD), applicable to CFM International (CFMI) CFM56-2/-2A/-2B/-3/-3B/-3C/-5 series turbofan engines, that requires part number reidentification of certain low pressure turbine rotor (LPTR) stub shafts and conical supports, and reduction of the low cycle fatigue (LCF) retirement lives for these reidentified parts. 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 published LCF retirement lives. The actions specified by this AD are intended to prevent an LCF failure of the LPTR stub shaft and conical support, which could result in an uncontained engine failure and damage to the aircraft.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
