Airworthiness Directive · Amendment 39-10286 · CFM International CFM56-5B/2P Series Turbofan Engines
CFM International CFM56-5B/2P Series Turbofan Engines
CFM International (CFMI) CFM56-5B1/2P, -5B2/2P, - 5B3/2P, and -5B4/2P turbofan engines, installed with low pressure turbine (LPT) case, Part Number (P/N) 338-117-004-0, installed on but not limited to Airbus A320 and A321 series aircraft.
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.
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.
