Airworthiness Directives; CFM International CFM56 Series Turbofan Engines

This amendment adopts a new airworthiness directive (AD) that is applicable to CFM International (CFMI) CFM56-5C4/1 series turbofan engines. This action requires that the LPT conical support, P/N 337- 002-407-0, installed in CFM56-5C4/1 engines, be removed from service at or before reaching the cyclic life limit of 9,350 cycles-since-new (CSN). This amendment is prompted by the discovery of an error in the Time Limits Section of Chapter 5 of the CFM56-5C Engine Shop Manual. The manual incorrectly lists the published cyclic life limit of the CFMI CFM56-5C4/1 LPT conical support, (P/N) 337-002-407-0, as 15,000 CSN, rather than the certified value of 9,350 CSN. The actions specified in this AD are intended to prevent LPT conical supports from remaining in service beyond their certified cyclic life limit, which could result in an uncontained engine failure and damage to the airplane.