Airworthiness Directive · Amendment 39-15270 · CFM International, S.A. CFM56-5C4/1 Series Turbofan Engines
CFM International, S.A. CFM56-5C4/1 Series Turbofan Engines
This AD applies to CFM International, S.A. CFM56-5C4/1 series turbofan engines with low pressure turbine (LPT) conical support, part number (P/N) 337-002-407-0, installed. These engines are installed on, but not limited to, Airbus A340 series airplanes.
The FAA is superseding an existing airworthiness directive (AD) for CFM International, S.A. CFM56-5C4/1 series turbofan engines. That AD currently requires that the low pressure turbine (LPT) conical support, part number (P/N) 337-002-407-0, be removed from service at or before reaching the cyclic life limit of 9,350 cycles-since-new (CSN). This AD requires that the same P/N LPT conical support be removed from service before reaching the new, relaxed cyclic life limit of 20,000 CSN. This AD results from CFM International, S.A. performing a life extension study of the LPT conical support, P/N 337-002-407-0. We are issuing this AD 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.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
(f) Remove LPT conical support, P/N 337-002-407-0, at or before accumulating 20,000 cycles-since-new (CSN) and replace with a serviceable part.
(g) After the effective date of this AD, do not install any LPT conical support, P/N 337-002-407-0, with 20,000 or more CSN, into CFM56-5C4/1 series turbofan engines.
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.
