Airworthiness Directive · Amendment 39-13020 · CFM International CFM56-5 and -5B Series Turbofan Engines
CFM International CFM56-5 and -5B Series Turbofan Engines
Superseded. A later AD replaced this one: AD 2007-03-15. Comply with the one in force.
This airworthiness directive (AD) is applicable to CFM International CFM56-5 and -5B series turbofan engines that have an EGT upper harness part number (P/N) CA170-00, with a serial number (SN) of YC021674 or lower, or an EGT lower harness P/N CA171-00, with a SN of YC026641 or lower, or an EGT coupling P/N CA172-02 with a SN of YC166736 or lower. These engines are installed on, but not limited to Airbus Industrie A318, A319, A320 and A321 airplanes.
This amendment adopts a new airworthiness directive (AD), that is applicable to CFM International CFM56-5 and -5B series turbofan engines. This amendment requires the establishment of an exhaust gas temperature (EGT) baseline and trend monitoring using the System for Analysis of Gas Turbine Engines (SAGE), or equivalent, as an option to EGT harness replacement, and if necessary, replacement of certain EGT harnesses and EGT couplings as soon as a slow and continuous EGT drift downward is noticed after the effective date of this AD. This amendment is prompted by reports of erroneous EGT readings. The actions specified by this AD are intended to prevent unexpected deterioration of critical rotating engine parts due to higher than desired engine operating EGT's.
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.
