Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to CFM International (CFMI) CFM56-2, -2A, -2B, -3, -3B, and -3C series turbofan engines. This proposal would require a one-time eddy current inspection (ECI) for cracks or gouges in certain high pressure turbine rotor (HPTR) disks. This proposal is prompted by a report of a HPTR disk found to have a crack in a rim bolt hole during a routine shop manual ECI. The actions specified by the proposed AD are intended to prevent the potential for an uncontained failure of the HPTR disk, which could result in an inflight engine shutdown, aborted takeoff, or damage to the aircraft.