Summary
The Federal Aviation Administration (FAA) proposes to revise an existing airworthiness directive (AD), applicable to CFE Company Model CFE738-1-1B turbofan engines. That AD currently requires a one-time visual inspection of Stage 2 high pressure turbine (HPT) aft cooling plates for nicks, dents, raised metal, and scratches, and if necessary, repair of the cooling plates or replacement with serviceable parts. This proposal is prompted by an updated alert service bulletin (ASB) that reduces the number of stage 2 HPT aft cooling plates affected by this AD and identifies the applicable engines by engine serial numbers (SN's). In the event that the affected gas generator modules containing the affected parts have been transferred to another engine, the SN's of those gas generator modules have been added to this AD. The actions specified by the proposed AD are intended to prevent stage 2 HPT aft cooling plate failure, which could result in an uncontained engine failure and damage tothe airplane.