AD 2017-19-20
Effective 10/27/2017 · Published 09/22/2017
Airworthiness Directives; General Electric Company Turboshaft Engines
Summary
We are adopting a new airworthiness directive (AD) for certain General Electric Company (GE) CT7-8A and CT7-9B model turboshaft engines. This AD was prompted by reports from the manufacturer that the high-pressure compressor (HPC) impeller installed on these engines may have suffered from material degradation during the manufacturing process. This AD requires removal of the affected HPC impellers. We are issuing thi…