Airworthiness Directive · Amendment 39-18857 · CFE Company Turbofan Engines
CFE Company Turbofan Engines
This AD applies to CFE Company (CFE) CFE738-1-1B model turbofan engines with a high-pressure compressor (HPC) impeller, part number (P/N) 6079T77P07 or P/N 6079T77P09, with a serial number listed in CFE Service Bulletin (SB) CFE738-72-8080, Revision 0, dated August 18, 2016, installed.
We are adopting a new airworthiness directive (AD) for certain CFE Company (CFE) turbofan engines. This AD was prompted by a quality escape for high-pressure compressor (HPC) impellers made from forgings with nonconforming material grain size. This AD requires removal of the HPC impeller. We are issuing this AD to correct the unsafe condition on these products.
Remove all affected HPC impellers from service at the next piece-part exposure and replace with a part eligible for installation.
For the purposes of this AD, “piece-part exposure” is defined as separation of the impeller from the compressor rotor assembly.
