Pratt & Whitney has reduced life limits on PW1500G and PW1900G geared turbofan (GTF) high-pressure compressor (HPC) front hubs after excessive corrosion was discovered during a routine overhaul, and the FAA plans to mandate the change. The US agency, in a notice of proposed rulemaking (NPRM) published May 31, said Pratt discovered corrosion on a front hub “during a routine engine overhaul.” It was found beneath anti-corrosion coating. The issue “reduces the low-cycle ...

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