Corrosion From Inactivity Flagged On Pratt-powered 777 Engine Parts

United Airlines
Pratt & Whitney PW4000-powered United Airlines 777 in short-term storage.
Credit: Sean Broderick / AWST
Inactivity during the fleet’s year-plus grounding is leading to corrosion on Pratt & Whitey PW4000-series air/oil heat exchangers, prompting the FAA to mandate inspections before affected Boeing 777s return to service. A direct final rule made public April 14 outlines the issue and orders...

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