The FAA has issued its final rule on the controversial airworthiness directive that will require the replacement of cylinders on 6,200 high-displacement Continental engines. It takes effect on Sept. 15. The AD, which scraps thousands of aftermarket cylinders made by ECi, was initially proposed in 2013 for 520, 550 and some 470 model Continentals that had ECi cylinders installed. The agency said there were too many reports of cracks and cylinder head separations involving the cylinders and wanted all of them sold between September of 2002 and June of 2009 replaced.
This is a companion discussion topic for the original entry at https://www.avweb.com/ownership/eci-cylinder-ad-takes-effect-sept-15