New AD on Continental Engines dated February 23, 2023
Wright Brothers Master Pilot, FAA Commercial Pilot
Aviation Director, Cessna Owners Organization Forum Moderator and Cessna Owners Author.
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This is what can happen if one of the circlips isn't fully seated and the counterweight pin comes out.
This happened on the second test flight of an overhauled O-470 . The counterweight exited the engine making a 6" hole in the case and breaking off the right mag. The counterweight was found lying on top of the engine after landing.
Good shots T , thanks, carl