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A comment on Boeing 737 Max pilots complained to feds for months about suspected safety flaw. Parent comment

Re:Boeing 737 Max pilots complained to feds for months about... by marcus0x62 on Wednesday March 13, 2019 @09:59AM (#19378647)
The rough cylinder bore didn’t help, but the root cause was the design of the bottom ledge of the oil control ring grooves and the lack of proper drainage.

A popular shade tree mechanic fix was to drill drain back holes in the oil control ring groove: https://m.youtube.com/watch?v=UrnblJ8VZtY

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