FWIW I spoke with the ECI rep at Arlington last year. He said the problems with the ?B? group were caused by a new assembly technique and it was absolutely a valid AD/SB. He also said that ECI fought against the SB/AD for the ?A? group because statistically the failure rate was no greater that other cylinders out in the field (read their cylinders as well as their competitors). Good luck.
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Hugh
Northern California
RV-7 Flying
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