Emergency AD on certain TCM engines

The FAA has issued an emergency AD that relates to certain TCM engines. The emergency AD results from TCM reporting three occurrences of rapid wear on the face of hydraulic lifters, part numbers (P/Ns) 657913, 657915, and 657916, at 5, 6, and 38 hours time-in-service. This condition, if not corrected, could result in loss of engine power and loss of control of the airplane.

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