The FAA is aware of three events involving failure of check valve part number C100490-1, Item No. 82 of Figure 03 in the Illustrated Parts Catalog Rev. 23 involving the oil system “Valve – Flap Check” on serial numbers 208B2197 and 208B5000 and on. These airplanes are commonly referred to as “208B EX” or “EX” and incorporate the Textron PT6A-140 engine installation.
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