Forget about flight reviews and instrument competency checks. Part 135 operations are conducted in a thicket of regulations. Among them are the requirements of Section 299:
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a)** “No certificate holder may use a pilot, nor may any person serve as a pilot in command of a flight, unless, since the beginning of the 12th calendar month before that service, that pilot has passed a flight check in one of the types of aircraft which that pilot is to fly. The flight check shall:
1) Be given by an approved check pilot or by the administrator.
