§91.109 Flight instruction; Simulated instrument flight

§91.109 Flight instruction; Simulated instrument flight and certain flight tests

(c) No person may operate a civil aircraft in simulated instrument flight unless –

(1) The other control seat is occupied by a safety pilot who possesses at least:

(i) A private pilot certificate with category and class ratings appropriate to the aircraft being flown

(2) The safety pilot has adequate vision forward and to each side of the aircraft, or a competent observer in the aircraft adequately supplements the vision of the safety pilot.

For more information refert to §91.109