FAR 61.51 e)
A private pilot may log as PIC time only for that flight time during which that person-
i) Is the sole manipulator of the controls of an aircraft the pilot is rated or has priveledges
ii) Is the sole occupant of the aircraft; or
iii) .....acting as the PIC of an aircraft on which more than one pilot is required under type certifiaction.... (this is not the same as where an operator chooses to have two pilots in an aircraft which only requires one)