unfortunatly unless the aircraft is a multi crew aircraft then you cannot log hours in the right hand seat.
In order to log hours and be the PIC i believe you must perform the takeoff and landing.
The way to do it is to fly a 2 leg route you fly one leg,takeing off and landing then you swop into the righthand seat and then let your mate fly the rest!!
Thats the way i do it anyway
Nick
