What was found
(CAN) ELEVATOR SEEMED TO JAM WHEN NOSE UP APPLIED ON LANDING BEFORE IT REACHED THE STOP. INSPECTED ELEVATOR CONTROL SYS & FOUND TRAVEL LIMITED TO 11 DEGREES NOSE UP. INSPECTED SYS FOR OPERATION & FOUND LOOSE PIECE OF PLASTIC, FOD, LODGED IN COPILOTS YOKE BOOT PREVENTING CONTACT WITH AFT STOP. PLASTIC REMOVED & SYS OPERATIONS CHECKED SERVICEABLE. TRAVEL CHECKS IN LIMITS IAW AMM 27-30-00 16 DEGREES UP & 9 DEGREES DOWN. UNABLE TO DETERMINE THE SOURCE OF THE FOD.