What was found
(CAN) AIRCRAFT WENT ON LOCAL FLIGHT, WHEN GEAR SELECTED DOWN ON PREPARATION FOR LANDING GEAR DID NOT GO DOWN, CREW MANUALLY PUMPED GEAR DOWN AND RECEIVED 3 GREEN INDICATION. AFTER LANDING, AIRCRAFT WAS PLACED ON JACKS AND GEAR SWINGS CARRIED OUT. GEAR FUNCTIONED CORRECTLY ON FIRST 7 RETRACTION/EXTENSION CYCLES. ON EIGHTH EXTENSION GEAR DID NOT START TO EXTEND. GEAR HANDLE 'JIGGLED' IN DOWN POSITION AND GEAR OPERATED AT THIS POINT.NEW SELECTOR ASSEMBLY INSTALLED GEAR RE-SWING NUMEROUS TIMES AND FOUND TO OPERATE NORMALLY.