What was found
(CAN) FLIGHT CONTROL FAULT ON APPROACH, FLAPS JAMMED AT FLAPS 1, UNABLE TO EXTEND. PERFORMED QRH, RETRACTED GEAR, CIRCLED FOR APPROXIMATELY 15 MINUTES AND SUBSEQUENTLY LANDED AT PARTIAL FLAPS. DID NOT DECLARE PAN PAN WITH ATC, BUT ATC ADVISED THEY WOULD HAVE CFR ON STANDBY. RESOLUTION: FLAP .5 CHECK RT MECH DRIVE FAULT MSG ON PFR. PERFORMED TSM 27-51-00-810-818-A, AND OPS TEST OF FLAP SYSTEM CHECKS NORMAL. INSPECTED INTERCONNECTING STRUT ADJUSTMENT. NO ADJUSTMENT REQUIRED. REF AMM 27-51-44-820-001.