What was found
(CAN) DURING A/C 20002 FLT 26, AM ELEVATOR BINDING EXPERIENCED BY CREW DURING HANDLING TESTS. AIRCREW TOOK NECESSARY PRECAUTIONS TO EVALUATE FLT CONTROL AVAILABILITY TO PERFORM SAFE LDG W/O HAVING TO DISCONNECT ELEVCCT. FOLLOWING AIR ASSESSMENT, CREW PROCEEDED TO BURN OFF FUEL TO GET WITHIN MLW & CAME IN FOR SAFE & UNEVENTFUL LDG. A/C QUARANTINED BY QA UPON ARRIVAL & THOROUGH INSP PERFORMED BY BFTC ENGINEERING AND QUALITY CNTL. INSP RESULTS REVEALED THAT PIECE OF BLIND RIVET JAMMED BETWEEN GAIN CHANGER OUTPUT CNTL ROD CLEVIS&GAIN CHANGER OUTPUT FORK LEVER.THE BLIND RIVET REMVD&GAIN CHANGER OUTPUT FORK LEVER FOUND TO BE GOUGED AS RESULT OF FOULING.