What was found
RUDDER PCU SYSTEMS NR 1 & 2 FAILED BOTH PCU AND BEARING BACKLASH. SYSTEM NR 1 PCU MEASURED 0.330IN WITH A MAX OF 0.250IN & A BEARING BACKLASH OF 0.180IN WITH A MAX OF 0.120IN. SYS NR 2 PCU MEASURED 0.273IN WITH A MAX OF 0.250IN & A BEARING BACKLASH OF 0.135IN WITH A MAX OF 0.120IN. IAW FIM 27-21-00-810-813-A01, DUE TO FAILED BEARING BACKLASH, RUDDER UPPER & LOWER HINGE BEARINGS REQUIRE INVESTIGATION OR REPLACEMENT. TEMPORARY INSTALLED UPPER & LOWER RUDDER CENTER HINGE FITTING IAW RIL 2103, UPON TORQUING OF FASTENERS FOUND UPPER FITTING WOULD NOT TORQUE TO SPEC (CAUSING LOCK FASTENERS TO BE OUT OF SPEC) REMOVED BOTH FITTINGS AND DID NOT LEAVE ANY HARDWARE OR DOCUMENT ANY SHIM. REMOVED UPPER RUDDER CENTER HINGE FITTING TO RE-LOCATE HINGE LINE. REMOVED UNSERVICEABLE UPPER & LOWER RUDDER CENTER HINGE FITTING BEARING & REPLACED WITH NEW SERVICEABLE UPPER AND LOWER HINGE FITTING BEARING IAW RIL 1213 REV (A). REMOVED UNSERVICEABLE UPPER & LOWER RUDDER CENTER HINGE FITTING BEARING & REPLACED WITH NEW SERVICEABLE UPPER & LOWER RUDDER CENTER HINGE FITTING BEARING IAW RIL 1213 REV (A . UPON INVESTIGATION DUE TO LOWER & UPPER RUDDER CENTER FITTING IN GOOD CONDITION, INSTALLED LOWER AND UPPER RUDDER CENTER FITTING IAW SRM 51-42-21-001-001-A01 & RIL 1213 REV. A STEP 12. REFER TO TASK 3A FOR REPLACEMENT OF BEARINGS ON BOTH RUDDER FITTING., INSTALLED 6EA SAME SERVICEABLE ADEL CLAMPS ON ALONG RT & LT SIDE ON VERTICAL STAB IAW SRM 51-41-04-001-001-A01. SHOULD BE READ, INSTALLED 6EA SAME SERVICEABLE ADEL CLAMPS ON ALONG RT & LT SIDE ON VERTICAL STAB IAW AMM 20-21-00-910-801-A01. R & R FOR NEW SERVICEABLE 2EA OF ADEL CLAMPS ON LT HYD LINE OF VERTICAL STAB. IAW AMM 20-21-00-910-801-A01. COMPLIED WITH BACKLASH TEST OF THE RUDDER CONTROL SYSTEM, PASSED #1 MEASURED @ .043, #2 MEASURED @ .042, AND #3 MEASURED @ .037. DTI VALUES: #1 .005, #2 .004, AND #3 .005. IAW CRJ-900 AMM 27-21-00-720-804 A02. PERFORMED OPS TEST OF RUDDER CONTROL SYSTEM IAW CRJ-900 AMM 27-21-00-710-801-A01. OPS CHECK GOOD COMPLIED WITH REMAINING STEPS OF RIL 1213 REV A