What was found
PRESS AUTO FAIL AND ALT NOT WORKING FAULTS WHEN TURNED ON AND FAULT CODE 059 REMAINS. ON INTIAL BOTH CABIN CONTROLLERS WERE FAULTING.DIDNT COMPLETE AFTER MOVING FROM MANUAL TO AUTO TO ALTN.NO EXISTING FAULTS. REF FIM TASK 21-31 TASK 824. FOUND CABIN PRESSURE CONTROLLER #1 CHANGED #1 CABIN PRESS CONTR SYSTEM TEST NEEDS TO BE IN RIGHT CONFIG. MANUAL WORKS AND AND #2 WITH FAULT "CONTRLR LRU FAIL. CODE 059". PERFORMED ROTABLE PARTS CHANGE WAS INDICATED - TT # 1686206 SN OFF 2021 VISUALLY CHECKED OUTFLOW VALVE NO DEFECT ON OUTFLOW NOTED. AFTER GROUND TEST REF FIMTASK 21-31-824 SYSTEM TEST OK. NO FAULTS FURTHER CHECKING NO EXISTING FAULTS NOTED. NOTED IN GROUND TEST.. BUT #2 CONTROLLER STILL SHOWED 01 PREV IPC REFERENCE # 21-20-00 R AND R BOTH #1 AND #2 CABIN PRESS CONTR REF AMM 21-31-01-000/400-801. PARTS USED: 29-2131-9-0003,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1762399 SN OFF 2028 CONTROLLER, CAB OFF 29-2131-9-0003 2028 ON 29-2131-9-0003 8457