A B777 ELEVATOR PWR UNIT SOLENOID VALVE WAS REPLACED WITH NO MAINT MANUAL REF. UNIT WAS NOT A LINE REPLACEABLE COMPONENT.

Narrative

SIT STARTED ON THE NIGHT OF DEC/WED/03. ACFT ARRIVED WITH WRITE-UP OF; ON TAXI IN FLT CTL SYS MESSAGE APPEARED. I WAS WORKING #2 ENG WHILE ANOTHER MECH WAS TROUBLESHOOTING PER FIM (FLT INFO TERMINAL) AND MAT (MAINT ACCESS TERMINAL) ON BOEING 777. THE MECH; REPLACED THE AFFECTED ACE (ACTUATOR CTL ELECTRONICS) COMPUTER NO HELP. OLD ACE WAS REINSTALLED. THE FAULT WAS THE R OUTBOARD ELEVATOR ACTUATOR AND THE MAT TERMINAL WAS: BYPASS VALVE NO RESPONSE. THE LEAD MECH TRIED TO ORDER AN ELEVATOR PCU (PWR CTL UNIT). THE AIRLINE WAS NOT IN STOCK ON THAT PART. THE LEAD CONTACTED THE COORDINATOR AND THEY WERE GOING TO ROB THE PCU OFF ANOTHER ACFT. THE LEAD MECH AND I TALKED TO THE COORDINATOR AGAIN ABOUT THE ACFT FAULTING THE BYPASS SOLENOID VALVE ON THE PCU. HE SAID YES ON A B757 AND A B767 IT IS A LINE REPLACEMENT UNIT; BUT WAS NOT SURE ON THE B777 AND HE WOULD LOOK FOR THE DOCUMENTATION. THE LEAD MECH FOUND THE SOLENOID VALVE IN THE ILLUSTRATED PARTS CATALOG MANUAL FOR THE EFFECTIVITY OF THAT ACFT. THE PART WAS DELIVERED TO THE ACFT. THEN TURNED ACFT OVER TO FIRST SHIFT ON MORNING OF DEC/THU/03. COMING BACK TO WORK THE NIGHT OF DEC/THU/03; THE ACFT WAS AGAIN ASSIGNED TO ME. THE WX WAS BAD AROUND 34 DEGS F ND MISTY RAIN. THE OTHER SHIFTS SAID THEY DIDN'T THINK THE SOLENOID VALVE COULD BE CHANGED WITHOUT REMOVING THE ELEVATOR PCU. ALSO DURING THE DAY; THE COORDINATOR INVOLVED THE B777 ANALYST OVER THE FLEET OF B777'S AND THEY LOOKED OVER THE COMPONENT; MAINT MANUAL AND DECIPHERED THAT IT WAS A LINE REPLACEABLE UNIT. WE DECIDED IT COULD BE ACCESSED AND CHANGED PER THE DIRECTION OF MY LEAD; COORDINATOR AND FLEET ANALYST. THE ELEVATOR PWR CTL UNIT DID NOT NEED TO BE REMOVED SO WE DID NOT USE THAT EQUIP. HYDS TO TAIL ISOLATED AND BREAKER PULLED PER MAINT MANUAL ELEVATOR PCU. AFTER REPLACING SOLENOID VALVE ON ELEVATOR PCU ACTUATOR; WE PUT ACFT BACK TO ORIGINAL CONFIGN PER MAINT MANUAL. TO CHK OUT THE PCU WE TURNED ON HYDS FOR A LEAK CHK. THE FLT CTL SYS MESSAGE CLRED AND LEAK CHK WAS GOOD. THROUGH MAT TERMINAL RAN TEST ON ACE MONITOR CHK AND ACE CONFIDENCE CHK BOTH PASSED; THEY WOULD NOT BEFORE. SOLENOID VALVE SIGNED OFF IN LOGBOOK; AND ACFT RELEASED BY MYSELF. 3 DAYS LATER SOMEONE NOTICED THE LOGBOOK ENTRY WHICH WAS REVIEWED BY ALL PARTIES INVOLVED; AND SAID IT CANNOT BE CHANGED WITHOUT MAINT MANUAL REF. BOEING CONTACTED AND SAID NO TO IT; CANNOT BE CHANGED BUT THEY WERE THINKING ABOUT LETTING US DO IT IN THE FUTURE. NOW ELEVATOR PCU ACTUATOR BEING REPLACED ON DEC/XA/03.