MECH WIRES THE WRONG VALVE OPEN.

Narrative

WHILE DEACTIVATING AN INLET COWL ANTI-ICE VALVE I INADVERTENTLY REMOVED THE CANNON PLUG AND WIRED OPEN THE CSD EJECTOR VALVE BY MISTAKE AND DISPATCHED THE ACFT. THE ERROR WAS DISCOVERED DOWN LINE AND CORRECTED. THE VALVE WAS DIFFICULT TO REACH AND WAS LOCATED IN CLOSE PROX TO 2 OTHER VALVES OF SIMILAR APPEARANCE. MAINT MANUALS FOR A PARTICULAR CHAPTER LABEL DIAGRAMS OF VALVES INCLUDING ONLY THE VALVES OF THAT PARTICULAR SYS. VALVES THAT LOOK THE SAME BUT ARE IN CLOSE PROX MAY OR MAY NOT BE DEPICTED BUT ARE NEVER LABELED. IF A VALVE OR OTHER PART IS NEAR SIMILAR APPEARING ITEMS THE MAINT MANUAL DIAGRAMS SHOULD BE MORE COMPLETE TO AVOID CONFUSION. THIS ERROR CAUSED NO FURTHER DAMAGE OR INCIDENTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THE AIRPLANE HE CHANGED THE VALVES ON WAS A B727. THERE WAS A COMPLICATION TO HIS OP IN THAT HE WAS DOING THE VALVE CHANGE ON CONTRACT FOR ANOTHER AIRLINE. THIS IS DONE ALL THE TIME. AIRLINES CANNOT POS A MECH AT ALL BASES SO IF A PROB OCCURS THE AIRLINE ACQUIRES A MECH FROM A LCL AIRLINE BY A CONTRACT AGREEMENT. THE PROB IS THE MECH CANNOT USE HIS MAINT MANUALS FOR HIS AIRLINE BUT MUST USE THE DATA AND INFO SUPPLIED BY A FAX MACHINE FROM THE AIRLINE WHOSE AIRPLANE HE IS WORKING ON. THE REASON IS ALL AIRLINES; THOUGH THE MAKE AND MODEL MAY BE THE SAME; ARE CONFIGURED DIFFERENTLY. SOME AIRPLANES HAVE GENERAL ELECTRIC ENGS AND SOME PRATT AND WHITNEY AND SOME ROLLS ROYCE. THOUGH THEY MAY NOT BE ALL THAT DIFFERENT THEY FREQUENTLY HAVE DIFFERENT ACCESSORIES.