AN MD80 RETURNED TO THE FIELD DUE TO A TAIL COMPARTMENT TEMP HIGH WARNING LIGHT CAUSED BY A LOOSE DUCT CLAMP ON THE PNEUMATIC XFEED VALVE.

Narrative

I STARTED WORKING ON THE ACFT ABOUT XA00 ON AN AUGMENTATION VALVE I TROUBLESHOT ON A LOGBOOK DISCREPANCY. I TOLD THE LEAD THIS ACFT NEEDED A PWR RUN; AND WON'T MAKE A XD30 DEP. IT WAS ABOUT XE00 CREW WAS ONBOARD AND SO WAS THE PAX SITTING DOWN AND WAITING. I WAS DONE AT XE25. MY LEAD HAD ALREADY SIGNED THE LOGBOOK THAT THE VALVE WAS REMOVED AND REPLACED AND LEAK CHK GOOD -- OPS CHK GOOD. THE SHIFT MGR KNEW THAT THE AIRPLANE NEEDED TO BE LEAK CHKED. I DO NOT HAVE AN AIRWORTHINESS DIRECTIVE RELEASE ON THE ACFT; AND I DID NOT WRITE ANYTHING ON THE LOGBOOK. I JUST REMOVED AND REPLACED THE AUGMENTATION VALVE AND I SHOULD NOT HAVE MY RECORD TARNISHED FOR ANY REASON. SO I HEARD IT MADE AN AIR RETURN 10 MINS FROM THEIR DEST. WHEN IT CAME BACK TO OUR ZONE AT ZZZ. THEY FOUND THE XFEED VALVE LEAKING. I THINK THE LCL FAA SHOULD KNOW ABOUT THIS INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AUGMENTATION VALVE WAS REPLACED AND THE DUCT CLAMPS WERE TORQUED PER THE PROCS BUT THE CAUSE OF THE WARNING WAS A LOOSE DUCT CLAMP ON THE PNEUMATIC XFEED VALVE. THE RPTR SAID THE LEAD MECH CLRED THE LOGBOOK AND THE REQUIRED RUN TO PRESSURIZE THE PNEUMATIC DUCTING WITH ENG AIR TO CHK FOR LEAKS AND PNEUMATIC VALVE OP WAS NOT ACCOMPLISHED. THE RPTR STATED THE INCIDENT WAS INVESTIGATED BY THE COMPANY AND IS NOW IN THE GRIEVANCE PROC.