INFLT FIRE. ACR CREW HAS AN INFLT FIRE INDICATION DUE TO IMPROPER MAINT WORK.

Narrative

ON MAR/TUE/95; AN AIRLINE FLT DEPARTING FROM SFO HAD A FIRE WARNING ON THE #1 ENG SHORTLY AFTER TKOF REQUIRING AN ENG SHUTDOWN. THE ACFT RETURNED TO SFO AT WHICH TIME AN AIR LEAK WAS DISCOVERED AT THE THRUST REVERSER BLOCKER VALVE LOCATION. THIS LEAK HEATED THE FIRE LOOP WHICH IS WITHIN APPROX 4-6 INCHES OF THIS AREA CAUSING THE FIRE INDICATION. THE BLOCKER VALVE HAD BEEN REPLACED PER OUR AIRLINE'S OPERATIONAL AND MAINT MANUAL WRITTEN DOCUMENTATION. THIS PAPERWORK DID NOT CONTAIN A LEAK CHK REQUIREMENT; ONLY AN OPERATIONAL CHK PER OUR AIRLINE'S JET HANDBOOK SECTION WHICH CHKS REVERSER OP WITH ENG RUNNING. THE ENGINEERING DEPT FOR THIS ASPECT OF ENG MAINT WAS CONTACTED AND WILL BE INCORPORATING A LEAK CHK INTO THE AFOREMENTIONED PAPERWORK; AS WELL AS EVALUATING A PRELOAD PROB AT THE SAME AREA. THIS CONDITION HAS BEEN NOTED WITH SOME INSTALLATIONS WHERE A GAP OF UP TO 1 INCH WILL EXIST BTWN THE MATING FLANGES OF THE BLOCKER VALVE AND THE PNEUMATIC DUCTING WITH ONE OF THE CONNECTING 'V' CLAMPS REMOVED.