AN MD90 WAS DISPATCHED AFTER MAINT WITH SUSPICION THAT A WIPE RAG WAS LEFT IN THE ENG COWLING. ACFT INCURRED A #1 ENG FIRE ON TKOF AT THE FIRST DOWNLINE STATION.

Narrative

ON THE OCT/XA/99; I WAS PERFORMING MAINT ON ACFT XYZ AN MD90 ACFT OF ACR XX. I WAS PERFORMING MAINT ON THE #1 ENG; 'B' FIRE LOOP SYS. I REPAIRED THE SYS. I INSPECTED THE AREA; CLOSED THE ENG AND RAN IT FOR APPROX 5 MINS DUE TO OIL INDICATION FOR THE LAYOVER MAINT ON THAT AIRPLANE. DUE TO POSITIONING AND NATURE OF MY REPAIR I MAY HAVE MISPLACED MY RAGS/CLOTH THAT I HAD WITH ME WHILE WORKING. THIS IS SOMETHING THAT WAS NOT EVIDENT TO ME ON MY FINAL INSPECTION AND CLOSE-UP OF THE ENG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE RAG WAS LATER FOUND WITH THE REMOVED FIRE LOOP PART. THE RPTR SAID BY ALERTING EVERYONE AND INSPECTING #1 ENG AT A DOWNLINE STATION A MAINT DELAY OCCURRED. SUPPLEMENTAL INFO FROM ACN 451222: MAINT LATER CHKED THE ENG AND FOUND ASHES IN THE ENG THAT THEY BELIEVE WAS FROM SOME KIND OF FOREIGN OBJECT DAMAGE. CALLBACK CONVERSATION WITH RPTR OF ACN 451222 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FLT WAS ORIGINATED IN ZZZ IN THE MORNING AFTER A OVERNIGHT LAYOVER WHERE MAINT WORKED A CHRONIC #1 ENG FIRE WARNING LOOP 'B.' THE RPTR SAID THE #1 ENG HAD A CHRONIC HISTORY OF INTERMITTENT TEST AND FALSE WARNING. THE RPTR STATED THIS WAS NO FALSE WARNING AS WHEN THE COWLING WAS OPENED ASHES WERE FOUND IN THE COWLING UNDER THE HOT SECTION OF THE ENG.