A B737-300 WAS DISPATCHED WITH AN ENG COMBUSTER BLANKING PLATE MISSING CAUSING HIGH EXHAUST GAS TEMP AND ENG OVERHEAT WARNING.

Narrative

I FINALED A CFM ENG SERIAL NUMBER YYYY THAT WAS INSTALLED ON A B737-300 L/R ACFT. THE ENG WAS INSTALLED ON JUL/XY/97. ON JUL/XZ/97; AFTER HIGH EGT PROBS IT WAS DISCOVERED BY LINE MAINT THAT A BLANKING PLATE WAS LEFT OFF THE DIFFUSER CASE AT 12 O'CLOCK POS UNDER A HEAT SHIELD. THE ENG WAS A 'SPECIAL' AND NOT A NORMAL SHOP VISIT. THE ENG CAME IN THE SHOP FOR MAKING METAL IN THE N2 GEAR BOX WAS REPAIRED; AND THE PLAN WAS TO RUN THE ENG IN TEST CELL. NORMALLY WE AT ACR DON'T RUN CFM ENGS. AT PREPARATION TO RUN THE ENG TEST CELL REMOVED THE BLANKING PLATE. AFTER RUNNING THE CFM; IT WAS NOT INSTALLED. AFTER QEC INSTALLED ON ENG; I INSPECTED AND FINALED THE ENG; CONSISTING OF A VISUAL INSPECTION. THE BLANKING PLATE IS NEVER REMOVED IN THE SHOP; AND IT'S NOT A SUSPECT AREA OR IS IT A REPAIR/REPLACEMENT AREA IN OUR WORK PACK. THE ITEM WAS MISSED BY ME AND CAUSED FURTHER OVER-TEMP PROBS. ACR SELF DISCLOSED ON ACFT XYZ AND THIS DATE AUG/XX/97; I WAS MADE AWARE OF THE MISSING PLATE. HUMAN FACTOR PROBS: DOCUMENTATION OF WORK; NO MANUALS FOR TEST CELL OR WORK PACKS. PARTS REMOVED NOT TAGGED OR DOCUMENTED FOR REMOVAL. PPFA MAINT PERSONNEL STRIP/SHIP ENGS TO VENDOR; WHEN ENG RETURNS BOLT ON QEC FOR ENG CHANGES ON LINE.