What was found
DURING THE INCOMING INSPECTION THE FOLLOWING FINDINGS WERE OBSERVED FUEL MANIFOLD TUBE CHAFED WITH HOLE AT 11 O'CLOCK POSITION AFT LOOKING FORWARD, WEAR TO THE LPT COOLING BRACKET, ABRASIONS ON COMBUSTION CASE LOCATED ON THE TOP OF THE MID-FLANGE - DAMAGE DIMENSIONS L - 19,7 MM / W - 6,2 MM / DEPTH - 0,23 MM. ALL FINDINGS ARE LOCATED IN THE ADJACENT AREA. SIGNS OF FUEL LEAKAGE WERE ALSO FOUND ON THE COMBUSTION CASE. IT MUST BE ASSUMED THAT ALL DAMAGES WAS CAUSED BY A FOREIGN OBJECT THAT MUST HAVE BEEN THERE FOR SOME TIME DURING ENGINE OPERATION. THIS TYPE OF DAMAGE TO THE COMBUSTION CASE IS NOT DESCRIBED IN THE AMM OR ESM. THE DAMAGE WAS NOTED IN THE FORM OF A DEFECT SHEET (CEES F2.13/CM08/08), AND THE ENGINEERING DEPARTMENT WAS INFORMED. ANALYSIS: AN INSPECTION BY CEES PERSONNEL FOUND PROBABLE SIGNS OF FOREIGN OBJECT IMPACT ON ENGINE COMPONENTS (FUEL MANIFOLD, BRACKET, AND COMBUSTION CASE). NO FOREIGN OBJECT (FOD) WAS FOUND DURING THE INCOMING INSPECTION. IT IS NOT POSSIBLE TO CONDUCT AN ROOT CAUSE ANALYSIS BY CEES.ALL DAMAGES ARE LOCATED OPPOSITE EACH OTHER. RISK MITIGATION ACTION: MITIGATION ACTIONS TO BE IMPLEMENTED BY THE OPERATOR. CONCLUSIONS: THE MOST PROBABLY DAMAGES ON ALL DESCRIBED LOCATIONS WAS CAUSED BY CYLINDRICAL IN SHAPE OBJECT JAMMED BETWEEN TUBE, CASE AND BRACKET. ANALYSIS AND IMPLEMENTATION OF MITIGATING ACTIONS ON THE OPERATOR SIDE.