What was found
JFK/MIA - FLT GT870 - NR ENGINE FLAME-OUT AT TOP OF DESCENT. UNABLE TO RE-LIGHT. MAINTENANCE CHECKED THE FOLLOWING AND NO DISCREPANIES NOTED (INLET AND EXHAUST, VISUAL CHECK UNDER COWL, BLEW OUT CDP LINE. CHECKED CHIP DETECTORS, FUEL FILTER FOUND CLEAN, SUMPED NR 1 MAIN AND NR 1 RES TANKS AND NO CONTAMINATION FOUND, CONDITION MOTOR AND LINKAGE OK, DRY AND WET MOTOR OF ENGINE OK, FUEL PRESSURE AND FUEL FLOW OK). RE-RIGGED VSV/VBV. FURTHER TROUBLESHOOTING IDENTIFIED CRACK IN FLANGE OF 8TH STAGE DUCT. REPLACED DUCT ENGINE. RUN-UP SATISFACTORY. (X)