What was found
NUMBER TWO SURGE ON DESCENTCREW REPORTS ENGINE #2 SURGE STARTED APPROX 25K ALTITUDE, THROTTLE WAS SET BETWEEN FLIGHT DETENT AND 50% SETTING AND HAD A 10-15% N1 SURGE AND VIBRATIONS WITH AN EGT ABOUT 150 ABOVE ENGINE 1. CREW REPORTS AFTER THROTTLE WAS AT IDLE, COULD NOT GO ABOVE IDLE WITHOUT SURGE RETURNING. PERFORMED INLET AND EXHAUST SECTION REF FIM 71-05 TASK 805, NO DEFECTS NOTED DURING INSPECTION PERFORMED EEC BITE REF FIM 73-00 TASK 801. NO FAULTS NOTED IN RECENT FAULTS. FOUND EVIDENCE OF METAL SHAVINGS IN TAILPIPE OF NUMBER 2 ENGINE CREW DEBRIEF: E2 SURGED AT FL 25000, 10-15% SURGE WITH AN EGT RISE 150 ABOVE E1.AFTER THROTTLE AT IDLE, TRIED TO GO ABOVE IDLE AND SURGE RETURNED. FROM POWERPLANT ENGINEERING: REFER TO AMM 71-00-00-800-804-F00, AMM 71-00-00-210-801-F00, AND FIM 71-05-00-810-805-F00 FOR INITIAL DIRECTION WITH TROUBLESHOOTING AND INSPECTING FOLLOWED FIM# 71-05 TASK 805. PERFORMED AMM# 71-00-00-210-801-F00 UP TO STEP D.(3). SENT TO INSPECTION FOR BOROSCOPES. PERFORMED BOROSCOPE INSPECTION ON #2 ENG S/N 658707 PER 71-00-00-210-801F00. INSPECTED HPC AND FOUND SEVERAL STAGES WITH EXTENSIVE DAMAGE BEYOND LIMITS. REPLACED PLUG / CONNECTOR, REF EA 7200-04105 REPLACED ENGINE ON ENGINE CHANGE JOB CARD 58-7200-9-0006