What was found
(CAN) ON TAKEOFF AT 500 AGL, 3 TO 4 STALLS ON NR 2 ENGINE, LOUD POPPING NOISE, ATC SAW FLAMES COMING OUT. AIRCRAFT RETURNED TO DEPARTURE, ENGINE BOROSCOPE FOUND DAMAGED COMPRESSOR BLADES FROM STAGE 6 TO STAGE 9. ENGINE REMOVED FROM AIRCRAFT AND SENT TO SHOP FOR INVESTIGATION. (L-4298804) (TC NR 20070312002)