What was found
ON TAKEOFF ROLL, CREW FELT A 'POP' AND PULL TO THE RIGHT. ENGINE INDICATIONS NORMAL. NORMAL ON CLIMBOUT UNTIL APPROXIMATELY 19 THOUSAND FEET, NR 2 ENGINE COMPRESSOR STALL TYPE NOISE. PULLED BACK TO IDLE AND NOTED FAINT LOW FREQUENCY VIBRATION. *S/D* ENGINE WAS REMOVED. DURING SHOP DISASSEMBLY, MAINTENANCE FOUND A 6TH STAGE COMPRESSOR VANE SEGMENT INNER PLATFORM LIBERATED FROM THE VANE SEGMENT. THIS VANE SEGMENT FAILURE CAUSED THE COMPRESSOR TO STALL.