What was found
DURING CRUISE AT FLIGHT LEVEL 31, THE NUMBER TWO ENGINE EXPERIENCED COMPRESSOR STALLS. CREW REDUCED THE NUMBER TWO ENGINE POWER TO IDLE, RETURNED TO MSP AND LANDED WITHOUT FURTHER INCIDENT. THE ENGINE WAS SHUTDOWN AFTER LANDING. MAINTENANCE FOUND A PIECE OF DELAMINATED FIBERGLASS FROM THE UPPER VHF ANTENNA LOGGED ACROSS THE NUMBER TWO ENGINE STATOR VANES. ENGINE DEBRIS WAS REMOVED, THE PS3 FILTER AND 8TH, 13TH STAGE END CAPS WERE CHECKED FOR DEBRIS. THE ENGINE WAS RUN AT TAKEOFF POWER AND ALL PARAMETERS WERE NORMAL.