As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6598 - IAD-RDU - DURING CRUISE DECLARED AN EMERGENCY AND DIVERTED TO LYH DUE TO THE LEFT ENGINE SURGING WITH AN INDICATED TORQUE OF 120 PERCENT AND ASSOCIATED YAW. CREW SHUT DOWN ENGINE. AIRCRAFT LANDED AT LYH WITH NO FURTHER INCIDENTS. LYH IN CURRENTLY CHANGING ENGINE. (M)