As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED, EXPERIENCED A MAIN HYDRAULIC SYSTEM FAILURE DURING LANDING GEAR AND FLAP EXTENSION WHILE ON A VISUAL APPROACH INTO KCKV. A GO-AROUND WAS EXECUTED AND A SUBSEQUENT DIVERSION WAS MADE TO KBNA. THE LANDING GEAR WAS EXTENDED AND FLAPS WERE AT 15 DEGREES WHEN THE FAILURE OCCURRED. THE AUXILIARY HYDRAULIC SYSTEM WAS USED TO COMPLETE FLAP EXTENSION. AN EMERGENCY WAS DECLARED BY THE CREW AND THE AIRCRAFT WAS LANDED IN KBNA WITHOUT FURTHER INCIDENT.