What was found
DURING PREFLIGHT CHECKS ON THE 18TH, THE AP1 FAILED, AND THE FLIGHT WAS CANCELLED. AFTER CONSULTATION WITH MAINTENANCE PERSONNEL AND SIKORSKY, THE CREW WAS ASKED TO RECOVER THE AIRCRAFT, TO HOME BASE (KDAL), FROM AUSTIN (KAUS), AND MEL'ED THE AIRCRAFT ON THE 19TH. APPROXIMATELY 35 MINUTES INTO THE FLIGHT, IN THE VICINITY OF WACO, TX, THE 2ND AP SYSTEM (SAS) FAILED. AN EMERGENCY WAS DECLARED AND AIRCRAFT LANDED AT KACT (WACO), WITHOUT FURTHER INCIDENT. THE AUTOPILOT CONTROL MODULE WAS REPLACED. NO FURTHER ISSUES WERE NOTED.