What was found
EN ROUTE, THE CAPTAIN EXPERIENCED THE RT & LT ADIS FAILING WITH FLAGS & NO USE FULL INFORMATION. AN EMER WAS DECLARED & THE CAPTAIN STARTED DESCENDING. DESCENDING THROUGH 4000FT, ALL NORMAL ADI INDICATIONS & FUNCTIONS RETURNED. THE ACFT SAFELY LANDED. AVIONICS SYS WERE CHECKED, NO DISCREPANCIES WERE NOTED. R & R THE PRIMARY & SECONDARY A/C INVERTERS AS WELL AS THE PARALLELING CONTROL BOX WITH SERVICEABLE UNITS. AGAIN ALL AVIONICS & ACFT SYSTEMS WERE TESTED ON THE GND WITH NO DISCREPANCIES NOTED.