What was found
CLE - FLT 3019 - CREW REPORTED THE LEFT SIDE AUTOFEATHER DISARMED ONCE AIRBORNE. AIRCRAFT RETURNED TO FIELD. MAINTENANCE INSPECTED AIRCRAFT AND REMOVED AND REPLACED AUTOFEATHER RELAY BOARD, P/N 129-364079-7, IAW B1900D MM 61-21-00. MAINTENANCE ALSO REMOVED AND REPLACED THE ANNUNCIATOR POWER SOURCE CIRCUIT BOARD IAW B1900D MM 31-50-00 FOR PREVENTATIVE MEASURES. AIRCRAFT RELEASED FOR SERVICE. ACFT TT, 3,421.1 HOURS. ACFT TOTAL CYCLES, 4,129. (X)