What was found
PILOTS REPORTED THAT THE RT ENGINE ATTEMPTED TO AUTOFEATHER ON ABOUT A 3 NAUTICAL MILE FINAL. THE AFX DISABLE ANNUNCIATOR ILLUMINATED WHEN THIS OCCURRED AND THE AUTOFEATHER SWITCH WAS IN THE ARMED POSITION. RT SIDE FLUCTUATED BETWEEN 400 AND 1700 LBS. LT TORQUE WAS STABLE AT APPROX 1000 LBS. MAINT RT ENGINE SLOW TO RESPOND TO POWER INPUT CHANGES AND MX REMOVED AND REPLACED THE FUEL CONTROL UNIT. IAW MM 73-20-00. RII INSPECTIONS COMPLIED WITH. OPS CHECKS WERE GOOD.