What was found
BRAND NEW ELT UNIT AMERIKING AK-450 WAS INSTALLED ON THE AIRCRAFT 8/04. UNIT WORKED AFTER INSTALLATION WITH REMOTE PANEL, G-SWITCH AND TOGGLE SWITCH LOCATED ON THE UNIT AND AT SUBSEQUENT ANNUAL INSPECTION. AIRCRAFT HAS FLOWN APPROXIMATELY 25 HOURS SINCE INSTALLATION. ELT UNIT WAS FOUND DEFECTIVE DURING A ROUTINE INSPECTION ON 5/15/06. THE SIX D BATTERIES WERE FOUND TO BE AT FULL CHARGE, NO SIGNS OF CORROSION. UNIT SENT BACK TO AMERIKING IN CA. FOR WARRANTY REPAIR.