What was found
TWO TIMES WITHIN TWO WEEKS FOUND ACK TECHNOLOGIES ELT'S, MODEL ACK E01, INOPERABLE. ON DISASSEMBLY, FOUND THE D-CELL BATTERIES, TERMINALS, AND CIRCUIT BOARD CORRODED. TERMINALS AND CIRCUIT BOARDS WERE CLEANED, NEW BATTERIES INSTALLED, BUT THE ELT WAS STILL INOPERABLE. CAUSE - BAD SEALING.