What was found
DURING TAKEOFF ROLL AT 60 PERCENT TORQUE WARNING HORN SOUNDED, AUTO FEATHER ARM LIGHT DID NOT ILLUMINATE TILL 65 PERCENT. HORN CONTINUED TO SOUND, TAKEOFF WAS ABORTED. ALL OTHER PARAMETERS WERE WITHIN TAKEOFF SETTINGS. PERFORMED AUTO FEATHER TEST OPERATIONAL CHECKED GOOD IN ACCORDANCE WITH MM. COMPLIED WITH WORKCARD 31-50 00Q. TAKEOFF WARNING SYSTEM OPS CHECKED GOOD. PERFORMED HIGH SPEED TAXI WITH CREW AND COULD NOT DUPLICATE. CHECKED GOOD FOR SERVICE.