What was found
FIVE SECONDS AFTER ADDING TAKEOFF POWER REAR BAY OVERHEAT LOOKUP LIGHT ILLUMINATED. LIGHT WENT OUT TWO SECONDS AFTER THROTTLE REDUCED TO IDLE. RAN ENGINES. CHECKED FOR LEAKS, NO LEAKS FOUND AT THIS TIME. FOUND HEAT BLANKET NOT SECURE ON EXPANSION PIPE OUTBOARD TEMP CONTROL VALVE. RADIATING HEAT ON OVERHEAT LOOP. SECURED BLANKET. RAN UP FULL POWER 30 SEC 3 TIMES WITH NO OVERHEAT LIGHT IAW HAWKER 1000 M/M 26-13-00.