What was found
(CAN) LANDING GEAR FAILED TO EXTEND. CREW ACTIVATED EMERGENCY EXTENSION. STILL NO INDICATION ON RT GEAR POSITION. SWITCHED BULBS ON GEAR INDICATOR AND DISCOVERED ONE BULB U/S. LANDING CARRIED OUT NORMALLY. FOUND HYDRAULIC POWER PUMP MOTOR BRUSHES WORN. REPLACED WITH OVERHAULED UNIT, REPLACED CONTROL RELAY AS WELL. RECORDS RESEARCH DISCOVERED AVERAGE LIFE IS APPROX. 1700 HOURS BETWEEN FAILURES, WE HAVE ELECTED TO PLACE THIS PART ON A 1500 HOUR REPLACEMENT. (TC NR 20060509005)