What was found
(CAN) DURING A ROUTINE MEDEVAC AND TEN MINUTES AFTER DEPARTURE THE RED LIGHT IN THE IN THE LANDING GEAR HANDLE ILLUMINATED.VISUAL CONFIRMATION OUT CAPT SIDE WINDOW OF LANDING GEAR PARTIALLY DOWN. A MANUAL GEAR EXTENSION WAS INITIATED AND A UNEVENTFUL LANDING WAS COMPLETED. TELCOM WITH MTCE. AND FLIGHT CREW CONFIRMED, LANDING GEAR MOTOR WAS NON FUNCTIONING. VISUAL INSP WAS C/O BY CREW FOR DAMAGE OR EXCESSIVE FLUID LOSS, WITH NONE OBSERVED. AC WAS RETURNED WITH LANDING GEAR IN THE DOWN/ LOCKED POSITION, ESSENTIAL CREW ONLY ON BOARD. MAINT INSPECTION REVEALED,THE L/G HYD POWERPACK HAD INTERNALLY FAILED TO MAINTAIN SYS PRESSURE,CAUSING THE PUMP TO RUN AND EXCEEDED OPERATIONAL TOLERANCE WHICH POPPED THE C/B. REPLACEMENT OF THE HYD POWER PACK ASSY WAS CARRIED OUT, AND SYS FUNCTIONS WERE RESTORED. (TC NR 20070424004)