What was found
ON APPROACH TO LANDING, THE LANDING GEAR WOULD NOT NORMALLY EXTEND. THE FLIGHT CREW USED THE ALTERNATE HAND PUMP FOR EXTENSION AND PERFORMED AND UNEVENTFUL LANDING. MAINTENANCE CONFIRMED THAT THE LANDING GEAR HYDRAULIC MOTOR RELAY WOULD FREEZE AND NOT OPERATE THE HYDRAULIC POWER PACK. THE RELAY WAS REPLACED AND ALL SYSTEMS OPERATED NORMAL. POST REMOVAL INSPECTION OF THE OLD RELAY CONFIRMED THAT THE PLUNGER CAVITY WAS CONTAMINATED WITH WATER.