20110517009709I

The flight crew and aircraft started the day in pueblo Colorado with normal preflight activities for the operation with no abnormalities reported. There were no items deferred by use of the minimum equipment list. In the previous two days the aircraft had operated on thirteen flights with no maintenance discrepancies reported by flight crews. Flight 5150 was loaded with nine passengers and their baggage that included nine normal checked bags and three normal gate checked bags. The weight and balance information shows the takeoff weight was two thousand sixty three pounds below maximum takeoff weight and within center of gravity range. The flight crew received a dispatch release from company dispatch and the flight departed pueblo, CO at approximately 0604 local time. The flight was uneventful until the landing gear was selected down during the approach to Denver, CO runway 35L. When the landing gear was selected down the flight crew received "three green" indicating gear down and locked, landing gear handle illuminated red indicating gear "in-transit" and the hydraulic power-pack motor continued to run until the landing gear relay circuit breaker popped. The approach continued and a normal touchdown was accomplished at approximately 0632 local time. While on landing roll-out the aircraft began to vibrate and the left main landing gear collapsed into a normal retracted position. The aircraft was secured by the flight crew and Denver tower was notified and crash fire and rescue personnel responded. Passengers were questioned about their condition by the crew and no injuries were reported. The aircraft was evaluated by the crew and no leaks or fire were visible. The passengers remained in the aircraft until Denver crash fire rescue personnel arrived to assist in their egress out an emergency exit on the left side of the fuselage located at seat 6A.the aircraft remained on the runway, off centerline to the left side the left wing-tip resting on the left edge of the runway. The left wing tip, aileron, outboard flap, inboard flap, lower aft nacelle, propeller, left fuselage strake, number two comm. Antenna and landing gear doors were damaged. Hydraulic fluid was leaking out at the nose landing gear. The nose landing gear extension-retraction actuator failed at the upper end of the casting. The end of the casting was fractured off and was located near the point of the runway where the left propeller first made contact with the runway surface. The national transportation safety board arrived on scene and assumed the duties of iic.