The pilot and three passengers were on a night flight in an aircraft that was equipped to carry skydivers. During the approach to land, the landing light failed. While attempting to get the light to operate, the pilot allowed an undershoot to develop. Subsequently, the aircraft landed short of the runway and the nose gear failed when the nose- wheel struck the runway lip. The aircraft then slid approximately 300 feet and nosed over. Mirl & threshold lights were installed, but there were no vasi lights.
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