An SF-340 suffered a complete loss of the main hydraulic system and pressure due to a failed hydraulic line. The flight crew landed safely and the aircraft towed to the gate where ground personnel failed to have wheel chocks available to secure the aircraft from ground movement.

Narrative

The First Officer was flying the approach and the Captain was pilot not flying. When the gear was selected down almost immediately the hydraulic look down light illuminated and the pump was switched off per the memory items. The main accumulator and hydraulic quantity both read zero. The gear indicated down and locked at this point. The emergency checklist was followed and we declared an emergency with the Tower. We then pre-coded with the landing and stopped the aircraft on the runway. CFR was waiting and informed us of a leak around the nosewheel. We informed the Tower we would need to be towed to the gate. We spoke to Dispatch; Operations and Maintenance. We were then towed to the gate for a normal deplaning. We determined a hydraulic line in the nose gear bay ruptured when the landing gear was selected down and we lost all main hydraulic pressure. After landing the ramp personnel arrived at the aircraft to tow us to the gate without chocks and without a working headset. They could hear us but we could not hear them.