EMB-120 Captain reported the loss of a hydraulic system while transitioning from climb to cruise flight. The crew manually extended the gear; conducted a flyby of the tower to verify the gear was down; and made a no flap landing at the destination airport.

Narrative

During transition from climb to cruise the crew observed a master caution for the Hydraulics system; caution was for a low fluid level in the left side or 'green' hydraulic reservoir. After monitoring for about 10 seconds the fluid level dropped to the bottom of the gauge and shortly thereafter the crew observed multiple warnings for loss of hydraulic pressure. At this point the crew conducted a loss of 'green' system QRH. Due to the loss of this system the crew determined it would have to perform a manual gear extension; and a no flap landing with reduced braking as well as loss of nose wheel steering. Upon this determination the crew contacted ATC and requested direct ZZZ as well as a low approach to confirm gear extension after the manual extension had been achieved. Approximately 20 miles from the field crew conducted a manual extension of the landing gear according to the QRH. Following gear extension the crew was cleared for a low approach down Runway XXL in order to allow the tower to confirm gear extension. After confirmation Tower vectored us around for a visual approach with crews standing by. Landing was conducted according to SOP and crew was able to exit the runway on Taxiway 1 and stop just outside the FBO ramp. Crew shutdown aircraft and allowed emergency services to inspect exterior as maintenance personnel towed the airplane to its parking spot on the ramp.