RETURN LAND BY DH8 FLC MANDATED BY LOSS OF HYD FLUID IN SYS #2. EMER DECLARED.

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FLT FROM DEN TO JAC. WE WERE ESTABLISHED IN CRUISE FLT CIRCUMNAVIGATING TSTMS WHEN THE CAUTION LIGHT ILLUMINATED. WE PULLED OUT THE QRH; AND DETERMINED THAT WE HAD A SYS LEAK ON THE #2 HYD SYS. BASED ON OUR DISTANCE FROM OUR DEP ARPT AND COMPANY FLT OPS WE DECIDED TO RETURN TO OUR DEP ARPT. WE SPOKE WITH ATC AND RECEIVED OUR PROCS TO DETERMINE WHICH SYS ON THE ACFT WOULD BE EFFECTIVE; AND TRIED TO SPEAK WITH OUR COMPANY DISPATCH ON SELCAL. COMS WERE HAMPERED FROM AN EMER OTHER ACR AIRLINES WAS HAVING; SO WE ESTABLISHED CONTACT WITH OUR COMPANY'S OPS IN DENVER WHICH RELAYED MESSAGES TO OUR DISPATCH. AFTER SPEAKING WITH OUR COMPANY OPS IN DENVER WE DECLARED AN EMER AND PROCEEDED TOWARD DENVER FOR LNDG. FROM HAVING A LOSS OF HYD FLUID ON OUR #2 SYS WE HAD TO DO A MANUAL GEAR EXTENSION. WE RECEIVED OUR CLRNC TO LAND; PROCEEDED WITH THE CHKLIST; AND WE WERE UNABLE TO ESTABLISH A DOWN AND LOCKED INDICATION ON THE NOSEWHEEL GEAR. AT THIS POINT WE BROKE OFF OUR APCH TO LNDG AND RECEIVED VECTORS TO DEPART THE AREA. SHORTLY AFTER THIS; WE RECEIVED A DOWN AND LOCKED INDICATION ON OUR NOSEWHEEL GEAR AND RETURNED BACK TO THE ARPT FOR LNDG. THE LNDG WAS NORMAL. WE TAXIED CLR OF THE RWY AND HAD BUSES DISPATCHED TO THE ACFT TO DEPLANE THE PAX. THERE WERE NO INJURIES; INCIDENTS; OR ACCIDENTS. I FEEL THE CAPT AND MYSELF HANDLED THE EMER WELL. OUR COCKPIT CREW COORD WAS EXERCISED AS THE CAPT CONTINUED TO FLY AND SPEAK WITH ATC AND THE FO PERFORMED OTHER DUTIES TO COMPLY WITH THE EMER AND COMPANY PROCS.