C650 CREW FLEW A NUMBER OF LEGS WITH A HYD LEAK THAT WAS NOT REPAIRED. THE CREW FLEW OVER 250 KTS BELOW 10000 FT; BECAUSE THEY WERE UNABLE TO DEPLOY THE SPD BRAKES.

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DURING THE FLT FROM BELLINGHAM; WA; IT WAS NOTED THAT THERE WAS AN INCREASED LOSS OF HYD FLUID. THERE HAD BEEN A PREVIOUS NOTE OF A SMALL HYD LEAK AND AFTER CONSULTING WITH MAINT; THE ADVICE WAS TO TRY TO DETERMINE WHERE THE LEAK WAS OCCURRING. UPON ARR IN VANCOUVER; CANADA; THE R GEAR WELL WAS CHKED AND 2 FITTINGS WERE FOUND TO BE LOOSE. AFTER TIGHTENING THE FITTINGS; THE SYS WAS SVCED WITH FLUID AND RELEASED. OP OF ALL SYS WERE NORMAL; BUT A SLIGHT LOSS OF FLUID WAS NOTED ON THE LEG TO BELLINGHAM; WA. DURING THE FLT TO SACRAMENTO; THE FLUID LOSS BECAME MORE EVIDENT. UPON ARR AT SACRAMENTO; THE FLUID LEVEL WAS ABOVE THE EMER LEVEL. AS THE HYD LOW LEVEL LIGHT CAME ON; THE AUX HYD PUMP WAS SELECTED 'ON;' AND WAS NOTED TO CAVITATE TO INDICATE AIR IN THE SYS. EVERY EFFORT WAS FOCUSED ON GETTING ON THE GND AS QUICKLY AND SAFELY AS POSSIBLE. WITH THE LIMITED FLUID ABOVE THE RED LINE; ALL SYS WOULD BE NORMAL. DURING THE DSCNT; SPD BRAKES WERE NOT AN OPTION; AS THAT WOULD COST VALUABLE FLUID; AND AS A RESULT; IT WAS NOTED THAT THE INDICATED AIRSPD WAS IN EXCESS OF 250 KIAS; BUT THIS ACTION WAS NOT INTENTIONAL. THE COPLT RPTED 280 KTS; HOWEVER; 265 KTS WAS OBSERVED AND WAS CORRECTED IMMEDIATELY. BY DSNDING WITHOUT ADDED HYD FLUID LOSS; THE END RESULT WAS ALL NEEDED FUNCTIONS WORKED AND NO EMER OCCURRED. THE AUX HYD PUMP CONTINUED TO CAVITATE ON ROLLOUT; THEREFORE; SPD BRAKES; THRUST REVERSER; NORMAL GEAR OPS; AND NORMAL BRAKING WOULD NOT HAVE BEEN AVAILABLE. FAILURE TO HAVE ABSOLUTE CTL OF SPD WAS A PROB; HOWEVER; CTL OF THE SIT WAS CRITICAL.