A GLIDER PLT DSNDING IN AIRWAY AIRSPACE AND OVER AN UNCTLED ARPT OBSERVED AN MD-80 TAKING EVASIVE ACTION.

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I WAS FLYING IN MOUNTAIN WAVE CONDITIONS AT 10800 FT MSL ABOUT 1 MI NE OF FRAZIER LAKE ARPT (1C9). AT XA05 I LEFT THE WAVE AT 10500 FT MSL AND PROCEEDED IN A GENERALLY SW DIRECTION. I WAS MAKING A SERIES OF LINKED STEEP TURNS TO INCREASE RATE OF DSCNT. I PLANNED TO RETURN TO HOLLISTER ARPT (3O7). I WAS AWARE THAT AIRLINE TFC APCHING SAN JOSE WOULD BE PASSING THROUGH THE AREA AT MY ALT; AND THAT I WAS ON OR NEAR AN AIRWAY (V485). I HAD BEEN OBSERVING AIRLINE TFC PASSING ABOUT 5 MI TO THE W OF MY POS FOR THE PAST HR. WHILE COMPLETING A L TURN TOWARD THE SE; I WAS SURPRISED TO SEE AN MD-80 OFF MY L WING ON A RECIPROCAL HDG; ABOUT 1000 YARDS RANGE AND ABOUT 1000 FT BELOW ME. THIS WAS THE FIRST TIME I SAW THE ACFT. IT WAS OBVIOUSLY TAKING EVASIVE ACTION. IT WAS IN A STEEP (45-50 DEG) R DSNDING TURN; AS IT DISAPPEARED UNDER MY WING. I HAD BEEN CONCENTRATING ON LOOKING FOR AIRLINE TFC WHERE I HAD PREVIOUSLY SEEN IT; AND WAS SURPRISED BY THE MD-80 THAT HAD BEEN COMING FROM AN 'UNEXPECTED' DIRECTION -- RIGHT DOWN THE AIRWAY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE SHOULD HAVE GONE FURTHER S AND E WHEN DSNDING OVER THE HOLLISTER ARPT IN ORDER TO AVOID INCOMING TFC TO SAN JOSE ARPT. EVEN THOUGH HE KNOWS THAT IT WAS LEGAL FOR HIM TO BE THERE; IT DID NOT MAKE HIM FEEL GOOD ABOUT THE PAX AND CABIN CREW TO BE SUBJECTED TO THE UNUSUAL ATTITUDE OF THE MD-80 ACFT THAT HE OBSERVED TAKING EVASIVE ACTION. HE STATED THAT HE WILL BE MORE CAREFUL TO AVOID THAT FROM HAPPENING AGAIN. SUPPLEMENTAL INFO FROM ACN 286054: OUR TRANSPORT CATEGORY TURBOJET WAS LEVEL AT 8000 FT MSL ESTABLISHED ON THE SJC LOC AS ASSIGNED. IT WAS MY LEG AS FO AND THE CAPT NOTICED A GLIDER 12 O'CLOCK SLIGHTLY LOWER. I DID NOT SEE THE GLIDER. THEN THE GLIDER PITCHED UP IN AN AEROBATIC MANEUVER RESEMBLING AN IMMELMANN TURN; THAT PUT HIM AT OUR ALT; NOSE-TO-NOSE WITH US. THE CAPT TOOK CTL OF THE ACFT; ROLLED 45 DEGS R AND PITCHED THE NOSE DOWN TO DIVE AWAY FROM THE TFC. HE MUST HAVE SEEN US ALSO; BECAUSE HE TURNED TO THE R AWAY FROM US AS WE PASSED HIM. THE GLIDER WENT BY SO CLOSE ON OUR L WE THOUGHT WE WERE GOING TO HIT. I ADVISED ZOA OF OUR DEV TO AVOID COLLISION. THE GLIDER NEVER SHOWED UP ON TCASII AT ANY TIME.