CORP JET HAS BRAKING NIL; SLIDES OFF RWY. FORCES GAR.

Narrative

TO THE BEST OF MY RECOLLECTION; 2 ACFT LANDED BEFORE I ARRIVED IN HPN WHICH HAD BEEN CLOSED IN ORDER TO PLOW AND SAND THE RWY. THE 1ST ACFT TO LAND AFTER THE ARPT WAS RE- OPENED WAS A GULFSTREAM II THAT RPTED POOR TO FAIR BRAKING ACTION. I DID NOT RECEIVE A RPT FROM THE CREW OF THE NEXT ACFT. THE WIND WAS SHIFTING FROM THE S TO THE W AND RWY 16 WAS IN USE. ON TOUCHDOWN I FELT THE BRAKING ACTION WAS POOR TO NIL. I ELECTED TO SHUT BOTH ENGS DOWN TO HELP SLOW THE ACFT. RUNNING OUT OF RWY WAS NOT A CONCERN TO ME HOWEVER; WITH A XWIND; STAYING ON THE NARROW SANDED STRIP SOMEWHAT WAS. THE ACFT SLOWED TO APPROX 5 MPH WITH APPROX 800 FT OF RWY REMAINING. I STARTED THE R ENG AND THE NOSEWHEEL BEGAN TO SLIDE TO THE L. THERE WAS EFFECTIVELY NO TRACTION AVAILABLE. MOVING VERY SLOWLY STILL; I STARTED THE L ENG IN AN ATTEMPT TO ACHIEVE DIRECTIONAL CTL. I KNEW THAT A LEAR WAS ON FINAL AND I WANTED TO CLR THE RWY SO HE COULD LAND. FROM MY POS; NOW ALMOST STOPPED; THE NOSEWHEEL BECAME HUNG UP AGAINST AN ICE BUILD UP ALONG SIDE OF THE RWY. I WAS UNABLE TO MOVE FORWARD; BACK TO THE CTR OF THE RWY THAT WAS SANDED; THEN EXIT. I ELECTED TO SHUT DOWN AND ADVISE TWR THAT I NEEDED ASSISTANCE TO MOVE THE ACFT. A TOTAL OF 5 PEOPLE PUSHED ON THE LEADING EDGE OF THE L WING IN ORDER TO MOVE THE PLANE BACKWARDS AND THE NOSEWHEEL SLID SIDEWAYS. IT WAS A SKATING RINK ON THE RWY. IT WAS VERY DIFFICULT TRYING TO START THE ENG AS THE NOSE WANTED TO SLIDE. WITH BOTH ENGS RUNNING; I CLRED THE RWY AND TAXIED TO THE RAMP. THE TOTAL DELAY ON THE RWY WAS PROBABLY 6 MINS. I FEEL THE RWY WAS OPENED TOO SOON AND THAT MORE SAND SHOULD HAVE BEEN APPLIED. I SHOULD NOT HAVE CONCERNED MYSELF WITH THE LEAR THAT WAS LNDG. HE HAD TO GAR ANYWAY.