B727-200 TURNS OFF RWY ONTO ICY TXWY WITH RESULTING LOSS OF ACFT CTL.

Narrative

AFTER LNDG; BECAUSE OF THE CONDITIONS; I DID NOT LEAN ON THE BRAKES OR USE MAX REVERSE. WHEN I WAS CLOSE TO THE TXWY ENTRANCE I TESTED THE BRAKING REAL GOOD AND RPTED TO THE TWR THE BRAKING WAS FAIR TO GOOD. BUT WHEN I TURNED L OFF THE RWY THE SURFACE WAS ICY. I WOULDN'T HAVE TO GO FAR BEFORE I WOULD HAVE TO TURN L AGAIN SO I TESTED THE BRAKING RIGHT AWAY. I HAD NO BRAKES. THE PLANE WAS JUST SLIDING FORWARD. TO KEEP THE PLANE FROM GOING ONTO THE FIELD I USED REVERSE THRUST. THIS STOPPED MY FORWARD MOVEMENT. THEN THE PLANE JUST SLID 15 FT TO THE R WITH THE R MAIN TIRES OFF THE PAVEMENT. WE JUST SLID OFF THE CROWN OF THE TXWY. I INFORMED THE TWR WHERE I WAS; THEN CALLED OUR MAINT PEOPLE TO BRING A TUG OUT WITH THE TOWBAR. SINCE THE R MAIN WHEELS WOULDN'T ROLL THE PLANE WANTED TO GO R WHEN I ADDED PWR TO MOVE. SO I DIDN'T TRY TO MOVE THE PLANE UNTIL OUR MECH INSPECTED THE AREA BY THE GEAR. THE GND WAS FROZEN SO THE MAINS DID NOT SINK. THE ARPT AUTH SENT A TRUCK OUT TO SAND THE AREA IN FRONT OF THE PLANE AND THE REST OF THE TXWY. WITH THE AID OF THE TUG AND A LITTLE HELP FROM THE 3 RUNNING ENGS THE AIRPLANE MOVED FORWARD BACK ON THE TXWY. END OF PROB. I THOUGHT THE ARPT COULD HAVE BEEN MORE HELPFUL TO INFORM US THAT THE TXWYS WERE ICY. THEY DID NOT. THEY SHOULD HAVE TOLD ME TO GO TO THE END OF THE RWY AND TURN L; BECAUSE THAT AREA WAS SANDED WHEREAS THE AREA I WAS IN WAS NOT SANDED. AFTER ANOTHER B727 LANDED I CALLED HIM AND RECOMMENDED HE NOT USE THE PARALLEL TXWY THAT WAS NEAREST THE RWY. ONLY THE OUTER PARALLEL TXWY WAS SANDED. HE TOOK MY ADVICE! THE SIT WAS UNFORTUNATE BECAUSE THE CITY AND SURROUNDING AREA HAD EXPERIENCED AN ICE STORM THE DAY AND NIGHT BEFORE OUR ARR. WHEN WE LANDED THE TEMPS FINALLY GOT ABOVE FREEZING TO 34 DEGS. THIS WAS A B727.