A B727 CREW; AFTER LNDG AT DSM; WERE UNABLE TO MAKE THEIR PLANNED TURN AT RWY END; COMING TO A STOP WITH THE R MAIN AND NOSE GEAR OFF THE HARD SURFACE.

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ON APR/TUE/02; I WAS FLYING ACFT X INTO DES MOINES; IA. THE WX AT THE TIME OF LNDG WAS MODERATE RAIN; APPROX 4-5 MI VISIBILITY; AND 1000 FT CEILING. I COMMENCED AN ILS APCH TO RWY 13 AND LANDED WITHOUT ANY PROBS IN THE TOUCHDOWN ZONE AT XA15Z. I WAS INSTRUCTED TO TAKE ANY L TXWY OFF THE RWY TO GO TO S CARGO WHERE WE PARK. SINCE THE CARGO AREA IS AT THE END OF RWY 13; I DECIDED TO ROLL TO THE END OF TXWY D1. I SLOWED TO TAXI SPD WELL PRIOR TO THE END OF THE RWY. I STARTED TO APPLY BRAKES AND TURN THE TILLER TO MAKE A L TURN. I NOTICED THE PLANE WAS NOT TURNING AND WAS SLIDING -- LIKE I WAS ON A SKATING RINK (VERY SLICK). SINCE BRAKING WAS NOT SLOWING US DOWN; I USED REVERSE THRUST; WHICH DIDN'T HELP EITHER. JUST PRIOR TO ROLLING OFF THE RWY; THE PLANE DID START TO TURN L; BUT THERE WAS NOT ENOUGH HARD SURFACE TO STOP. THE PLANE PARTIALLY ROLLED INTO THE GRASS AS THE L MAIN GEAR STAYED ON THE HARD SURFACE. THE END OF THE RWY WAS RECENTLY PAINTED. WHILE THE RWY APPEARED WET; THERE WAS NO STANDING WATER; AND IT CAUSED THIS AREA TO BE SLICK; WITH ABSOLUTELY NO BRAKING ACTION. I REQUESTED THE ARPT AUTH DO A BRAKING TEST; BUT THEY REFUSED. THEY ALSO REFUSED TO ALLOW ACR X MECHS TO GO ON THE RWY TO LOOK AT THE AREA IN QUESTION. THE DAMAGE TO THE ARPT INCLUDED 1 RED REIL; AND 2 BLUE TAXI LIGHTS TO THE S PORTION OF TXWY D1. DAMAGE TO THE AIRPLANE CONSISTED OF CUTS IN BOTH THE R MAIN TIRES AND 1 NOSE TIRE. NUMEROUS PEOPLE WITNESSED THIS EVENT; NOTING HOW SLOW I WAS ROLLING; THE FRONT GEAR TURNING WITH NO RESULTS; AND HEARING THE ENGS GOING INTO REVERSE; ALL TRYING TO STOP THE ACFT; BUT WITH NO EFFECT. WE WERE PULLED FROM THE GRASS AREA AND TOWED TO THE GATE -- BRAKES WERE SET AT XD00Z. THIS ALL OCCURRED AFTER THE FLT PORTION WAS COMPLETED. I HEARD FROM OUR GND HANDLER THAT THE PAINT WAS EXPERIMENTAL. IT WAS STRIPPED OFF THE ARPT WITHIN 24 HRS OF THE INCIDENT. SUPPLEMENTAL INFO FROM ACN 546412: THE CAPT AND I WERE JUMP SEATING OUT THE FOLLOWING NIGHT. WE TAXIED OVER THE SAME AREA YET AGAIN. IT WAS OBVIOUS TO ALL OF US ON BOARD THAT SOMEONE HAD SCUFFED UP THE SAME PAINTED AREA THAT WE HAD INQUIRED ABOUT ON THE MORNING OF 04/TUE/02. FOR THE RECORD; I WOULD LIKE TO MENTION THAT I FLEW CONTINUOUSLY WITH CAPT X FOR 3 1/2 WKS PRIOR TO THE INCIDENT. NOT ONCE DURING THAT TIME DID I WITNESS HIM TAXI AT EXCESSIVE SPDS OR EXHIBIT UNSAFE PRACTICES. ON THE CONTRARY; BEING A NEW CAPT; HE TENDED TO BE SOMEWHAT CONSERVATIVE IN HIS PROCS. CALLBACK CONVERSATION WITH RPTR ACN 546361 REVEALED THE FOLLOWING INFO: RPTR HAS HEARD NO FURTHER WORD FROM HIS COMPANY WITH REGARD TO THE STATUS OF THE INVESTIGATION. CALLBACK CONVERSATION WITH AN INSPECTOR FROM THE LCL FLT SAFETY OFFICE REVEALED THE FOLLOWING INFO: THE INCIDENT IS BEING LOOKED INTO. NO INFO WAS FORTHCOMING WITH REGARD TO THE EXPERIMENTAL PAINT ISSUE.