BE58 PLT HAD THE LNDG GEAR FAIL ON LNDG ROLLOUT AT 4M3.

Narrative

THE PURPOSE OF THE FLT WAS TO PROVIDE PROFICIENCY TRAINING ON NEW AVIONICS IN THE ACFT. I WAS NOT FLYING THE ACFT; HOWEVER; I WAS ON THE FLT BECAUSE I AM FAMILIAR WITH THE AVIONICS. THE GPS RWY 9 APCH TO THE CARLISLE ARPT WAS FLOWN WITH A PLANNED CIRCLE TO RWY 27. THE ACFT WAS FLOWN TO THE FINAL APCH FIX; THE GEAR LOWERED AND A NORMAL DSCNT PROFILE WAS FLOWN. THE GEAR INDICATORS WERE VERIFIED GREEN BY BOTH PLTS DURING THE DSCNT; ON DOWNWIND; XWIND; AND ON SHORT FINAL AFTER LOWERING THE FLAPS TO FULL. THE ACFT TOUCHED DOWN WITHIN THE FIRST 500 FT OF THE RWY ON THE MAIN WHEELS FOLLOWED BY THE NOSEWHEEL. THE ROLLOUT APPEARED NORMAL UNTIL THE NOSEWHEEL WENT THROUGH A SMALL PUDDLE OF WATER ON THE RWY (APPROX 1/4 INCH DEP). THIS WAS FOLLOWED BY A NOISE IN THE NOSE OF THE ACFT AND THEN THE NOSEWHEEL COLLAPSED. THE NOSE OF THE ACFT SKIDDED APPROX 50 FT AND THEN THE MAIN GEAR COLLAPSED. THE ACFT SKIDDED TO A STOP APPROX 160 YARDS FROM THE FIRST PROP STRIKE. THERE WAS SOME SMOKE; BUT NO FIRE. NO INJURIES RESULTED FROM THIS INCIDENT.