LTT ACFT WENT OFF END OF RWY AFTER LNDG PARTLY DUE TO STANDING WATER AND ANTI-SKID BRAKE RELEASES. NO DAMAGE.

Narrative

WX AT BIV WAS RPTED: WIND 150 DEGS AT 09 KTS; VISIBILITY 4 MI AND LIGHT RAIN; CEILING OVCST AT 600 FT; TEMP 17 DEGS C; DEWPOINT 17 DEGS; ALTIMETER 30.07; REMARKS CEILING VARIABLE 400-900 FT. WX WAS RECEIVED WHILE VECTORED FOR ILS RWY 26 AT BIV. THE SIC WAS THE PF. THE APCH WAS NORMAL AND TOUCHDOWN OCCURRED WITHIN THE FIRST 1000 FT OF RWY. AIR BRAKES AND THRUST REVERSERS WERE DEPLOYED. BRAKING WAS GOOD UNTIL MOMENTS LATER WHEN THE ANTI-SKID BRAKES RENDERED NO BRAKING. THE ACFT AT THIS TIME WAS TOO SLOW TO EXECUTE A GAR. THEN; THE BRAKES WERE INTERMITTENT AND IT APPEARED THE ACFT WOULD STOP. WITH 1000 FT OF RWY LEFT 'BRAKES 1' ONCE AGAIN HAD NO EFFECT AND 'BRAKES 2' WERE SELECTED SLOWING THE ACFT. HOWEVER; THE ACFT HAD NOT SLOWED ENOUGH TO MAKE THE 90 DEG TURN AT THE END OF THE RWY AND RAN OFF THE R SIDE LESS THAN 25 FT INTO THE GRASS AND ENDING ON THE RUN-UP PAD. AFTER DEBRIEFING WE DROVE OUT AND OBSERVED STANDING WATER ON THE RWY LEADING US TO BELIEVE THIS EVENT TOOK PLACE DUE TO HYDROPLANING; HOWEVER; TO BE SURE THE BRAKES HAD NOT MALFUNCTIONED I IMMEDIATELY RPTED THIS TO MY COMPANY. THE DIRECTOR OF MAINT AND THE MAINT SHIFT SUPVR OF MY COMPANY INSPECTED THE BRAKES AND CONCLUDED THEY HAD NOT MALFUNCTIONED RETURNING THE ACFT TO SVC. THE SIC FLYING THE ACFT HAS MORE THAN 300 HRS IN TYPE AND HAS ALWAYS SHOWN PROFESSIONAL PERFORMANCE OF SKILL AND KNOWLEDGE. THE SIC HAD MORE THAN 50 HRS OF FLT TIME IN THIS PARTICULAR ACFT AND MYSELF; THE PIC; HAD 2 HRS PRIOR TO THIS FLT. BALANCE FIELD LENGTH AND LNDG DISTANCES WERE CALCULATED BEFORE DEP SHOWING THE ACFT WAS ABLE TO STOP WITH 1000 FT OF RWY REMAINING. I BELIEVE THE CREW OF THIS FLT FOLLOWED PROCS ACCORDINGLY AND I COMMEND THE SIC FOR HIS PERFORMANCE.