Narrative:

Aircraft landing and rollout phase normal. ATC requested us to 'take it to the end and turn left, we have an aircraft on 3 mi final.' we then brought the power up on 2 engines approximately 2200 ft from the end of runway 8L. All of a sudden 60 KTS showed on the airspeed indicator and I called out 60 KTS, the captain said 'ok.' he also responded with the power to idle and maximum braking. (Reverse thrust was not selected). The aircraft departed the left side and end of runway 8L approximately 70 ft off the end of the runway. No damage to aircraft (returned to serve 6 hours later). No damage to airport facilities. No injuries to crew or dead heading passenger. Conclusion: captain later stated he was pulling on the 'levers' for all he was worth - then realized when we stopped he had the throttles not the reversers. Even now our experience with this type aircraft we still feel the sight picture we had approaching the end was sufficient to stop the aircraft. Aircraft: no maintenance problems found with pertinent system. Cause: possible misjudgement of speed for the prevailing conditions or hydroplaning or both. Supplemental information from acn 296878: there was no braking actions noted on the ATIS or NOTAMS. The end of the runway had tire residue from landing aircraft, combined with rain from the previous hour had made the braking action nil.

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Original NASA ASRS Text

Title: AFTER LNDG ACFT DEPARTED END OF RWY, EXCESSIVE SPD, INSUFFICIENT BRAKING AND NO REVERSE THRUST.

Narrative: ACFT LNDG AND ROLLOUT PHASE NORMAL. ATC REQUESTED US TO 'TAKE IT TO THE END AND TURN LEFT, WE HAVE AN ACFT ON 3 MI FINAL.' WE THEN BROUGHT THE PWR UP ON 2 ENGS APPROX 2200 FT FROM THE END OF RWY 8L. ALL OF A SUDDEN 60 KTS SHOWED ON THE AIRSPD INDICATOR AND I CALLED OUT 60 KTS, THE CAPT SAID 'OK.' HE ALSO RESPONDED WITH THE PWR TO IDLE AND MAX BRAKING. (REVERSE THRUST WAS NOT SELECTED). THE ACFT DEPARTED THE L SIDE AND END OF RWY 8L APPROX 70 FT OFF THE END OF THE RWY. NO DAMAGE TO ACFT (RETURNED TO SERVE 6 HRS LATER). NO DAMAGE TO ARPT FACILITIES. NO INJURIES TO CREW OR DEAD HDG PAX. CONCLUSION: CAPT LATER STATED HE WAS PULLING ON THE 'LEVERS' FOR ALL HE WAS WORTH - THEN REALIZED WHEN WE STOPPED HE HAD THE THROTTLES NOT THE REVERSERS. EVEN NOW OUR EXPERIENCE WITH THIS TYPE ACFT WE STILL FEEL THE SIGHT PICTURE WE HAD APCHING THE END WAS SUFFICIENT TO STOP THE ACFT. ACFT: NO MAINT PROBS FOUND WITH PERTINENT SYS. CAUSE: POSSIBLE MISJUDGEMENT OF SPD FOR THE PREVAILING CONDITIONS OR HYDROPLANING OR BOTH. SUPPLEMENTAL INFO FROM ACN 296878: THERE WAS NO BRAKING ACTIONS NOTED ON THE ATIS OR NOTAMS. THE END OF THE RWY HAD TIRE RESIDUE FROM LNDG ACFT, COMBINED WITH RAIN FROM THE PREVIOUS HR HAD MADE THE BRAKING ACTION NIL.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.