Narrative:

We were on vectors to an ILS runway 17. Approach changed the runway to runway 29 at last min because of rain showers in the area. I thought the WX would not affect our approach to runway 17, looking at the radar. I did not mention this, even though runway 29 was only 7200 ft long and wet. I flew a good approach, on GS and airspeed. Our speed was high, because our weight was close to maximum landing weight. We briefed medium autobrakes and to dip below GS to use all the runway. I did not dip below GS until decision ht, 200 ft AGL. When I did dip, it was not as low as I wanted crossing threshold at 50 ft AGL. It was a smooth landing. The autobrakes did not seem to grab. Captain came on the brakes. When he saw the 3000 ft remaining marker we both came on the brakes all the way and I increased reverse thrust. The brakes were still not effective. We reached taxi speed with about 150 ft to go. Lessons learned: when I thought about not using runway 29, I should have verbalized that. Making a firm landing may have prevented the hydroplane. I believe that without the 3000 ft remaining marker we would have reacted slower and gone off the end of the runway. They should be on all runways!!

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Original NASA ASRS Text

Title: LGT ACFT HYDROPLANES AFTER TOUCHDOWN ON WET RWY. STOPS JUST 150 FT FROM END OF RWY.

Narrative: WE WERE ON VECTORS TO AN ILS RWY 17. APCH CHANGED THE RWY TO RWY 29 AT LAST MIN BECAUSE OF RAIN SHOWERS IN THE AREA. I THOUGHT THE WX WOULD NOT AFFECT OUR APCH TO RWY 17, LOOKING AT THE RADAR. I DID NOT MENTION THIS, EVEN THOUGH RWY 29 WAS ONLY 7200 FT LONG AND WET. I FLEW A GOOD APCH, ON GS AND AIRSPD. OUR SPD WAS HIGH, BECAUSE OUR WT WAS CLOSE TO MAX LNDG WT. WE BRIEFED MEDIUM AUTOBRAKES AND TO DIP BELOW GS TO USE ALL THE RWY. I DID NOT DIP BELOW GS UNTIL DECISION HT, 200 FT AGL. WHEN I DID DIP, IT WAS NOT AS LOW AS I WANTED XING THRESHOLD AT 50 FT AGL. IT WAS A SMOOTH LNDG. THE AUTOBRAKES DID NOT SEEM TO GRAB. CAPT CAME ON THE BRAKES. WHEN HE SAW THE 3000 FT REMAINING MARKER WE BOTH CAME ON THE BRAKES ALL THE WAY AND I INCREASED REVERSE THRUST. THE BRAKES WERE STILL NOT EFFECTIVE. WE REACHED TAXI SPD WITH ABOUT 150 FT TO GO. LESSONS LEARNED: WHEN I THOUGHT ABOUT NOT USING RWY 29, I SHOULD HAVE VERBALIZED THAT. MAKING A FIRM LNDG MAY HAVE PREVENTED THE HYDROPLANE. I BELIEVE THAT WITHOUT THE 3000 FT REMAINING MARKER WE WOULD HAVE REACTED SLOWER AND GONE OFF THE END OF THE RWY. THEY SHOULD BE ON ALL RWYS!!

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.