Narrative:

On final to las in moderate RA, we were informed by tower that another carrier reported 'poor' braking, but all previous reports were 'fair.' I asked for two additional wind checks and confirmed that we were within crosswind limits for poor braking conditions. As we landed, I could see distinct puddle of water at the 25L touchdown zone and extending down the runway and in the relative position of left main gear. The first officer offset about 2 ft right to keep the left wheels out of the puddle. We had 'good to fair' braking. The puddle was continuous, about 3 ft wide, and perfectly aligned with the track of the left main gear. There was no associated problem with the right side of the runway. It is obvious that the crowning of the left (south) half of the runway has become compromised over time. This creates a half hydroplaning problem that needs to be addressed. If no resolution is forthcoming, I recommend that all lndgs in moderate rain be diverted to the remaining 3 runways at las. Callback conversation with reporter revealed the following information: the aircraft landing ahead of the reporter had poor braking action. The aircraft's left main gear was kicking up a noticeable rooster tail. Both pilots noticed the puddling water. The puddling water began about 1000 ft from the end of the runway and continued to their turnoff, off the runway at A6. The flying first officer steered the aircraft to the right side of the runway to avoid the puddling water.

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Original NASA ASRS Text

Title: B737-300 CREW, LNDG IN MODERATE RAIN, FOUND PUDDLING WATER TO THE L OF THE RWY CENTERLINE, ON RWY 25L AT LAS.

Narrative: ON FINAL TO LAS IN MODERATE RA, WE WERE INFORMED BY TWR THAT ANOTHER CARRIER REPORTED 'POOR' BRAKING, BUT ALL PREVIOUS RPTS WERE 'FAIR.' I ASKED FOR TWO ADDITIONAL WIND CHECKS AND CONFIRMED THAT WE WERE WITHIN CROSSWIND LIMITS FOR POOR BRAKING CONDITIONS. AS WE LANDED, I COULD SEE DISTINCT PUDDLE OF WATER AT THE 25L TOUCHDOWN ZONE AND EXTENDING DOWN THE RWY AND IN THE RELATIVE POSITION OF L MAIN GEAR. THE FO OFFSET ABOUT 2 FT R TO KEEP THE L WHEELS OUT OF THE PUDDLE. WE HAD 'GOOD TO FAIR' BRAKING. THE PUDDLE WAS CONTINUOUS, ABOUT 3 FT WIDE, AND PERFECTLY ALIGNED WITH THE TRACK OF THE L MAIN GEAR. THERE WAS NO ASSOCIATED PROBLEM WITH THE R SIDE OF THE RWY. IT IS OBVIOUS THAT THE CROWNING OF THE L (SOUTH) HALF OF THE RWY HAS BECOME COMPROMISED OVER TIME. THIS CREATES A HALF HYDROPLANING PROBLEM THAT NEEDS TO BE ADDRESSED. IF NO RESOLUTION IS FORTHCOMING, I RECOMMEND THAT ALL LNDGS IN MODERATE RAIN BE DIVERTED TO THE REMAINING 3 RWYS AT LAS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE ACFT LNDG AHEAD OF THE RPTR HAD POOR BRAKING ACTION. THE ACFT'S L MAIN GEAR WAS KICKING UP A NOTICEABLE ROOSTER TAIL. BOTH PLTS NOTICED THE PUDDLING WATER. THE PUDDLING WATER BEGAN ABOUT 1000 FT FROM THE END OF THE RWY AND CONTINUED TO THEIR TURNOFF, OFF THE RWY AT A6. THE FLYING FO STEERED THE ACFT TO THE R SIDE OF THE RWY TO AVOID THE PUDDLING WATER.

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.