Narrative:

The moderate rain began to slow down, but turbulence remained moderate. As we continued in the pattern the PIC was announcing to unicom of our position. As the aircraft became established on downwind I called, 'gear down and before landing checklist.' the PIC called, '3 green no red!' PIC further called, 'vref will be 100 KTS.' I replied, 'vref 100 KTS set.' I turned base leg and called, 'flaps 20 degrees.' PIC complied. I then turned final and called for 'full flaps.' PIC called 'flaps 30 degrees, 3 green no red, airspeed looks good.' on final we experienced some windshear +/-10 KTS. We both agreed to keep in a little extra speed because of the shear. Coming over the trees before the way threshold, PIC comments, 'good job it looks good!' the airplane touched down onto the first 1/3 of the runway. As soon as the mains touched, I added gradual brake pressure and the PIC extended the speed brakes. Immediately, we both realized that airplane was not slowing down. The PIC asked, 'are you braking?!' I replied, 'yes!' I then tried to pump the brakes, but to no avail. The PIC tried his brakes and was also unsuccessful. The runway was covered in water and we both realized that aircraft was hydroplaning the braking was absolute nil! I maintained directional control (straight forward) while PIC secured the aircraft as we prepared for the inevitable -- the aircraft rolling off the end of the runway. The aircraft did roll into an empty field, about 150 ft from the end of the runway. We shut down the electrical power and exited the airplane. Later, the airplane was towed back to the ramp. Upon further inspection, there was no evidence of any damage to the airplane. Further, no persons were harmed or injured and no property damaged. The first contributing factor was a flooded runway with a poor drainage system. Second, the aircraft is not equipped with reversers. What we could have done to prevent this was not to have landed on this runway at this airport with those conditions. I learned a lot from this experience and feel fortunate that no one was injured. More than ever, I am aware of the effects that water has on an airplane -- during landing and any other operation while on the ground.

Google
 

Original NASA ASRS Text

Title: FO OF A MU300 DIAMOND FAILED TO STOP ACFT DURING LNDG ON A RWY WITH STANDING WATER AT AN UNCTLED ARPT AND HYDROPLANED OFF THE END OF THE RWY INTO A FIELD. THE ACFT WAS STRANDED, BUT THERE WAS NO DAMAGE TO THE ACFT.

Narrative: THE MODERATE RAIN BEGAN TO SLOW DOWN, BUT TURB REMAINED MODERATE. AS WE CONTINUED IN THE PATTERN THE PIC WAS ANNOUNCING TO UNICOM OF OUR POS. AS THE ACFT BECAME ESTABLISHED ON DOWNWIND I CALLED, 'GEAR DOWN AND BEFORE LNDG CHKLIST.' THE PIC CALLED, '3 GREEN NO RED!' PIC FURTHER CALLED, 'VREF WILL BE 100 KTS.' I REPLIED, 'VREF 100 KTS SET.' I TURNED BASE LEG AND CALLED, 'FLAPS 20 DEGS.' PIC COMPLIED. I THEN TURNED FINAL AND CALLED FOR 'FULL FLAPS.' PIC CALLED 'FLAPS 30 DEGS, 3 GREEN NO RED, AIRSPD LOOKS GOOD.' ON FINAL WE EXPERIENCED SOME WINDSHEAR +/-10 KTS. WE BOTH AGREED TO KEEP IN A LITTLE EXTRA SPD BECAUSE OF THE SHEAR. COMING OVER THE TREES BEFORE THE WAY THRESHOLD, PIC COMMENTS, 'GOOD JOB IT LOOKS GOOD!' THE AIRPLANE TOUCHED DOWN ONTO THE FIRST 1/3 OF THE RWY. AS SOON AS THE MAINS TOUCHED, I ADDED GRADUAL BRAKE PRESSURE AND THE PIC EXTENDED THE SPD BRAKES. IMMEDIATELY, WE BOTH REALIZED THAT AIRPLANE WAS NOT SLOWING DOWN. THE PIC ASKED, 'ARE YOU BRAKING?!' I REPLIED, 'YES!' I THEN TRIED TO PUMP THE BRAKES, BUT TO NO AVAIL. THE PIC TRIED HIS BRAKES AND WAS ALSO UNSUCCESSFUL. THE RWY WAS COVERED IN WATER AND WE BOTH REALIZED THAT ACFT WAS HYDROPLANING THE BRAKING WAS ABSOLUTE NIL! I MAINTAINED DIRECTIONAL CTL (STRAIGHT FORWARD) WHILE PIC SECURED THE ACFT AS WE PREPARED FOR THE INEVITABLE -- THE ACFT ROLLING OFF THE END OF THE RWY. THE ACFT DID ROLL INTO AN EMPTY FIELD, ABOUT 150 FT FROM THE END OF THE RWY. WE SHUT DOWN THE ELECTRICAL PWR AND EXITED THE AIRPLANE. LATER, THE AIRPLANE WAS TOWED BACK TO THE RAMP. UPON FURTHER INSPECTION, THERE WAS NO EVIDENCE OF ANY DAMAGE TO THE AIRPLANE. FURTHER, NO PERSONS WERE HARMED OR INJURED AND NO PROPERTY DAMAGED. THE FIRST CONTRIBUTING FACTOR WAS A FLOODED RWY WITH A POOR DRAINAGE SYS. SECOND, THE ACFT IS NOT EQUIPPED WITH REVERSERS. WHAT WE COULD HAVE DONE TO PREVENT THIS WAS NOT TO HAVE LANDED ON THIS RWY AT THIS ARPT WITH THOSE CONDITIONS. I LEARNED A LOT FROM THIS EXPERIENCE AND FEEL FORTUNATE THAT NO ONE WAS INJURED. MORE THAN EVER, I AM AWARE OF THE EFFECTS THAT WATER HAS ON AN AIRPLANE -- DURING LNDG AND ANY OTHER OP WHILE ON THE GND.

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.