What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
As reported by PIC: on the rollout shortly after touchdown, the aircraft travelled through standing water on and to the left of the center line of the runway. The crew felt a bump as if the aircraft went over a dip or pothole on the runway. During the after landing check, the flaps failed at 15 degrees and could not be reset. After shutting down, the crew discovered substantial damage to the left inboard flap panel caused by the water from the left main landing gear hitting the underside of the flap panel.
The aircraft had touched down approximately 1000? Down the runway and on centerline. The standing water was encountered about 1500? From the threshold (between taxiways d and e) at a speed of approximately 90-100 knots.
The incident was discussed with the dot airport maintenance person on duty. He stated that the dip in the runway was a known issue and had been notamed and that other aircraft had also been damaged in the past. He later determined that the NOTAM had been cancelled the previous day and was not available to us the day of arrival. Airport maintenance personnel would usually sweep the standing water out of the dip after rainfall, but due to our time of arrival this had not yet been done. Airfield fss and maintenance were open at 0700 local time. He also stated that ?local? Crews knew about the issue and would land right of the center line to avoid the dip. He drove us out to the runway to observe the standing water. We estimated the water to be 2 to 3 inches deep in some spots.
Comment from investigating inspector: according to NTSB, since the damage was limited to the flap, the damage was "minor" therefore classified as an incident.
As the FAA filed it
AS REPORTED BY PIC: ON THE ROLLOUT SHORTLY AFTER TOUCHDOWN, THE AIRCRAFT TRAVELLED THROUGH STANDING WATER ON AND TO THE LEFT OF THE CENTER LINE OF THE RUNWAY. THE CREW FELT A BUMP AS IF THE AIRCRAFT WENT OVER A DIP OR POTHOLE ON THE RUNWAY. DURING THE AFTER LANDING CHECK, THE FLAPS FAILED AT 15 DEGREES AND COULD NOT BE RESET. AFTER SHUTTING DOWN, THE CREW DISCOVERED SUBSTANTIAL DAMAGE TO THE LEFT INBOARD FLAP PANEL CAUSED BY THE WATER FROM THE LEFT MAIN LANDING GEAR HITTING THE UNDERSIDE OF THE FLAP PANEL.
THE AIRCRAFT HAD TOUCHED DOWN APPROXIMATELY 1000? DOWN THE RUNWAY AND ON CENTERLINE. THE STANDING WATER WAS ENCOUNTERED ABOUT 1500? FROM THE THRESHOLD (BETWEEN TAXIWAYS D AND E) AT A SPEED OF APPROXIMATELY 90-100 KNOTS.
THE INCIDENT WAS DISCUSSED WITH THE DOT AIRPORT MAINTENANCE PERSON ON DUTY. HE STATED THAT THE DIP IN THE RUNWAY WAS A KNOWN ISSUE AND HAD BEEN NOTAMED AND THAT OTHER AIRCRAFT HAD ALSO BEEN DAMAGED IN THE PAST. HE LATER DETERMINED THAT THE NOTAM HAD BEEN CANCELLED THE PREVIOUS DAY AND WAS NOT AVAILABLE TO US THE DAY OF ARRIVAL. AIRPORT MAINTENANCE PERSONNEL WOULD USUALLY SWEEP THE STANDING WATER OUT OF THE DIP AFTER RAINFALL, BUT DUE TO OUR TIME OF ARRIVAL THIS HAD NOT YET BEEN DONE. AIRFIELD FSS AND MAINTENANCE WERE OPEN AT 0700 LOCAL TIME. HE ALSO STATED THAT ?LOCAL? CREWS KNEW ABOUT THE ISSUE AND WOULD LAND RIGHT OF THE CENTER LINE TO AVOID THE DIP. HE DROVE US OUT TO THE RUNWAY TO OBSERVE THE STANDING WATER. WE ESTIMATED THE WATER TO BE 2 TO 3 INCHES DEEP IN SOME SPOTS.
COMMENT FROM INVESTIGATING INSPECTOR: ACCORDING TO NTSB, SINCE THE DAMAGE WAS LIMITED TO THE FLAP, THE DAMAGE WAS "MINOR" THEREFORE CLASSIFIED AS AN INCIDENT.