Incident Overview
During a second localizer approach to runway 10, which is 5,004 feet long and 100 feet wide, the aircraft touched down approximately 1,000 feet from the approach end. According to the pilot, the first 1,500 feet after touchdown appeared normal, but upon applying brakes, the aircraft behaved as if on ice, indicating hydroplaning. The pilot attempted pumping the brakes without effect. Noticing an obstruction (localizer antenna) at the end of the runway, the pilot decided to steer right of it, entering the grass.
Sequence of Events
Once in the grass, the aircraft slid sideways to the right, then regained a more positive straight-ahead tracking. It encountered a 3- to 4-foot embankment, became airborne again for a very short period until airspeed dropped, traveled horizontally about 70 feet and vertically 30 feet, then hit the ground, bounced, and slid into the airport security fence, where it came to a stop.
The pilot had previously checked weather at 1815Z (1315 local), reporting a ceiling of 1,200 broken, 5 miles visibility, southeast winds at 10 knots, and light rain. During the initial approach, he experienced strong westerly winds, leading to a higher ground speed and reaching MDA over the runway beginning, prompting a missed approach. For the second approach, the pilot stated he reached MDA about 2.5 miles from the runway, saw the runway at approximately 1 mile, descended, and touched down at the 1,000-foot marker, leaving 4,000 feet of runway.
The pilot reported that after touchdown, the aircraft felt like it was hydroplaning, and he had difficulty keeping the aircraft straight on the grass and maintaining his intended direction. He reported hitting something and then dropping 25 feet before stopping.
Environmental Conditions
Weather reported at 1815Z (prior to first approach): winds from 200 degrees at 6 knots, visibility 3 statute miles. Weather at 1835Z (near the time of the second approach and accident): winds from 310 degrees at 15 knots, gusting to 31 knots, visibility 1.5 statute miles. The pilot noted being in and out of rain showers and moderate turbulence during the approaches.
Post-Accident Findings
During the post-accident inspection, evidence of hydroplaning was found on both main tires.