At about 1035 eastern time, a Piper PA-28-235 crashed into trees after losing engine power while on approach to Chester County Airport. The pilot was seriously injured. The pilot had flown from the Chicago area, destined for Coatesville, and was about one mile out from runway 11 when the engine lost power. The pilot attempted to make a downwind landing to runway 29 but crashed a half-mile short. An inspector determined the airplane had run out of fuel.