Pottstown-Limerick-Heritage Field

The air traffic controller, with both ground and local (tower) responsibilities, cleared the accident airplane to land when it was about 8 miles from the runway. Another airplane landed in front of the accident flight, and the controller cleared that pilot to taxi to the hangar. The controller subsequently cleared a tractor with retractable (bat wing) mowers, one on each side, and both in the “up” position, to proceed from the terminal ramp and across the 6,350-foot active runway at an intersection about 2,600 feet from the threshold. The controller then shifted his attention back to the airplane taxiing to its hangar, and did not see the accident airplane land. During the landing rollout, the airplane’s left wing collided with the right side of the tractor when the tractor was “slightly” left of runway centerline. Calculations estimated that the airplane was about 1,000 feet from the collision point when the tractor emerged from the taxiway, and skid marks confirmed that the airplane had been steered to the right to avoid impact. Prior to the crossing attempt, the tractor operator did not scan the runway, and was concentrating on the left side bat wing. Federal Aviation Administration publications do not adequately address the need for ground vehicle operators to visually confirm that active runways/approaches are clear, prior to crossing with air traffic control authorization, thus overlooking an additional means to avoid a collision.

During an attempted takeoff, the airplane collided with a taxiway sign, a fence, a light pole and came to rest between two buildings. According to the pilot in command (seated in the right seat), a preflight and run-up inspection was completed successfully. He stated that a pilot rated passenger (in the left front seat) was following along with a placard checklist. He stated that the airplane was accelerated for takeoff on runway 7, and at 500 feet down the 2700 foot long runway with the airspeed at redline, rotation was initiated and the airplane veered to the right. He stated that shortly thereafter the right engine surged and he noted the matched power levers, but he did not record the engine power instruments. A passenger (seated in a forward facing seat behind the pilot in command) reported that the pilot rated passenger's hand was on the throttle(yellow-knobbed handles) at the time of the accident The reported visibility was 1/8 mile in fog. The prescribed takeoff minimums for that airport is 400 feet and 1 mile visibility. Post accident examination of the engines and their systems revealed no evidence of preimpact mechanical malfunction. The pilot reported that there was no mechanical malfunction.

At 0815 edt, N36444 landed with light snow falling and the temperature above freezing. Snow continued falling and the temperature dropped below freezing. At about 1100, the pilot filed an IFR flight plan and had a lineman brush snow from the wings. The lineman noted that patches of ice remained on the left wing, but the pilot declined to deice the plane. (At an airport 3 miles away, another flight was delayed due to ice that had formed below a snow cover on a plane that sat outside from 0945 to 1100.) The surviving passenger said that after takeoff, N36444 lost lift and yawed left. It appeared to recover, then vibrated, yawed, banked left, descended, and impacted the ground. After the accident, the engines were test run with no notable deficiencies. There was evidence the pilot was taking prescription medication. Tests of his blood showed 0.157 ug/ml of diazepam and 0.134 ug/ml of nordiazepam. Tests of his urine showed 0.152 ug/ml of nordiazepam and 0.167 ug/ml of oxazepam. On 3/2/90, the pilot had surgery for a tumor of (or near) the left optic nerve. In his last FAA medical application, he denied that he had medical treatment in the previous 5 years and did not report use of any medications. The aviation medical examiner had prescribed reserpine (for hypertension) and was aware of the surgery, but this was not reported in the pilot's faa medical record.

Just after liftoff from Pottstown-Limerick Airfield, while in initial climb, one of the engine failed. The pilot lost control of the airplane that stalled and crashed in flames. All five occupants were killed.

En route from Pottstown to Middletown, while cruising at night, the crew encountered poor weather conditions with heavy rain falls. In limited visibility, the airplane impacted the slope of a mountain located 11 km northwest of Fredericksburg. The aircraft was destroyed and all five crew members were killed.