Pennsylvania

The pilot was conducting an approach to runway 8, during which the left wing contacted the ground approximately 75 feet from the approach end of the runway. The airplane came to rest about 160 feet down the runway, and off the right side. A pilot who landed on runway 26, about 30 minutes prior to the accident flight, stated that the winds were out of the northwest at 15 knots with gusts, and he experienced plus and minus 10 knots on the airspeed while on final approach. The winds 19 miles to the east, at 1045 eastern standard time, were reported from 310 degrees at 15 knots with gusts up to 20 knots. An AIRMET was issued at 0345, with an advisory for occasional moderate turbulence below 8,000 feet. The AIRMET was reissued at 0945, with the added advisory of, 'Low level wind shear potential over the Boston Area Forecast area east of an Erie-Bristol line due to gusty northwesterly surface winds. Conditions ending by 1600.' An FAA Inspector examined the wreckage and found no preimpact anomalies with the airplane.

The flight was on the ILS approach to runway 6, broke out of the clouds at 500 feet, and then re-entered the clouds. The airplane had not yet touched down when it drifted to right of the runway centerline and struck a snow bank located in the grass to the right of the runway, between the runway and the taxiway. The pilot stated he was just starting the missed approach when the accident occurred, and '...that there was no indication of a malfunction of the aircraft.' The reported ceiling was, 100 sky obscured, and the visibility was 1/4 mile, wind 040 degrees, 6 knots.

The aircraft crashed while maneuvering to land at Pittsburgh International Airport, Pittsburgh, Pennsylvania. Flight 427 was operating under the provisions of 14 Code of Federal Regulations Part 121 as a scheduled domestic passenger flight from Chicago-O'Hare International Airport, Chicago, Illinois, to Pittsburgh. The flight departed about 1810, with 2 pilots, 3 flight attendants, and 127 passengers on board. The airplane entered an uncontrolled descent and impacted terrain near Aliquippa, Pennsylvania, about 6 miles northwest of the destination airport. All 132 people on board were killed, and the airplane was destroyed by impact forces and fire. Visual meteorological conditions prevailed for the flight, which operated on an instrument flight rules flight plan.

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.

The airplane was observed by witnesses in a rolling maneuver, followed by the separation of the left wing and collision with trees. Witnesses stated that the pilot had performed acrobatics in this airplane on other occasions. The airplane flight manual prohibits intentional acrobatics. No evidence of corrosion or fatigue in the wing spar or support structures was observed.

While cruising at FL240, the pilot observed the engine oil pressure gradually decrease from the normal to the caution range and a drop in manifold pressure. He requested and received vectors for a precautionary landing at an airport short of his destination. During the descent, the oil pressure continued to drop to zero and engine power was lost. He was able to locate the airport underneath the overcast, but loss of engine power prevented him from reaching the runway. The airplane impacted trees 1,200 feet from the airport. The 6 engine cylinder assemblies were changed 7 hours prior to the accident. Examination of the engine and turbochargers did not reveal the source of the oil loss.

The instrument rated pilot was en route to pick up cargo. He received three preflight weather briefings earlier that indicated snow, mountain obscuration, and low visibility. He reported, 'seeing the lights of university,' and requested a contact approach. He also said that if he could not get in, he would make an ils approach. When the airplane was 4 miles south of the airport, the New York air traffic controller cleared the pilot for a contact approach to runway 24. A witness reported hearing a low flying airplane. He stated that it was snowing heavily and he saw the tail light of an airplane briefly through the snow. He also reported that a snow squall was in the area at the time. Shortly afterward, he heard what was later determined to be the sound of the collision. Search personnel located the wreckage 3.3 miles south of the airport on top of mount nittany which was about 2000 feet high. The pilot, sole on board, was killed.

During the takeoff ground run, witnesses observed the airplane at a slow speed, using the full length of the 4,102-ft runway before it became airborne briefly. The left wing dipped, struck some power lines, and the airplane crashed on a highway striking a car. Metallurgical teardown examinations of the two left engine turbochargers disclosed evidence of extreme wear in the bearings from the turbine wheel shafts which resulted in obstructed oil ports. Both occupants were injured.

Piper Aerostar 601, N3645D, was arriving as Bell 412 (helicopter), N78S, was departing. N3645D reported the aircraft's nose gear indicator light did not illuminate to verify the nose gear was down and locked. Crew of N78S heard the communication and saw N3645D as they crossed beneath N3645D's approach path. They reported N3546D's nose gear appeared to be extended. N3645D flew past the tower and tower personnel also reported the nose gear appeared to be extended. As N3645D was cleared to turn downwind, N78S offered to join for a closer look. Captain of N3645D accepted the offer. During joinup, N78S converged from left rear, then reported they would pass around the right side and look at everything as they went by. They reported that everything looked ok. Moments later, the two aircrafts collided and crashed to the ground. No mechanical reason was found that would have resulted in the accident. None of the pilots had training for flight in close proximity to another aircraft. There were indications the captain of N3645D lacked training in aircraft systems and that his employer (the operator) lacked surveillance by the FAA. The emergency procedure section of the Aerostar flight manual lacked info on emergency gear extension. All three occupants were killed as well as both pilots on board the helicopter. Four other people on the ground were injured, one seriously.

The flight was from Monongahela to Pittsburgh to Teterboro, NJ, then return to Pittsburgh and back to Monongahela. The flight departed Monongahela with 100 gallons of fuel; 160 gallons were added at Pittsburgh; and 80 gallons were added at Teterboro. The pilot wanted to add more fuel at Teterboro but the owner did not due to the higher cost of fuel and the fuel gage indications. During the return trip no fuel was added at Pittsburgh because the pilot did not have a credit card provided by the owner or money to buy fuel. The flight experienced a two-engine power loss due to fuel exhaustion while approaching the Monongahela Airport. Subsequent examination of the cockpit fuel gages showed a total of 125 gallons in the left tank and 90 gallons in the right tank; the reading remained the same with or without power.