Newton

While maneuvering during a precautionary landing with the right engine shutdown, the airplane entered a Vmc roll and an uncontrolled descent, and impacted wires, trees, and terrain. According to air traffic control communications, while en route the pilot experienced a rough running right engine and performed a precautionary shutdown of the engine. The pilot elected to divert to an airport and received vectors from air traffic control for a visual approach. Witnesses who were located at the airport reported the airplane was on a normal downwind for the runway. When the airplane reached the approach end of the runway, the pilot turned to the right which was away from the airport. A witness who was monitoring the UNICOM frequency informed the pilot he was turning away from the airport and the pilot responded, "Busy." The airplane continued the right turn subsequently entered a Vmc roll and a rapid descent toward the terrain. The airplane wreckage was located on hilly, rocky terrain approximately 3 miles south of the airport. The airplane was fragmented and destroyed during the impact sequence and post-impact fire. Examination of the airframe and propellers revealed no anomalies that would have precluded normal operations. Examination of the left engine revealed the forward gearbox was destroyed and mechanical continuity of the rotating components and internal mechanisms was established. Examination of the right engine revealed the forward gearbox was destroyed and mechanical continuity of the rotating components and internal mechanisms was established. The reason for the reported rough running engine was not determined. The lifters installed in both engines during the overhauls were not approved lifters for the accident engines.

During a test flight, the airplane encountered an elevator system oscillation while in a high speed dive outside the normal operating envelope. The 17 second oscillation was recorded on the cockpit voice recorder and had an average frequency of 28 Hz. The aft elevator sector clevis (p/n 2331510-32) fractured due to reverse bending fatigue caused by vibration, resulting in a complete loss of elevator control. The flight crew reported that pitch control was established by using horizontal stabilizer pitch trim. The flightcrew stated that during final approach to runway 17 (13,337 feet by 200 feet, dry/asphalt) the aircraft's nose began to drop and that the flying pilot was unable to raise the nose using a combination of horizontal stabilizer trim and engine power. The aircraft landed short of the runway, striking an airport perimeter fence and a berm. The surface winds were from the south at 23 knots, gusting to 32 knots.

The pilot dropped off a passenger at Newton Airport before continuing the flight. The passenger, who was a contract pilot for the company, reported there had been no indications of any problem with the airplane. The pilot conducted a low pass followed by a steep climb to 10,000 feet when he departed Newton. Seven minutes later in the flight, the cockpit voice recorder revealed the pilot stating, 'You're going to pitch up now and take it all the way around here.' The pilot said, 'Pitch up, twenty degrees up.' After the pilot called for the nose to be pitched up, he did not make any statements for about 27 seconds. Then the pilot stated, 'Oh, Jim.' Eight seconds later the airplane impacted the ground. Radar data indicated that airplane's altitude about the time the nose was pitched up was 15,900 feet msl, and it impacted the ground about 37 seconds later. All flight control surfaces were found at the impact site. No maneuver in the pilot's manual or the FAA's Commercial test guide required the nose to be pitched up 20 degrees while maintaining 250 knots. The aircraft was certified as a Transport Category aircraft and was not certified for aerobatic flight.

At 1400 cst, modified Douglas DC-3C/BT-67R, TZ-389, and Beech A36, N3657A, began formation flight to get DC-3 flying time and for the 2nd occupant of the A36 to get aerial photos of the DC-3. A witness saw the airplanes at 500 feet to 700 feet agl, "flying close together heading north." He said "the big plane (DC-3) was flying straight and level. The little plane (A36) was just to the west of the big plane. The little plane then hit the big plane near the middle." After impact, pieces of acft were seen falling. Another witness saw the DC-3 heading north and the A36 circling it above and below. On its last pass, the A36 circled behind the DC-3, then crossed over the top and hitting the top of the DC-3. About 5 seconds after impact, the DC-3 gently rolled/turned westbound (apparently descending and gaining airspeed); the left wing then came off, followed by the right wing about 2 seconds later. Parts of the A36 empennage were found 3590 to 4,910 feet from the main wreckage. There was evidence that during impact, the DC-3 elevator and rudder controls were severed. No preimpact anomalies were found. At 1445 cst, an AIRMET had been issued, forecasting light to moderate turbulence below 8,000 feet msl. Toxicology tests of the DC-3 copilot's blood showed 0.127 mcg/ml amitriptyline (a prescription antidepressant with sedative side effects), 0.039 mcg/ml nortriptyline (metabolite of amitriptyline), and an undetermined amount of ephedrine and phenylpropanolamine (over-the-counter medications used in cold preparations, diet aids and stimulants).

While cruising at an altitude of 7,000 feet, the aircraft collided with a USAF North American B-25J Mitchel registered 44-86870. While the pilot of the Mitchell was able to make an emergency landing, the VC-117B went out of control and crashed in a field located five miles north of Newton. All nine occupants were killed.