United States of America

While en route on a night IFR cargo flight, the pilot requested and was cleared for a descent from an IFR cruise altitude of 16,000 feet to proceed VFR-on-top. The last transmission from the aircraft was at 2106 when the pilot acknowledged that he was familiar with the terrain along the route. At 2121:51 mdt, radar contact was lost after the aircraft made an approximately 360° left turn and descended thru 13,800 feet. Shortly after that, the controller tried to call the pilot to inform him that radar contact was lost, but was unable to make radio contact. Later, wreckage of the aircraft was found where it had crashed about 2 miles southwest of were radar contact was lost. The wreckage was scattered over an area of more than one mile. An investigation revealed the left wing and right horizontal stabilizer had separated upward from overload. No pre-accident fatigue or part failure/malfunction was found. Weather reports and pireps indicated moderate turbulences and towering cumulus clouds in the area. Approximately 60 miles west at Pocatello, ID, snow showers were reported; 2 to 3 inches of snow fell on the wreckage overnight. Both pilots were killed.

The flight departed Buffalo under IFR conditions to Jamestown, New York. Several approaches were made to land but due to the weather conditions, the pilot elected to return to Buffalo still under IFR. During initial contact with control tower, the pilot advised them that he was low on fuel and requested direct flight to Buffalo. About 5 miles south-southwest of Buffalo both engines quit and the pilot advised that he was not going to make it. At this time the flight was issued emergency vector to Buffalo, but the aircraft crashed adjacent to route 400 in West Seneca, New York.

Witnesses observed the aircraft for approximately 8 minutes in erratic diving, climbing, and steep-turning maneuvers which culminated in a 12° descent to the ground. The sound of the engine was heard throughout the sequence and other evidence indicated engine power at impact. The aircraft struck trees, a farm building, farm equipment, and a vehicle, then burst into flames. The wreckage was strewn along a 320 feet path. No evidence of flight control malfunction was found. The pilot claimed an upset stomach before the flight. The pilot's speech was slurred in radio transmissions. The pilot did not respond to the last radio call from Sioux Falls tower. No emergency or distress calls were received from the pilot. The postmortem examination of the pilot did not identify specific impairment but was limited due to the severity of the impact and fire damage.

Before the accident, witnesses observed the aircraft circling in a valley beneath a low cloud layer and below the surrounding hilltops. They estimated the ceiling was 400 feet obscured. Two witnesses said the aircraft entered clouds before it crashed. A 3rd witness, who was a pilot, said the aircraft was at a very low altitude when it approached rising/mountainous terrain; he said the aircraft then entered a steep climbing turn and stalled after making two complete turns. Impact occurred in a nose low, left wing down attitude. No preimpact mechanical problem was found. The FAA had issued the pilot a special 3rd class medical certificate after he had quintuple heart bypass surgery. He was reported to have gotten 'quite angry' before the flight, when 2 passengers were late. A pathologist believed the pilot's death may have been due to arteriosclerotic heart disease; however, this was not verified. The pilot did not have an instrument rating and no record of a preflight weather briefing was found. All five occupants were killed.

The cargo flight departed Cincinnati en route to Wichita, KS with an intermediate stop at Kansas City Downtown Airport. The flight progressed normally to a VOR runway 03 instrument approach, circling to runway 01. The pic had been cleared to commence the approach. Tower personnel subsequently advised the pic of a low altitude alert, to which the pic responded he had ground contact. The pic subsequently declared a missed approach, then said, 'I got it all right,' and he requested a 360° turn and landing on runway 01. Witnesses observed the aircraft approach from the west at a low altitude. Then, while over airport property, the aircraft turned sharply. The left wing dropped quickly as the aircraft banked nearly 90°. The aircraft impacted the ramp area 400 feet right of runway 01, in front of a fixed base operator and burst into flames. The aircraft slid about 200 feet before coming to a stop. The company chief pilot stated that the pic was deficient in VOR approaches. The pilot, sole on board, was killed.

The pilot and one passenger were on a business trip in the US from canada. The pilot had the aircraft fuel tanks 'topped off' prior to departure from Kansas City. The flight plan indicated 3 hours 30 min enroute to Albuquerque with 5 hours 30 min of fuel on board. Strong enroute winds and turbulence were forecast along the route of flight. The actual flight was 4.4 hrs. The aircraft crashed while turning from base leg to final at the Albuquerque Intl Airport. Examination of the wreckage revealed no evidence of fuel in or around the aircraft. The manufacturer recommends using the main tanks for 90 minutes before switching to any aux tank to prevent venting of return fuel overboard. Vented fuel will diminish fuel supply. Both occupants were killed.

The copilot was flying the aircraft as it was being ferried after minor maintenance. As they were in a descent and were approaching the destination airport, the captain noted a left engine torque fluctuation of 20% to 30% and elected to secure the engine, although no yawing was noticed. During shutdown, the left propeller did not feather and drag increased until the aircraft would not sustain level flight. An attempted restart of the left engine was unsuccessful, so the captain tried to feather it again. However, the left propeller still did not feather. Subsequently, the pilots were forced to land in an open field on uneven terrain and the aircraft was damaged. An extensive investigation was made, but no cause could be found for the torque fluctuation, nor could the condition be duplicated, however, the investigation did note that the air and ground procedures for engine shutdown were similar. A variation in the ground shutdown procedures allowed for engagement of the start latches.

The flight was an air taxi cargo flight carrying truck parts. After takeoff, the tower asked the pilot if he was in difficulty and the pilot replied 'roger' and requested a change of flight plan. The aircraft was seen flying erratically just above the tree tops. The aircraft descended almost vertically into a residential area. The rear of one home was ignited by the impact and 2 occupants of the house were fatally burned. Post accident investigation revealed no engine malfunction but there were discrepancies in the load manifest and the aircraft weight and balance. Before takeoff a company employee watched the pilot secure the cargo with ropes nets and clips but did not help because he 'didn't know what the pilot was doing. 'Impact' damage precluded determination of the original placement and security of the cargo and any possible shifting prior to impact. The net weight on the cargo manifest did not include the weight of the trays to hold the parts. This was an omission of 150 lbs. Company personnel said no weight and balance information was left with them when the aircraft departed.

The pilot received a weather briefing before starting a night cargo operation in known icing conditions. Before the flight, a line serviceman noticed ice on the aircraft's wings and suggested its removal, but the pilot declined. Approximately 45 minutes after takeoff, the pilot reported to ARTCC that a de-ice boot had 'blown' and he was having difficulty controlling the aircraft. He said the boot was 'going back and forth' and that full right aileron was required to keep the wings level. Also, he reported a continuous loss of altitude and said that full right aileron would not keep the aircraft from turning to the left. Subsequently, the aircraft crashed on descending terrain while in a slightly nose down, left wing low attitude. Much of the aircraft (including much of the left wing) was demolished by impact and fire. Prop slash marks indicated the engines were providing power. Maintenance records had no information of replacement, repair or modification of the de-ice boots in the previous 10 years. The pilot's wife indicated he had previously been pressured to fly aircraft with discrepancies. Sigmets golf 3 and 4 warned of occasional severe mixed icing in clouds and precipitations. Both occupants were killed.

The aircraft disappeared from radar at approximately 1 mile final on a night ILS runway 13 approach. Radar data indicated that the aircraft completed almost 180° of turn prior to disappearing. The aircraft crashed in a heavily wooded area. No evidence of a preexisting failure on the engines or airframe was found. When the flying history of the pilot was examined, the hours presented on his resume exceeded his log book and his log book hours could not be totally verified. The copilot did not have an instrument rating. The pilot that preceded the accident aircraft on the approach said he experienced moderate turbulence, windshear and that the approach lights were very distracting. The pilot had received a weather briefing which included wind shear and moderate turbulence. All three occupants were killed.