Crash of a Mitsubishi MU-2B-60 Marquise in Sioux Falls: 1 killed

Date & Time: Jun 7, 2020 at 0415 LT
Type of aircraft:
Operator:
Registration:
N44MX
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Everett – Huron
MSN:
1526
YOM:
1981
Flight number:
MDS44
Crew on board:
1
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
1
Circumstances:
The pilot departed Everett-Payne Field in the evening of June 6 on a cargo service to Huron, SD. En route, he was informed about the presence of thunderstorms in the Huron area and decided to divert to Sioux Falls Airport where he landed at 0140LT. Awaiting weather improvement, he left Sioux Falls around 0415LT to resume his flight to Huron. Upon takeoff, the twin engine aircraft crashed in unknown circumstances and was destroyed. The pilot was killed.

Crash of a Cessna 421C Golden Eagle III in Sioux Falls: 4 killed

Date & Time: Dec 9, 2011 at 1424 LT
Type of aircraft:
Operator:
Registration:
N421SY
Flight Phase:
Survivors:
No
Schedule:
Sioux Falls - Rapid City
MSN:
421-0051
YOM:
1975
Crew on board:
1
Crew fatalities:
Pax on board:
3
Pax fatalities:
Other fatalities:
Total fatalities:
4
Captain / Total flying hours:
3848
Captain / Total hours on type:
357.00
Aircraft flight hours:
4882
Circumstances:
Shortly after the airplane lifted off, the tower controller informed the pilot that a plume of smoke was visible behind the airplane. No communications were received from the pilot after he acknowledged the takeoff clearance. Witnesses reported that white smoke appeared to be trailing from the area of the left engine during takeoff. The witnesses subsequently observed flames at the inboard side of the left engine. The airplane began a left turn. As the airplane continued the turn, the flames and trail of white smoke were no longer visible. When the airplane reached a southerly heading, the nose dropped abruptly, and the airplane descended to the ground. Witnesses stated that they heard an increase in engine sound before impact. A postimpact fire ensued. The accident site was located about 3/4 mile from the airport. A postaccident examination determined that the left engine fuel selector and fuel valve were in the OFF position, consistent with the pilot shutting down that engine after takeoff. However, the left engine propeller was not feathered. Extensive damage to the right engine propeller assembly was consistent with that engine producing power at the time of impact. The landing gear and wing flaps were extended at the time of impact. Teardown examinations of both engines did not reveal any anomalies consistent with a loss of engine power. The left engine oil cap was observed to be unsecured at the accident site; however, postaccident comparison of the left and right engine oil caps revealed disproportionate distortion of the left oil cap, likely due to the postimpact fire. As a result, no determination was made regarding the security of left engine oil cap before the accident. Emergency procedures outlined in the pilot’s operating handbook (POH) noted that when securing an engine, the propeller should be feathered. Performance data provided in the POH for single-engine operations were predicated on the propeller of the inoperative engine being feathered, and the wing flaps and landing gear retracted. Thus, the pilot did not follow the emergency procedures outlined in the POH for single-engine operation.
Probable cause:
The pilot’s failure to maintain adequate airspeed after shutting down one engine, which resulted in an inadvertent aerodynamic stall and impact with terrain. Contributing to the accident was the pilot’s failure to follow the guidance contained in the pilot’s operating handbook, which advised feathering the propeller of the secured engine and retracting the flaps and landing gear.
Final Report:

Crash of a Beechcraft Queen Air 80 in North Dakota: 1 killed

Date & Time: Apr 12, 1995 at 0843 LT
Type of aircraft:
Registration:
N7057J
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Sioux Falls-Fargo
MSN:
LD-291
Crew on board:
1
Crew fatalities:
Pax fatalities:
Other fatalities:
Total fatalities:
1
Captain / Total flying hours:
6100
Captain / Total hours on type:
250.00
Aircraft flight hours:
6887

Crash of a Cessna 207 Skywagon near Hardwick: 1 killed

Date & Time: Apr 4, 1988 at 1820 LT
Registration:
N207CA
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Sioux Falls - Crystal
MSN:
207-0097
YOM:
1969
Crew on board:
1
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
1
Captain / Total flying hours:
8000
Captain / Total hours on type:
260.00
Aircraft flight hours:
12000
Circumstances:
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.
Probable cause:
Occurrence #1: in flight collision with terrain/water
Phase of operation: maneuvering
Findings
1. (c) maneuver - improper - pilot in command
2. (c) aircraft control - not maintained - pilot in command
3. (f) physical impairment - pilot in command
4. Object - tree(s)
5. Object - building(nonresidential)
6. Object - vehicle
Final Report: