Crash of a Curtiss C-46F-1-CU Commando near Des Moines: 2 killed

Date & Time: May 22, 1953 at 0413 LT
Type of aircraft:
Operator:
Registration:
N1669M
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
New York – Cheyenne – Chicago
MSN:
22536
YOM:
1945
Location:
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
2
Captain / Total flying hours:
8106
Captain / Total hours on type:
3622.00
Copilot / Total flying hours:
2593
Copilot / Total hours on type:
393
Aircraft flight hours:
6867
Circumstances:
The aircraft arrived at Cheyenne, Wyoming at 0038, May 22, on a Civil Air Movement flight (military contract) from New York International Airport. The incoming pilots had no mechanical or radio discrepancies to report. After the aircraft was serviced, Captain Bowen F. Marshall and Copilot Samuel B. Aronson relieved the incoming crew for the purpose of ferrying the aircraft to Chicago, at which point, the pilots were to turn it over to another crew. Both pilots visited the U. S. Weather Bureau Airport Station at Cheyenne for weather briefing; all current weather information through 2330 (including three severe weather warnings) was on file and available to them. The aircraft departed Cheyenne at 0132, on an instrument flight plan to O’Hare Airport, Chicago, via Green Airway 3 and Red Airway 42 at 7,000 feet. Neither passengers nor cargo was carried and the center of gravity was within permissible limits. Routine position reports were made over Sidney, North Platte, Grand Island, and Omaha, Nebraska. In the last position report, at 0337, the flight reported to Omaha INSAC (Interstate Airways Communication Station) that it was over Omaha at 7,000 feet, estimating over Des Moines at Ohio. Three minutes later, the pilot again contacted Omaha INSAC and requested a change of altitude to 3,000 feet. Air Route Traffic Control, through Omaha INSAC, advised the flight that the 3,000-foot altitude was unavailable until arrival over Des Moines owing to a westbound flight proceeding at 2,600 feet between Des Moines and Omaha, and the request for descent would have to be disapproved. The flight was given the latest weather information between Omaha and Chicago, and the Des Moines 0327 weather, and there were no further radio contacts after this. Des Moines tower personnel received a telephone call at 0517 notifying them of the crash. The aircraft was destroyed and both pilots were killed.
Probable cause:
The Board determines that the probable cause of this accident was separation of the right aileron tab motor from its support bracket due to loss of its outboard trunnion while the aircraft was an the severe turbulence of a thunderstorm. These conditions resulted in a tendency to roll erratically, and an conjunction with the extreme turbulence, caused loss of control and subsequent overloading of the wing to the point of failure. The following findings were pointed out:
- The pilots had knowledge of expected weather conditions between Cheyenne and Chicago, including severe thunderstorms,
- The aircraft flew into a severe thunderstorm in the vicinity of Des Moines, and structural failure occurred In flight,
- Prior to impact the outboard trunnion supporting the right aileron tab motor backed out of the airport bracket due to inadequate safetying,
- The right aileron tab motor tore loose from its bracket, punched through the wing, and was lost when the aileron tore loose,
- The right wing panel failed at the attach angles to the center section due to a strong downward force which exceeded the design strength of the wing,
- The tall group was struck by the right wing panel prior to the tail disintegration,
- All radio contacts were routine and no declaration of emergency was received from the flight,
- There was no malfunctioning or failure of the engines or propellers.
Final Report:

Crash of a Douglas DC-3A in Sioux City: 16 killed

Date & Time: Mar 2, 1951 at 0912 LT
Type of aircraft:
Operator:
Registration:
N19928
Survivors:
Yes
Schedule:
Kansas City – Omaha – Sioux City – Minneapolis
MSN:
7400
YOM:
1942
Flight number:
MD016
Location:
Crew on board:
4
Crew fatalities:
Pax on board:
21
Pax fatalities:
Other fatalities:
Total fatalities:
16
Captain / Total flying hours:
8585
Captain / Total hours on type:
6971.00
Copilot / Total flying hours:
3695
Copilot / Total hours on type:
1445
Aircraft flight hours:
28202
Circumstances:
Flight 16 departed Kansas City, Missouri, at 0724LT, bound for Omaha, Nebraska, Sioux City, Iowa, and other intermediate stops with final destination as Minneapolis, Minnesota. The crew consisted of Captain James H. Graham, First Officer Philip K. Toler, and Stewardess Marilyn Woodbury. Ernest F. Eilert, a trainee copilot, was riding in the cockpit as the fourth crew member. From Kansas City, the aircraft carried 21 passengers, cargo, and fuel, which resulted in a total gross weight of 25,100 pounds, which was within the certificated unit of 25,200 pounds The load was properly distributed with relation to the center of gravity of the aircraft. Weather conditions over the intended route were instrument with a general overcast lowering from 4,200 feet at Kansas City to about 1,000 feet at Omaha. No difficulty was experienced as the flight proceeded to Omaha at 4,000 feet in accordance with an instrument flight plan. A normal landing was made on Runway 11 about 1,000 feet from its approach end, but near the completion of the landing roll the aircraft ran off the right side of the runway, passing over one of the high intensity runway lights. Captain Graham reported this to one of the ground crew at Omaha, and both the aircraft and light were inspected for damage. None was found and the aircraft was prepared for departure to Sioux City. At 0841 the flight took off for Sioux City on an instrument flight plan with Omaha as the alternate airport. There were 21 passengers, 920 pounds of cargo, and 1,500 pounds of fuel, which resulted in a take-off weight of 24,630 pounds. The take-off was without incident and no difficulty was encountered en route to Sioux City, the flight proceeding at 3,000 feet altitude. At 0904 Flight 16 reported over the Sloan Fan Marker, 11.9 miles south-southeast of the approach end of Runway 35 at the Sioux City Airport. It was immediately cleared by the Sioux City Airport tower for a “straight-in” approach and landing on Runway 35. Weather information was furnished to the flight as precipitation, ceiling 500 feet, sky obscured, visibility one mile in light snow showers, and wind from the east at 14 miles per hour. The medium-intensity lights for Runway 17/35 were turned on and placed at the position of full brilliance. Following receipt of this information, the flight requested permission to land to the southeast on Runway 13 and received clearance to do so. At 0909 the flight reported that it was contact over the southeast corner of the field and was cleared to land. At the same time the aircraft was seen by a ground witness one mile southeast of the airport. Shortly thereafter, it was sighted approximately over the intersection of Runways 4/22 and 17/35 on an east-southeast heading. A left climbing turned to the north was then made and the pilot was advised that he was cleared to land on either Runway 17 or Runway 13. The pilot was also advised by the tower that there would be a 90-degree cross-wind if he elected to land on Runway 17. All transmissions to the flight were acknowledged The aircraft was not further observed, and crashed about 600 feet north and west of the approach end of Runway 17. Fire developed immediately. Three crew members and 13 passengers were killed while nine other occupants were seriously injured. The aircraft was destroyed by fire.
Probable cause:
The Board determines that the probable cause of this accident was a stall during a left turn too close to the ground to effect recovery.
Final Report:

Crash of a North American TB-25J-25-NC Mitchell near Iowa City: 3 killed

Date & Time: Feb 10, 1951
Operator:
Registration:
44-30389
Flight Phase:
Flight Type:
Survivors:
Yes
MSN:
108-33664
Location:
Crew on board:
6
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
3
Circumstances:
The aircraft exploded and crashed in a field located near a farm, about 4 miles southwest of Iowa City. Three crew members who were able to bail out survived while three other occupants were killed. The crew was performing a flight from Lone Tree to Ogden-Hill AFB, Utah.

Crash of a Douglas C-39 in Sioux City: 3 killed

Date & Time: Jan 31, 1944 at 0032 LT
Type of aircraft:
Operator:
Registration:
38-501
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Sioux City - Saint Joseph
MSN:
2059
YOM:
1939
Location:
Crew on board:
3
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
3
Circumstances:
The aircraft left Sioux City Airport at 0028LT bound for the Saint Joseph-Rosecrans Airport, Missouri. While climbing, the twin engine aircraft went out of control and crashed 14 km from its departure point. The aircraft was destroyed and all three crewmen were killed.
Probable cause:
Loss of control caused by the explosion of the right engine (number 2) during initial climb.

Crash of a Douglas C-47A-35-DL in Rock Falls: 5 killed

Date & Time: Aug 2, 1943 at 1240 LT
Operator:
Registration:
42-23957
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Fort Wayne - Hamilton
MSN:
9819
YOM:
1943
Location:
Crew on board:
5
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
5
Circumstances:
The crew was performing a cargo flight from Fort Wayne, Indiana, to the air base of Hamilton located near San Rafael, California. En route, the aircraft went into a low pressure area with thunderstorm activity and turbulence. Shortly later, the right wing broke off at its root, fell away and hit the rudder that was sheared off as well. Out of control, the aircraft dove into the ground and crashed half a mile west of Rock Falls, killing all five crew members.
Crew:
2nd Lt Suren Melkonian,
2nd Lt Leon Andrew Place,
Sgt Alfred W. Quinlan,
S/Sgt John E. Quinn,
2nd Lt Robert G. Randtke.
Probable cause:
The failure of the right wing in flight was caused by turbulence that exceeded the design limit of the wing structure. At the time of the accident, the total weight of the aircraft was in excess of more than one ton, which could be considered as a contributory factor.

Crash of a Douglas C-33 near Winterset

Date & Time: Dec 23, 1941
Type of aircraft:
Operator:
Registration:
36-79
Flight Phase:
Flight Type:
Survivors:
Yes
MSN:
1512
YOM:
1936
Location:
Crew on board:
0
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
Following an engine failure in flight, the crew bailed out and abandoned the airplane that dove into the ground and crashed near Winterset. There were no injuries among the crew.
Crew:
Charles W. Himes.
Probable cause:
Engine failure in flight.

Crash of a Stinson Model R in Aredale: 5 killed

Date & Time: Jun 12, 1940
Type of aircraft:
Registration:
NC10876
Flight Phase:
Flight Type:
Survivors:
No
MSN:
8516
YOM:
1931
Location:
Crew on board:
1
Crew fatalities:
Pax on board:
4
Pax fatalities:
Other fatalities:
Total fatalities:
5
Circumstances:
After takeoff, while climbing to a height of 150 feet, the pilot initiated a sharp turn when the airplane stalled and crashed in a field. All five occupants were killed. The pilot was not licensed to carry passengers.

Crash of a Ryan B-1 Brougham in Saint Ansgar: 5 killed

Date & Time: Jul 4, 1934 at 1700 LT
Type of aircraft:
Operator:
Registration:
NC6586
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Waterloo - Waterloo
MSN:
128
YOM:
1928
Crew on board:
1
Crew fatalities:
Pax on board:
4
Pax fatalities:
Other fatalities:
Total fatalities:
5
Circumstances:
The single engine airplane departed Waterloo Airport on a local pleasance flight, carrying four passengers and one pilot. En route, one wing failed. The airplane dove into the ground and crashed in Saint Ansgar. All five occupants were killed.
Probable cause:
Loss of control following a wing failure in flight.

Crash of a Boeing 40B-4 in McClelland

Date & Time: Dec 13, 1932 at 0600 LT
Type of aircraft:
Operator:
Registration:
NC842M
Flight Phase:
Flight Type:
Survivors:
Yes
Schedule:
Chicago – Omaha
MSN:
1168
YOM:
1929
Location:
Crew on board:
1
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
While on a night mail flight from Chicago to Omaha, the pilot encountered an unexpected situation. He reduced his altitude and attempted an emergency landing when the aircraft crashed and came to rest upside down, bursting into flames. The pilot was uninjured and the aircraft was destroyed.

Crash of a Travel Air 5000 in Davenport

Date & Time: Jan 30, 1929 at 1815 LT
Type of aircraft:
Operator:
Registration:
NC769
Flight Phase:
Flight Type:
Survivors:
Yes
Schedule:
Kansas City – Moline
MSN:
176A
YOM:
1927
Location:
Crew on board:
1
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
En route from Kansas City to Moline, while approaching Davenport, weather conditions deteriorate with heavy snow falls and icing conditions. The pilot lost his orientation and decided to bail out. He abandoned the airplane that entered a dive and crashed in a field. The aircraft was destroyed and the pilot John 'Jack' Barton was uninjured.