United Airlines Trip 4
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United Airlines Trip 4
United Air Lines Trip 4 was a Boeing 247D operating on a scheduled flight from Salt Lake City, Utah, to Cheyenne, Wyoming, on October 7, 1935. The aircraft last contacted Cheyenne at 02:16 or 02:17, reporting its position as Silver Crown. Cheyenne called the flight at 02:21, receiving no reply. The weather was virtually clear with ceiling unlimited. The wreckage was located 3 mi (4.8 km) east of Silver Crown. The aircraft struck the ground in a shallow descent just below a small knoll. Marks on the ground made by the propellers, fuselage, and engine showed the aircraft was in a normal flight attitude. Propeller marks and engine damage established the engines were developing normal power and the aircraft was at cruising speed. An untouched knoll 60 ft (18 m) further back on the flight path and 3 ft (0.9 m) higher established that the aircraft was descending. The pilot was believed to be flying on instruments. The probable cause was determined to be pilot error in failing ...
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Controlled Flight Into Terrain
In aviation, a controlled flight into terrain (CFIT; usually ) is an aviation accidents and incidents, accident in which an airworthy aircraft, under aircraft pilot, pilot control, is unintentionally flown into the ground, a mountain, a body of water or an obstacle. In a typical CFIT scenario, the aircrew, crew is unaware of the impending disaster until it is too late. The term was coined by engineers at Boeing in the late 1970s. Accidents where the aircraft is out of control at the time of impact, because of mechanical failure or pilot error, are not considered CFIT (they are known as ''uncontrolled flight into terrain'' or ''UFIT''), nor are incidents resulting from the deliberate action of the person at the controls, such as acts of terrorism or suicide by pilot. According to Boeing in 1997, CFIT was a leading cause of airplane accidents involving the loss of life, causing over 9,000 deaths since the beginning of the commercial jet aircraft. CFIT was identified as a cause of ...
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Pilot Error
Pilot error generally refers to an Aviation accidents and incidents, accident in which an action or decision made by the Aircraft pilot#Airline, pilot was the cause or a contributing factor that led to the accident, but also includes the pilot's failure to make a correct decision or take proper action. Errors are intentional actions that fail to achieve their intended outcomes. Chicago Convention on International Civil Aviation, Chicago Convention defines accident as "An occurrence associated with the operation of an aircraft [...] in which [...] a person is fatally or seriously injured [...] ''except when the injuries are [...] inflicted by other persons."'' Hence the definition of the "pilot error" does not include deliberate crash (and such crash is not an accident). The causes of pilot error include psychological and physiological human limitations. Various forms of threat and error management have been implemented into pilot training programs to teach crew members how t ...
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Laramie County, Wyoming
Laramie County is a county located at the southeast corner of the U.S. state, state of Wyoming. As of the 2020 United States Census, the population was 100,512 or 17.4% of the state's total 2020 population, making it the List of counties in Wyoming, most populous county in Wyoming, but the least populous county in the United States to be the List of the most populous counties by U.S. state, most populous in its state. The county seat is Cheyenne, Wyoming, Cheyenne, the state capital. The county lies west of the Nebraska state line and north of the Colorado state line. Laramie County comprises the Cheyenne metropolitan area, Cheyenne, WY Metropolitan Statistical Area. The city of Laramie, Wyoming, is in neighboring Albany County, Wyoming, Albany County. History Laramie County was originally created in 1867 as a county within the Dakota Territory. The county was named for Jacques La Ramee, a French-Canadian fur-trader. In 1867, a portion of Laramie County was annexed to create ...
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Salt Lake City
Salt Lake City (often shortened to Salt Lake and abbreviated as SLC) is the Capital (political), capital and List of cities and towns in Utah, most populous city of Utah, United States. It is the county seat, seat of Salt Lake County, Utah, Salt Lake County, the most populous county in Utah. With a population of 200,133 in 2020, the city is the core of the Salt Lake City metropolitan area, which had a population of 1,257,936 at the 2020 census. Salt Lake City is further situated within a larger metropolis known as the Salt Lake City–Provo–Orem Combined Statistical Area, Salt Lake City–Ogden–Provo Combined Statistical Area, a corridor of contiguous urban and suburban development stretched along a segment of the Wasatch Front, comprising a population of 2,746,164 (as of 2021 estimates), making it the 22nd largest in the nation. It is also the central core of the larger of only two major urban areas located within the Great Basin (the other being Reno, Nevada). Salt Lake C ...
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Utah
Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to its west by Nevada. Utah also touches a corner of New Mexico in the southeast. Of the fifty U.S. states, Utah is the 13th-largest by area; with a population over three million, it is the 30th-most-populous and 11th-least-densely populated. Urban development is mostly concentrated in two areas: the Wasatch Front in the north-central part of the state, which is home to roughly two-thirds of the population and includes the capital city, Salt Lake City; and Washington County in the southwest, with more than 180,000 residents. Most of the western half of Utah lies in the Great Basin. Utah has been inhabited for thousands of years by various indigenous groups such as the ancient Puebloans, Navajo and Ute. The Spanish were the first Europe ...
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Cheyenne, Wyoming
Cheyenne ( or ) is the capital and most populous city of the U.S. state of Wyoming, as well as the county seat of Laramie County, with 65,132 residents, per the 2020 US Census. It is the principal city of the Cheyenne metropolitan statistical area which encompasses all of Laramie County and had 100,512 residents as of the 2020 census. Local residents named the town for the Cheyenne Native American people in 1867 when it was founded in the Dakota Territory. Cheyenne is the northern terminus of the extensive Southern Rocky Mountain Front, which extends southward to Albuquerque, New Mexico, and includes the fast-growing Front Range Urban Corridor. Cheyenne is situated on Crow Creek and Dry Creek. History At a celebration on July 4, 1867, Grenville M. Dodge of the Union Pacific Railroad announced the selection of a townsite for its mountain region headquarters adjacent to the bridge the railroad planned to build across Crow Creek in the Territory of Dakota. At the sa ...
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Boeing 247
The Boeing Model 247 is an early United States airliner, and one of the first such aircraft to incorporate advances such as all-metal (Anodizing#Anodized aluminium, anodized aluminum) semimonocoque construction, a fully Cantilever#Aircraft, cantilevered wing, and Landing gear, retractable landing gear."Model 247 Commercial Transport."
''boeing.com,'' 2009. Retrieved: June 14, 2010.
Other advanced features included control surface trim tabs, an autopilot and deicing boot, de-icing boots for the wings and tailplane. The 247 first flew on February 8, 1933, and entered service later that year.Gould 1995, p. 14.


Design and development


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United Airlines
United Airlines, Inc. (commonly referred to as United), is a major American airline headquartered at the Willis Tower in Chicago, Illinois.Destinations Served
. United Airlines Official Statistics.
United operates a large domestic and international route network spanning cities large and small across the United States and all six inhabited continents. Measured by fleet size and the number of routes, it is the third-largest airline in the world after its merger with Continental Airlines in 2010. United has eight hubs, with
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1934 United Airlines Boeing 247 Crash
The 1934 United Air Lines Boeing 247 crash was an accident involving a Boeing Air Transport-operated United Airlines scheduled flight of a Boeing 247, which crashed in bad weather shortly after departing Salt Lake City, Utah, on February 23, 1934, killing all eight on board. The cause was not immediately determined, but poor weather was considered a factor. History of flight At 14:00 on Friday, February 23, 1934, United Airlines Boeing 247, NC13357, c/n 1739, departed Salt Lake City, Utah, bound for Cheyenne, Wyoming. The weather was poor, with snow and sleet throughout the region, with up to of snow accumulating in the lowlands and even more at higher altitudes.Associated Press, "Eight Aboard Plane Feared Dead as Day Of Search Is Futile - Blizzard Cripples Search as Air Liner's Fate Unknown but Survival Doubtful", ''The San Bernardino Daily Sun'', San Bernardino, California, Sunday 25 February 1934, Volume 40, page 1. "The last word received by radio from the ill-fated plane w ...
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CFIT
In aviation, a controlled flight into terrain (CFIT; usually ) is an accident in which an airworthy aircraft, under pilot control, is unintentionally flown into the ground, a mountain, a body of water or an obstacle. In a typical CFIT scenario, the crew is unaware of the impending disaster until it is too late. The term was coined by engineers at Boeing in the late 1970s. Accidents where the aircraft is out of control at the time of impact, because of mechanical failure or pilot error, are not considered CFIT (they are known as ''uncontrolled flight into terrain'' or ''UFIT''), nor are incidents resulting from the deliberate action of the person at the controls, such as acts of terrorism or suicide by pilot. According to Boeing in 1997, CFIT was a leading cause of airplane accidents involving the loss of life, causing over 9,000 deaths since the beginning of the commercial jet aircraft. CFIT was identified as a cause of 25% of USAF Class A mishaps between 1993 and 2002. Accordi ...
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Airliner Accidents And Incidents In Wyoming
An airliner is a type of aircraft for transporting passengers and air cargo. Such aircraft are most often operated by airlines. Although the definition of an airliner can vary from country to country, an airliner is typically defined as an airplane intended for carrying multiple passengers or cargo in commercial service. The largest of them are wide-body jets which are also called twin-aisle because they generally have two separate aisles running from the front to the back of the passenger cabin. These are usually used for long-haul flights between airline hubs and major cities. A smaller, more common class of airliners is the narrow-body or single-aisle. These are generally used for short to medium-distance flights with fewer passengers than their wide-body counterparts. Regional airliners typically seat fewer than 100 passengers and may be powered by turbofans or turboprops. These airliners are the non- mainline counterparts to the larger aircraft operated by the major carri ...
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Aviation Accidents And Incidents In The United States In 1935
Aviation includes the activities surrounding mechanical flight and the aircraft industry. ''Aircraft'' includes fixed-wing and rotary-wing types, morphable wings, wing-less lifting bodies, as well as lighter-than-air craft such as hot air balloons and airships. Aviation began in the 18th century with the development of the hot air balloon, an apparatus capable of atmospheric displacement through buoyancy. Some of the most significant advancements in aviation technology came with the controlled gliding flying of Otto Lilienthal in 1896; then a large step in significance came with the construction of the first powered airplane by the Wright brothers in the early 1900s. Since that time, aviation has been technologically revolutionized by the introduction of the jet which permitted a major form of transport throughout the world. Etymology The word ''aviation'' was coined by the French writer and former naval officer Gabriel La Landelle in 1863. He derived the term fro ...
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