The Westland Welkin was a British twin-engine heavy fighter from the Westland Aircraft Company, designed to fight at extremely high altitudes, in the stratosphere; the word welkin meaning "the vault of heaven" or the upper atmosphere. First conceived in 1940, the plane was built in response to the arrival of modified Junkers Ju 86P bombers flying reconnaissance missions that suggested the Luftwaffe might attempt to re-open the bombing of England from high altitude. Construction was from 1942 to 1943. The threat never materialised; consequently, Westland produced only a small number of Welkins and few of these flew.
The Boeing Model 247 is an early American airliner, and one of the first such aircraft to incorporate advances such as all-metal semimonocoque construction, a fully cantilevered wing, and retractable landing gear. Other advanced features included control surface trim tabs, an autopilot and de-icing boots for the wings and tailplane. The 247 first flew on February 8, 1933, and entered service later that year.
The Douglas DC-7 is an American transport aircraft built by the Douglas Aircraft Company from 1953 to 1958. A derivative of the DC-6, it was the last major piston engine-powered transport made by Douglas, being developed shortly after the earliest jet airliner—the de Havilland Comet—entered service and only a few years before the jet-powered Douglas DC-8 first flew in 1958. Unlike other aircraft in Douglas's line of propeller-driven aircraft, no examples remain in service in the present day, as compared to the far more successful DC-3 and DC-6.
Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine's thrust for it to act against the forward travel of the aircraft, providing deceleration. Thrust reverser systems are featured on many jet aircraft to help slow down just after touch-down, reducing wear on the brakes and enabling shorter landing distances. Such devices affect the aircraft significantly and are considered important for safe operations by airlines. There have been accidents involving thrust reversal systems, including fatal ones.
The Cessna 441 Conquest II is the first turboprop powered aircraft designed by Cessna, and was meant to fill the gap between their jets and piston-engined aircraft. It was developed in November 1974, with the first aircraft delivered in September 1977. It is a pressurized, 8–9 passenger turbine development of the Cessna 404 Titan.
Cheyenne Regional Airport is a civil-military airport a mile north of downtown Cheyenne, in Laramie County, Wyoming. It is owned by the Cheyenne Regional Airport Board.
The Lockheed AH-56 Cheyenne was an attack helicopter developed by Lockheed for the United States Army. It rose from the Army's Advanced Aerial Fire Support System (AAFSS) program to field the service's first dedicated attack helicopter. Lockheed designed the Cheyenne using a four-blade rigid-rotor system and configured the aircraft as a compound helicopter with low-mounted wings and a tail-mounted thrusting propeller driven by a General Electric T64 turboshaft engine. The Cheyenne was to have a high-speed dash capability to provide armed escort for the Army's transport helicopters, such as the Bell UH-1 Iroquois.
The Piper PA-31 Navajo is a family of twin-engined utility aircraft designed and built by Piper Aircraft for small cargo and feeder airlines, and as a corporate aircraft. Production ran from 1967 to 1984. It was license-built in a number of Latin American countries.
Aircraft upset is a dangerous condition in aircraft operations in which the aircraft flight attitude or airspeed is outside the normal bounds of operation for which it is designed. This may result in the loss of control (LOC) of the aircraft, and sometimes the total loss of the aircraft itself. Loss of control may be due to excessive altitude for the airplane's weight, turbulent weather, pilot disorientation, or a system failure.
Pan American World Airways Flight 202 was a Boeing 377 Stratocruiser aircraft that crashed in the Amazon Basin about 281 nautical miles southwest of Carolina, Brazil on April 29, 1952. The accident happened en route from Rio de Janeiro, Brazil, to Port of Spain, Trinidad and Tobago, during the third leg of a four-leg journey. All 50 people on board were killed in the deadliest-ever accident involving the Boeing 377.
Alliance Air Flight 7412 was a scheduled Indian domestic passenger flight from Calcutta to Delhi, operated by Indian regional airliner Alliance Air. On 17 July 2000, while on approach to its first stopover in Patna, the Boeing 737-2A8 operating the route nose-dived and crashed into a residential area in Patna, killing 60 people including 5 on the ground.
Dan-Air Flight 0034 was a fatal accident involving a Hawker Siddeley HS 748 series 1 turboprop aircraft operated by Dan-Air Services Limited on an oil industry charter flight from Sumburgh Airport, Shetland Islands, to Aberdeen Airport.
Pan Am Flight 526A, a Douglas DC-4, took off from San Juan-Isla Grande Airport, Puerto Rico, at 12:11 PM AST on April 11, 1952 on a flight to Idlewild International Airport, New York City with 64 passengers and five crew members on board. Due to inadequate maintenance, engine no. 3 failed after takeoff, followed shortly by engine no. 4. Nine minutes after takeoff, the aircraft ditched in rough seas 11.3 miles NW of San Juan Airport, broke apart and sank after three minutes. Panicking passengers refused to leave the sinking wreck. 52 passengers were killed, and 17 passengers and crew members were rescued by the USCG. After this accident it was recommended to implement pre-flight safety demonstrations for over-water flights.
The 1950 Heathrow BEA Vickers Viking crash occurred on 31 October 1950 when a Vickers Viking operated by British European Airways (BEA) crashed at London Airport in heavy fog. The aircraft was on a scheduled flight between Paris and London's Northolt airport and 28 of the 30 passengers and crew on board were killed.
On April 4, 1955, a United Airlines Douglas DC-6 named Mainliner Idaho crashed shortly after taking off from Long Island MacArthur Airport, in Ronkonkoma, Islip, New York, United States.
Iran Air Flight 277 was a scheduled Iran Air flight from Mehrabad International Airport, Tehran to Urmia, Iran. On January 9, 2011, the Boeing 727 serving the flight crashed after an aborted approach to Urmia Airport in poor weather. Of the 105 people on board, 78 were killed. The official investigation concluded that icing conditions and incorrect engine management by the crew led to a double engine flame-out, loss of altitude and impact with the ground.
The Douglas DC-2 is a 14-passenger, twin-engined airliner that was produced by the American company Douglas Aircraft Company starting in 1934. It competed with the Boeing 247. In 1935, Douglas produced a larger version called the DC-3, which became one of the most successful aircraft in history.
Edinburgh Air Charter Flight 3W, call sign "Saltire 3 Whisky", was a charter flight from Glasgow to Aberdeen. A Cessna 404 Titan, G-ILGW, was used for this flight. The flight had been chartered by Airtours International Airways to transport two pilots and seven flight attendants. Upon arrival in Aberdeen, the Airtours crewmembers were scheduled to operate a Boeing 757 on a charter flight to Palma de Mallorca.
Loganair Flight 670A (LC670A) was a scheduled cargo flight for the Royal Mail from Edinburgh-Turnhouse Airport, Scotland to Belfast International Airport. On 27 February 2001 the Short 360 operating the flight ditched in the Firth of Forth off Edinburgh at around 17:30 local time; the two crewmembers' bodies were found in the wreckage a few hours after the crash.
On April 22, 2019, a Northrop N-9MB aircraft crashed in Norco, California, United States, killing the pilot. The aircraft was the last survivor of four built and was destroyed in the crash. Investigators attributed the accident to the "pilot's loss of control", but were unable to conclusively determine a cause for the control loss, as severe impact damage to the engines, flight controls and propellers "precluded functional testing".
