Occurrence | |
---|---|
Date | 22 October 1963 |
Summary | Deep stall |
Site | Near Chicklade, Wiltshire, England, United Kingdom 51°07′31″N2°08′09″W / 51.1252672°N 2.1358360°W Coordinates: 51°07′31″N2°08′09″W / 51.1252672°N 2.1358360°W |
Aircraft | |
Aircraft type | BAC One-Eleven 200AB |
Operator | British Aircraft Corporation |
Registration | G-ASHG |
Crew | 7 |
Fatalities | 7 |
Survivors | 0 |
The 1963 BAC One-Eleven test crash was a fatal accident of a British Aircraft Corporation prototype aircraft on 22 October 1963, near Chicklade in Wiltshire, England while it was undertaking a test flight. All seven crew members on board the BAC One-Eleven were killed.
The accident occurred during a test flight of the first prototype BAC One-Eleven (registration G-ASHG) which had taken off from Wisley Airfield with seven crew on board, piloted by Mike Lithgow. The aircraft was on its fifth test flight to assess stability and handling characteristics during the approach to—and recovery from—a stall with the centre of gravity in varying positions. From an altitude of 16,000 feet (4,900 m) and with the flaps extended 8°, the aircraft entered a stable stall and descended at a high rate in a horizontal attitude, eventually striking the ground with very little forward speed. The aircraft broke up on impact at Cratt Hill, near Chicklade, a small village in southern Wiltshire and caught fire, killing all seven crew on board.
The aircraft was on its fifth stalling test of the day, and the crash occurred 23 minutes after takeoff from Wisley. The crew were Lt. Cdr. M J Lithgow OBE, Chief Test Pilot; Capt. R Rymer (Test Pilot); B J Prior (Aerodynamicist); C J Webb (Designer); R A F Wright (Senior Observer); G R Poulter (Observer) and D J Clark (Observer). [1]
The cause of the accident was the aircraft entering a stable stalled condition, recovery from which was impossible due to the wings blocking the airflow over the elevators on the tail. This was the first accident to be attributed to the phenomenon known as deep stall, peculiar to rear engine T-tailed aircraft. [2]
Once the condition of deep stall was recognised, relatively simple preventative measures were introduced, including stick-shakers indicating an approaching stall and stick-pushers which automatically operate the elevators and physically lower the nose before the stall is reached, while the tailplane and pitch controls are still effective. [3] [4]
In October 2013 a stone memorial was dedicated at the crash site, listing the seven victims. [1] The ceremony was attended by the CO of the Royal Navy Historic Flight; Lord Margadale (the owner of the land); and families of the crew members. [5] The memorial bears a quotation from the annotation of the 1817 edition of The Rime of the Ancient Mariner , a poem by Samuel Taylor Coleridge: '...and everywhere the blue sky belongs to them and is their appointed rest and their native country.' [1]
In fluid dynamics, a stall is a reduction in the lift coefficient generated by a foil as angle of attack increases. This occurs when the critical angle of attack of the foil is exceeded. The critical angle of attack is typically about 15°, but it may vary significantly depending on the fluid, foil, and Reynolds number.
The BAC One-Eleven was an early jet airliner produced by the British Aircraft Corporation (BAC). Originally conceived by Hunting Aircraft as a 30-seat jet, before its merger into BAC in 1960, it was launched as an 80-seat airliner with a British United Airways order on 9 May 1961. The prototype conducted its maiden flight on 20 August 1963, and it was first delivered to its launch customer on 22 January 1965. The 119-seat, stretched 500 series was introduced in 1967. Total production amounted to 244 until 1982 in the United Kingdom and between 1982 and 1989 in Romania where nine Rombac One-Eleven were licence-built by Romaero.
A stick shaker is a mechanical device designed to rapidly and noisily vibrate the control yoke of an aircraft, warning the flight crew that an imminent aerodynamic stall has been detected. It is typically present on the majority of large civil jet aircraft, as well as most large military planes.
This is a list of aviation-related events from 1963.
Lufthansa Flight 540 was a scheduled commercial flight for Lufthansa, serving the Frankfurt–Nairobi–Johannesburg route.
Banat Air Flight 166 was an Antonov Antonov An-24 chartered on 13 December 1995 from Romavia by Banat Air.
A stick pusher is a device installed in some fixed-wing aircraft to prevent the aircraft from entering an aerodynamic stall. Some large fixed-wing aircraft display poor post-stall handling characteristics or are vulnerable to deep stall. To prevent such an aircraft approaching the stall the aircraft designer may install a hydraulic or electro-mechanical device that pushes forward on the elevator control system whenever the aircraft's angle of attack reaches the pre-determined value, and then ceases to push when the angle of attack falls sufficiently. A system for this purpose is known as a stick pusher.
On March 4, 1966, Canadian Pacific Air Lines Flight 402 (CP402) struck the approach lights and a seawall during a night landing attempt in poor visibility at Haneda Airport in Japan. Of the 62 passengers and 10 crew, only 8 passengers survived.
Michael John Lithgow, OBE was a British aviator and chief test pilot for Vickers Supermarine who became the holder of the World Absolute Air Speed Record in 1953 flying a Supermarine Swift. He died when the prototype BAC One-Eleven airliner crashed in 1963.
Chicklade is a small village and civil parish in Wiltshire, South West England. The village is on the A303 road, about 7 miles (11 km) south of Warminster. The parish includes the hamlet of Upper Pertwood.
Aeropostal Alas de Venezuela Flight 108 was a short-haul flight from La Chinita International Airport in Maracaibo, Venezuela to Santa Barbara Ed-L Delicias Airport that crashed on March 5, 1991.
Avensa Flight 358 was a scheduled airline flight from Maturín Airport to Simón Bolívar International Airport in Venezuela that crashed on 22 December 1974 killing all 75 people on board.
Northwest Orient Airlines Flight 705 was a scheduled passenger flight operated on February 12, 1963, that broke up in midair and crashed into the Florida Everglades shortly after takeoff from Miami International Airport in a severe thunderstorm. The plane was destined for Portland, Oregon, via Chicago, Spokane, and Seattle.
United Air Lines Flight 34 was a scheduled flight departing from San Francisco to Los Angeles, California, on December 27, 1936. At 7:36 am, the co-pilot requested the UAL localizer beacon at Burbank be turned on. The company radio requested aircraft position, to which the co-pilot replied, "just a minute." The aircraft crashed at the head of Rice Canyon at 7:38 am, killing all 12 passengers and crew. The probable cause was found to be "...an error on the part of the pilot for attempting to fly through Newhall pass at an altitude lower than the surrounding mountains without first determining by radio the existing weather."
On 3 June 1966, a newly built Hawker Siddeley Trident jetliner crashed during a pre-delivery test flight near the village of Felthorpe, Norfolk, England, killing all four crew. The aeroplane had entered a deep stall from which the crew were unable to recover. It was the first loss of a Trident aircraft.
On 7 January 1972, Iberia Flight 602 crashed into a mountain near Ibiza Town, Spain. The Sud Aviation SE 210 Caravelle operating the flight had taken off from Valencia Airport in Valencia, Spain, destined for Ibiza Airport on the Balearic island of Ibiza. All 98 passengers and 6 crew died in the crash.
Aeroflot Flight 25 was a scheduled domestic passenger flight that crashed on 4 April 1963 in the region of Rybnaya Sloboda, Tatar ASSR, Russian SFSR the while en route from Moscow-Sheremetyevo to Krasnoyarsk Airport, Russian SFSR. All 67 people aboard were killed in the accident.
Trans International Airlines Flight 863 was a ferry flight from John F. Kennedy International Airport in New York City to Washington Dulles International Airport. On September 8, 1970, the Douglas DC-8 crashed during take-off from JFK's runway 13R. None of the 11 occupants, who were all crew members, survived.
Flightline Flight 101 was an international flight from Barcelona, Spain to Oran, Algeria. It crashed into the sea, probably due to a lightning strike leading to a loss of electricity.