Air France Flight 4590
Encyclopedia
Air France Flight 4590 was a Concorde
Concorde
Aérospatiale-BAC Concorde was a turbojet-powered supersonic passenger airliner, a supersonic transport . It was a product of an Anglo-French government treaty, combining the manufacturing efforts of Aérospatiale and the British Aircraft Corporation...

 flight operated by Air France
Air France
Air France , stylised as AIRFRANCE, is the French flag carrier headquartered in Tremblay-en-France, , and is one of the world's largest airlines. It is a subsidiary of the Air France-KLM Group and a founding member of the SkyTeam global airline alliance...

 which was scheduled to run from Charles de Gaulle International Airport
Charles de Gaulle International Airport
Paris-Charles de Gaulle Airport , also known as Roissy Airport , in the Paris area, is one of the world's principal aviation centres, as well as France's largest airport. It is named after Charles de Gaulle , leader of the Free French Forces and founder of the French Fifth Republic...

 near Paris, to John F. Kennedy International Airport
John F. Kennedy International Airport
John F. Kennedy International Airport is an international airport located in the borough of Queens in New York City, about southeast of Lower Manhattan. It is the busiest international air passenger gateway to the United States, handling more international traffic than any other airport in North...

 in New York City. On 2000, it crashed in Gonesse
Gonesse
Gonesse is a commune in the northeastern suburbs of Paris, France. It is located from the centre of Paris.The commune lies immediately north of Le Bourget Airport and southwest of Charles de Gaulle International Airport.-History:...

, France. All one hundred passengers and nine crew members on board the flight died. On the ground, four people were killed with one left injured.

The flight was chartered
Air charter
Air charter is the business of renting an entire aircraft as opposed to individual aircraft seats...

 by German company Peter Deilmann Cruises
Peter Deilmann Cruises
Peter Deilmann Cruises is a German cruise company which has offered river cruises throughout Europe and several ocean cruises...

. All passengers were on their way to board the cruise ship
Cruise ship
A cruise ship or cruise liner is a passenger ship used for pleasure voyages, where the voyage itself and the ship's amenities are part of the experience, as well as the different destinations along the way...

 MS Deutschland
MS Deutschland (1998)
MS Deutschland is a German-registered cruise ship owned and operated by Peter Deilmann Cruises. She is decorated in the Art Deco style made famous by such classic ocean liners as the SS Ile de France and SS Normandie. The Deutschland was launched in 1998. She carries 513 passengers and 260 crew...

 in New York City for a 16-day cruise to South America.

This was Concorde's only accident in which fatalities occurred. It was the beginning of the end for Concorde as an airliner; the type was retired three years later.

Event summary

Post-accident investigation revealed that the aircraft was just at, if not exceeding, maximum weight for ambient temperature and other conditions, and up to one ton over maximum structural weight. As it left the gate, it was loaded such that the centre of gravity was excessively aft
Aft
Aft, in naval terminology, is an adjective or adverb meaning, towards the stern of the ship, when the frame of reference is within the ship. Example: "Able Seaman Smith; lay aft!". Or; "What's happening aft?"...

. Fuel transfer during taxi may have overfilled the number five wing tank. A twelve inch spacer that keeps the left main landing gear in alignment had not been replaced after recent maintenance, though the 2002 French Bureau Enquetes-Accidents investigation concluded that this did not contribute to the accident. The wind at the airport was light and variable that day, and was reported to the cockpit crew as an eight knot tailwind as they lined up on runway 26R. Over an hour delayed, the crew proceeded with take-off.

Five minutes before that decision, a Continental Airlines
Continental Airlines
Continental Airlines was a major American airline now merged with United Airlines. On May 3, 2010, Continental Airlines, Inc. and UAL, Inc. announced a merger via a stock swap, and on October 1, 2010, the merger closed and UAL changed its name to United Continental Holdings, Inc...

 DC-10
McDonnell Douglas DC-10
The McDonnell Douglas DC-10 is a three-engine widebody jet airliner manufactured by McDonnell Douglas. The DC-10 has range for medium- to long-haul flights, capable of carrying a maximum 380 passengers. Its most distinguishing feature is the two turbofan engines mounted on underwing pylons and a...

 departing for Newark
Newark Liberty International Airport
Newark Liberty International Airport , first named Newark Metropolitan Airport and later Newark International Airport, is an international airport within the city limits of both Newark and Elizabeth, New Jersey, United States...

, New Jersey, had lost a titanium
Titanium
Titanium is a chemical element with the symbol Ti and atomic number 22. It has a low density and is a strong, lustrous, corrosion-resistant transition metal with a silver color....

 alloy strip, 435 millimetres (17.1 in) long and about 29 millimetres (1.1 in) to 34 millimetres (1.3 in) wide, during takeoff from the same runway.

During the Concorde's subsequent take-off run, this piece of debris, still lying on the runway, cut a tyre causing rupture and tyre debris to be hurled by the sudden disruption of the centripetal force holding it together. A large chunk of this debris (4.5 kilograms or 9.9 lb) struck the underside of the aircraft's wing structure at an estimated speed of 500 kilometres per hour (310.7 mph). Although it did not directly puncture any of the fuel tanks, it sent out a pressure shockwave that eventually ruptured the number five fuel tank at the weakest point, just above the undercarriage
Undercarriage
The undercarriage or landing gear in aviation, is the structure that supports an aircraft on the ground and allows it to taxi, takeoff and land...

. Leaking fuel gushing out from the bottom of the wing was most likely to have been ignited by an electric arc in the landing gear bay or through contact with severed electrical cables. At the point of ignition, engines one and two both surged and lost all power, but engine one slowly recovered over the next few seconds. A large plume of flame developed; the Flight Engineer then shut down engine two, in response to a fire warning and the Captain's command.

Having passed V1 speed, the crew continued the take-off but the plane did not gain enough airspeed with the three remaining engines, because the severed electrical cables prevented the retraction of the undercarriage. The aircraft was unable to climb or accelerate, and it maintained a speed of 200 knots (108.9 m/s) at an altitude of 60 metres (196.9 ft). The fire caused damage to the port wing, and it began to disintegrate – melted by the extremely high temperatures. Engine number one surged again, but this time failed to recover. Due to the asymmetric thrust, the starboard wing lifted, banking the aircraft to over 100 degrees. The crew reduced the power on engines three and four in an attempt to level the aircraft, but with falling airspeed they lost control and stalled, crashing into the Hôtelissimo Les Relais Bleus Hotel near the airport.

The crew was trying to divert to nearby Le Bourget Airport
Le Bourget Airport
Paris – Le Bourget Airport is an airport located in Le Bourget, Bonneuil-en-France, and Dugny, north-northeast of Paris, France. It is now used only for general aviation as well as air shows...

, but accident investigators stated that a safe landing, given the aircraft's flight path, would have been highly unlikely.

As the cockpit voice recorder
Cockpit voice recorder
A cockpit voice recorder , often referred to as a "black box", is a flight recorder used to record the audio environment in the flight deck of an aircraft for the purpose of investigation of accidents and incidents...

 (CVR) transcript recorded it, the last intelligible words of the crew were (translated into English):
Co-pilot: "Le Bourget, Le Bourget, Le Bourget."

Pilot: "Too late (unclear)."

Control tower: "Fire service leader, correction, the Concorde is returning to runway zero nine in the opposite direction."

Pilot: "No time, no (unclear)."

Co-pilot: "Negative, we're trying Le Bourget" (four switching sounds).

Co-pilot: "No (unclear)."

Passenger and crew fatalities

All passengers and the crew were killed in the incident. Most of the passengers were German tourists en route to New York for a cruise.
Nationality |Passengers |Crew |Total
96 0 96
0 9 9
2 0 2
1 0 1
1 0 1
Total 100 9 109

Concorde grounded

The Concorde had been the safest working passenger airliner in the world according to passenger deaths per distance travelled. The crash of a Concorde was the beginning of the end of the aircraft's career.

A few days after the crash, all Concordes were grounded, pending an investigation into the cause of the crash and possible remedies.

Air France's Concorde operation had been a money-losing venture, but had been kept in service as a matter of national pride (by contrast, British Airways claimed a profit on its Concorde operations). Revenue service was resumed in 2001, until the remaining aircraft were retired in 2003.

Accident investigation

The official investigation was conducted by France's accident investigation bureau, the BEA
Bureau d'Enquêtes et d'Analyses pour la sécurité de l'Aviation Civile
The Bureau d'Enquêtes et d'Analyses pour la Sécurité de l'Aviation Civile is an agency of the French government, responsible for investigating aviation accidents and making safety recommendations based on what is learned from those investigations. It is headquartered in Building 153 on the grounds...

, and it was published on 2004. Only 1 video was found of the flight.

Conclusions

The investigators concluded that:
  • The aircraft was overloaded by about a ton
    Ton
    The ton is a unit of measure. It has a long history and has acquired a number of meanings and uses over the years. It is used principally as a unit of weight, and as a unit of volume. It can also be used as a measure of energy, for truck classification, or as a colloquial term.It is derived from...

     above the maximum safe take off weight.
  • After reaching take-off speed, the tyre of the number 2 wheel was cut by a metal strip lying on the runway, which came from the thrust reverser cowl door of the number 3 engine of a Continental Airlines DC-10 that had taken off from the runway several minutes before. This strip was installed in violation of the manufacturer's rules .
  • The aircraft was airworthy
    Airworthiness
    Airworthiness is a term used to describe whether an aircraft has been certified as suitable for safe flight. Certification is initially conferred by a Certificate of Airworthiness from a National Airworthiness Authority, and is maintained by performing required maintenance actions by a licensed...

     and the crew were qualified. The landing gear that later failed to retract had not shown serious problems in the past. Despite the crew being trained and certified, no plan existed for the simultaneous failure of two engines on the runway, as it was considered highly unlikely.
  • Aborting the take-off would have led to a high-speed runway excursion and collapse of the landing gear, which also would have caused the aircraft to crash.
  • While two of the engines had problems and one of them was shut down, the damage to the plane's structure was so severe that the crash would have been inevitable, even with the engines operating normally.

Previous tyre incidents

In November 1981, the American NTSB sent a letter of concern, which included safety recommendations for the Concorde, to the French BEA. This communiqué was the result of the NTSB's investigations of four Air France Concorde incidents, during a 20 month period, from , through February 1981. The NTSB described those incidents as "potentially catastrophic", because they were caused by blown tyres during take-off. The NTSB also expressed concern about the lack of adequate remedies, on the part of the French, as well as improper crew responses to those incidents.
  • 13 June 1979: The number 5 and 6 tyres blew out during a take-off from Washington, D.C. Dulles Airport. Shrapnel thrown from the tyres and rims damaged number 2 engine, punctured three fuel tanks, severed several hydraulic lines and electrical wires, in addition to tearing a large hole on the top of the wing, over the wheel well area.

  • 21 July 1979: Another blown tyre incident, during take-off from Dulles Airport. After that second incident the "French director general of civil aviation issued an air worthiness directive and Air France issued a Technical Information Update, each calling for revised procedures. These included required inspection of each wheel and tyre for condition, pressure and temperature prior to each take-off. In addition, crews were advised that landing gear should not be raised when a wheel/tyre problem is suspected."

  • October 1979: Tyres number 7 and 8 failed during a take-off from New York's JFK Airport. In spite of the well-publicized danger from the previous incidents, the crew ignored the new safety recommendations and raised the landing gear and continued to Paris. There was no subsequent investigation by the French BEA or the NTSB of that incident.

  • February 1981: While en-route from Mexico City to Paris, Air France (F-BTSD) blew more tyres during another take-off at Dulles Airport. Once again, the crew disregarded the new procedures by raising the landing gear. The blown tyres caused engine damage which forced the flight to land at New York JFK Airport. The NTSB's investigation found that there had been no preparation of the passengers for a possible emergency landing and evacuation. The CVR
    Cockpit voice recorder
    A cockpit voice recorder , often referred to as a "black box", is a flight recorder used to record the audio environment in the flight deck of an aircraft for the purpose of investigation of accidents and incidents...

     was also found to have been inoperative for several flights, including one which followed a layover in Paris.


To save on weight, Concorde was designed to take off without the assistance of flaps
Flap (aircraft)
Flaps are normally hinged surfaces mounted on the trailing edges of the wings of a fixed-wing aircraft to reduce the speed an aircraft can be safely flown at and to increase the angle of descent for landing without increasing air speed. They shorten takeoff and landing distances as well as...

 or slats
Leading edge slats
Slats are aerodynamic surfaces on the leading edge of the wings of fixed-wing aircraft which, when deployed, allow the wing to operate at a higher angle of attack. A higher coefficient of lift is produced as a result of angle of attack and speed, so by deploying slats an aircraft can fly at slower...

. That required a significantly higher air and tyre speed, during the take-off roll, which imposed a much greater centripetal force
Centripetal force
Centripetal force is a force that makes a body follow a curved path: it is always directed orthogonal to the velocity of the body, toward the instantaneous center of curvature of the path. The mathematical description was derived in 1659 by Dutch physicist Christiaan Huygens...

 load on the tyres. That higher speed increased the risk of tyre explosion during take-off. When the tyres did explode, much greater kinetic energy
Kinetic energy
The kinetic energy of an object is the energy which it possesses due to its motion.It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes...

 was carried by the resulting shrapnel travelling at great speeds tangent
Tangent
In geometry, the tangent line to a plane curve at a given point is the straight line that "just touches" the curve at that point. More precisely, a straight line is said to be a tangent of a curve at a point on the curve if the line passes through the point on the curve and has slope where f...

ially from the rims (the kinetic energy of an object being directly proportional to the square of its speed), increasing the risk of serious damage to the aircraft. A thicker skin on the bottom side of the wings could have prevented serious damage from an exploding tyre, but that would have added too much weight, cancelling out most of the advantage of not having flaps or slats.

Alternative theories

British investigators and former French Concorde pilots looked at several other possibilities that the report ignored, including an unbalanced weight distribution in the fuel tanks and loose landing gear. They came to the conclusion that the Concorde veered off course on the runway, which reduced take-off speed below the crucial minimum. The aircraft had passed close to a Boeing 747 carrying French President Jacques Chirac
Jacques Chirac
Jacques René Chirac is a French politician who served as President of France from 1995 to 2007. He previously served as Prime Minister of France from 1974 to 1976 and from 1986 to 1988 , and as Mayor of Paris from 1977 to 1995.After completing his studies of the DEA's degree at the...

 who was returning from the 26th G8 summit
26th G8 summit
The 26th G8 Summit was a political summit that took place in Nago, Okinawa, Japan, on July 21- July 23, 2000.-Overview:The Group of Seven was an unofficial forum which brought together the heads of the richest industrialized countries: France, Germany, Italy, Japan, the United Kingdom, the United...

 meeting in Okinawa, Japan, which was much further down the runway than the Concorde's usual take-off point; only then did it strike the metal strip from the DC-10.

The Concorde was overweight for the given conditions, with an excessively aft centre of gravity and taking off downwind. When it stood at the end of the runway, ready to roll, it was over its approved maximum take-off weight for the given conditions.

The Concorde was missing the crucial spacer from the left main landing-gear beam that would have made for a snug-fitting pivot. This compromised the alignment of the landing gear and the wobbling beam and gears allowing three degrees of movement possible in any direction. The uneven load on the left leg's three remaining tyres skewed the landing gear, with the scuff marks of four tyres on the runway showing that the plane was veering to the left.

Modifications and revival

The accident led to modifications being made to Concorde, including more secure electrical controls, Kevlar
Kevlar
Kevlar is the registered trademark for a para-aramid synthetic fiber, related to other aramids such as Nomex and Technora. Developed at DuPont in 1965, this high strength material was first commercially used in the early 1970s as a replacement for steel in racing tires...

 lining to the fuel tanks, and specially developed, burst-resistant tyres. The new-style tyres would be another contribution to future aircraft development.

The crash of the Air France Concorde nonetheless proved to be the beginning of the end for the type. Just before service resumed, the 11 September 2001 attacks took place, resulting in a marked drop in customer numbers, and contributing to the eventual end of Concorde flights. Air France stopped flights in , while British Airways ended its Concorde flights in .

June 2010, two groups were attempting to revive Concorde for "Heritage" flights in time for the 2012 Olympics. The British Save Concorde Group, SCG, and French group Olympus 593 were attempting to get four Rolls-Royce Olympus engines running smoothly at Le Bourget Air and Space Museum in France.

Criminal investigation

On 10 March 2005, French authorities began a criminal investigation of Continental Airlines, whose plane dropped the debris on the runway.

In September 2005, Henri Perrier, the former head of the Concorde division at Aérospatiale
Aérospatiale
Aérospatiale was a French aerospace manufacturer that built both civilian and military aircraft, rockets and satellites. It was originally known as Société Nationale Industrielle Aérospatiale...

, and Jacques Herubel, the Concorde chief engineer, came under investigation for negligence: a report stated that the company had more than 70 incidents involving Concorde tyres between 1979 and 2000, but had failed to take appropriate steps based upon these incidents.

On 12 March 2008, Bernard Farret, a deputy prosecutor in Pontoise
Pontoise
Pontoise is a commune in the northwestern suburbs of Paris, France. It is located from the centre of Paris, in the "new town" of Cergy-Pontoise.-Administration:...

, outside Paris, asked judges to bring manslaughter
Manslaughter
Manslaughter is a legal term for the killing of a human being, in a manner considered by law as less culpable than murder. The distinction between murder and manslaughter is said to have first been made by the Ancient Athenian lawmaker Dracon in the 7th century BC.The law generally differentiates...

 charges against Continental Airlines and four individuals:
  • John Taylor, a Continental mechanic
  • Stanley Ford, a Continental maintenance manager
  • Henri Perrier of Aérospatiale
  • Claude Frantzen, a former employee of the French airline regulator.


Charges against Jacques Herubel were reported to have been dropped, but on 2008, confirmation of the trial, including Herubel, was published. The trial started on 2010. Also facing fines or a custodial sentence were the designers of the plane, who prosecutors say knew that the plane's fuel tanks could be susceptible to damage from foreign objects, as well as a French official responsible for the regulation of the plane's safety.

Continental denied the charges, and claimed in court that the aircraft was already on fire when it passed over the titanium strip.

On 6 December 2010, Continental Airlines was found criminally responsible for the disaster by a Parisian court and was fined €200,000 ($271,628) and ordered to pay Air France . Continental mechanic John Taylor was given a 15-month suspended sentence, while another airline operative and three French officials were cleared of all charges. The court ruled that the crash resulted from a piece of metal from a Continental jet that was left on the runway; the object punctured a tyre on the Concorde and then ruptured a fuel tank. Another Continental employee, Stanley Ford, was found not guilty. Continental's lawyer, Olivier Metzner, said it would appeal the verdict.

The court also ruled that Continental would have to pay 70% of any compensation claims. As Air France has paid out to the families of the victims, Continental could be made to pay its share of that compensation payout.

In media

  • The time-line and causes of the crash were profiled in an episode of the National Geographic documentary series, Seconds From Disaster
    Seconds From Disaster
    -By original broadcast date:National Geographic Channel has broadcast many episodes under multiple titles. The title currently or most recently listed on the NGC Calendar is shown first...

    .
  • NBC
    NBC
    The National Broadcasting Company is an American commercial broadcasting television network and former radio network headquartered in the GE Building in New York City's Rockefeller Center with additional major offices near Los Angeles and in Chicago...

     aired a Dateline NBC
    Dateline NBC
    Dateline NBC, or Dateline, is a U.S. weekly television newsmagazine broadcast by NBC. It previously was NBC's flagship news magazine, but now focuses on true crime stories. It airs Friday at 9 p.m. EST and after football season on Sunday at 7 p.m. EST.-History:Dateline is historically notable for...

    documentary on the crash, its causes, and its legacy on , 2009.
  • Channel 4
    Channel 4
    Channel 4 is a British public-service television broadcaster which began working on 2 November 1982. Although largely commercially self-funded, it is ultimately publicly owned; originally a subsidiary of the Independent Broadcasting Authority , the station is now owned and operated by the Channel...

     and Discovery Channel Canada aired a documentary called Concorde's Last Flight.
  • Smithsonian Channel
    Smithsonian Networks
    Smithsonian Networks is a joint venture between CBS Corporation's Showtime Networks and the Smithsonian Institution. The service consists of Smithsonian Channel, Smithsonian On Demand, and ....

     aired a 90-minute documentary Concorde: Flying Supersonic in 2010.
  • This aircraft was used in the making of the movie The Concorde ... Airport '79.

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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