Investigation Summary
The accident was triggered by a 43-centimeter titanium strip that had fallen off a Continental Airlines DC-10 which departed five minutes earlier. As the Concorde reached 175 knots, its front right tire of the left main landing gear struck this strip and shredded. A large piece of rubber (approx. 4.5kg) struck the underside of the left wing. While it did not pierce the wing, it created a powerful shockwave in the fuel tank (hydrodynamic ram effect) that burst the tank from the inside out. Leaking fuel ignited, likely due to electrical arcing in the landing gear bay or contact with hot engine components. The fire caused engines 1 and 2 to surge and lose power. Because the landing gear failed to retract due to damage, the aircraft suffered immense drag and could not climb or accelerate, eventually stalling and rolling into the Hotelissimo hotel.
Final Conclusions
The BEA concluded that the accident was caused by a tire burst after the aircraft ran over a titanium wear strip lost by a Continental Airlines DC-10 five minutes earlier. A large rubber fragment struck the underside of the left wing, generating a hydrodynamic shockwave that ruptured fuel tank 5 from the inside. Leaking fuel ignited, likely from electrical arcing in the landing gear bay or contact with hot engine parts. The resulting fire caused engines 1 and 2 to lose thrust, and damage prevented gear retraction. Unable to climb or accelerate on effectively two engines with massive drag, the aircraft stalled and rolled into a hotel in Gonesse. The investigation exposed a long-standing vulnerability of Concorde's integral wing tanks to high-energy tire debris and led to mandatory Kevlar tank liners, new NZG radial tires, and reinforced landing gear bay wiring before the type was allowed to return to service.
Video Analysis
How the Crash of Flight 4590 Destroyed Concorde's Mystique — A detailed look at how a small piece of metal from a DC-10 led to the only fatal accident of the Concorde and the eventual retirement of the supersonic fleet.
Watch on YouTube ↗If playback is blocked, the owner has disabled embedding — use the link above.
Systems & Failure Modes
Integral Fuel Tanks (Tank 5)
Concorde's wings doubled as fuel tanks with thin aluminium skins and no self-sealing bladders. The tire fragment did not pierce tank 5; instead the impact created a hydrodynamic pressure wave in the full tank that ruptured it from the inside, ejecting fuel at high rate through a large lower-skin panel.
Michelin Type H Tires
The original bias-ply tires were known to shed large, heavy rubber chunks when they burst. Concorde had a long history of tire-related incidents (57 recorded, 6 leading to tank penetration or fire) that were never fully resolved before this accident.
Rolls-Royce/SNECMA Olympus 593
Engines 1 and 2 ingested flame, hot gas and possibly fuel. Engine 2 surged and lost thrust; the crew shut it down per drill. Engine 1 also lost significant thrust. With only two working engines on one side, asymmetric thrust and drag made climb impossible.
Afterburners (Reheat)
Reheat was selected for takeoff as normal. The fire ignited near the reheat nozzles of engines 1 and 2, and continued reheat operation likely sustained the external fire even after tank leakage began.
Main Landing Gear
Debris and heat damaged the left main gear bay. The gear failed to retract after the crew called for gear up, producing enormous drag. Investigators also examined a missing left-bogie spacer that may have caused a slight yaw during the takeoff roll.
Flight Controls (Analog Fly-by-Wire)
Concorde used an analog fly-by-wire system with mechanical backup. As thrust dropped on the left side and drag rose, the aircraft could not maintain V2. Speed decayed to around 200 kt with the stick shaker active; the aircraft rolled left and stalled at low altitude with no recovery margin.
Fire Detection & Suppression
The engine fire loops triggered warnings for engines 1 and 2. However, the fire was external, fed by leaking fuel on the wing underside, and could not be extinguished by the engine bay bottles.
Interesting Facts
- 01This was the only fatal accident in the 27-year operational history of Concorde.
- 02Concorde had a long tire-failure history: 57 tire-related incidents were recorded before the crash, 6 of which caused fuel tank penetration or a fire.
- 03The 43 cm titanium wear strip that punctured the tire had been fabricated and fitted to a Continental DC-10 engine cowl outside the manufacturer's specification.
- 04The aircraft was about 810 kg over its maximum takeoff weight and had a tailwind component, though investigators did not consider this a primary cause.
- 05Four people on the ground at the Hôtelissimo hotel in Gonesse were killed in addition to all 109 on board.
- 06The flight was a charter for German tour operator Peter Deilmann Cruises, carrying passengers to meet a cruise ship in New York.
- 07Concorde returned to service in November 2001 with Kevlar-lined tanks and new tires, but was permanently retired by Air France and British Airways in 2003 due to falling demand after 9/11 and the accident.
- 08A French court in 2010 convicted Continental Airlines of involuntary manslaughter, but the verdict was overturned on appeal in 2012.
Safety Actions & Advisories
Kevlar Fuel Tank Liners
All remaining Concordes were retrofitted with flexible Kevlar-rubber liners inside the most vulnerable wing fuel tanks to contain fuel in the event of a tank rupture and prevent large-volume leaks.
Michelin NZG (Near Zero Growth) Tires
New radial NZG tires were fitted. They are far more resistant to bursting and, when they do fail, break into much smaller and lighter fragments unlikely to rupture a tank.
Reinforced Electrical Wiring in Landing Gear Bay
Wiring in the main gear bays was rerouted and shielded to reduce the risk of arcing acting as an ignition source for any leaking fuel.
Runway FOD Inspections at CDG
Aéroports de Paris tightened foreign object debris inspection procedures on runways used by Concorde, including more frequent sweeps before Concorde departures.
Airworthiness Directives (DGAC / CAA)
French DGAC and UK CAA suspended Concorde's Certificate of Airworthiness in August 2000. It was only reinstated in September 2001 after the tank liner, tire and wiring modifications were completed and validated by test flights.
Continental Airlines DC-10 Maintenance Findings
The titanium wear strip that fell from the Continental DC-10 had been fabricated and installed contrary to McDonnell Douglas specifications. This led to industry-wide reminders about the use of only approved parts on engine cowlings.
Known Controversies & Unanswered Questions
The Missing Spacer Theory
Reference ↗Some investigators and pilots argued that a missing spacer in the landing gear bogie caused the aircraft to veer on the runway, contributing to the strike, though the official BEA report maintained the debris strike was the sole primary cause.