|Title:||Runway departure, Incident of aircraft, Airbus A-340 registration EC-IDF, at Madrid-Barajas Airport (Madrid) on 7 September 2002|
|Micro summary:||An Airbus A340 departs from the runway following braking difficulties.|
|Event Time:||2002-09-07 at 1303 UTC|
|Publishing Agency:||Civil Aviation Accident and Incident Investigation Commission (CIAIAC)|
|Site of event:||Runway 33, Madrid-Barajas Airport|
|Departure:||Tenerife North Airport (Los Rodeos Airport), Tenerife, Canary Islands, Spain|
|Destination:||Madrid Barajas International Airport, Madrid, Spain|
|Airplane Type(s):||Airbus A340-313|
|Type of flight:||Revenue|
|Executive Summary:||On 7 September 2002, at 13:03:27 h, the left and right legs of the main landing gear of the aircraft Airbus A-340 registration EC-IDF touched down onto runway 33 of Madrid-Barajas Airport. At that moment, there was a residual pressure of 800 psi on the alternate hydraulic system of the brakes of the left main landing gear leg. The crew, that had already detected the presence of that residual pressure at 12:58:02 h when the WHEEL page of the ECAM was deployed before lowering the landing gear, had decided to land with the antiskid system disconnected, and had voluntarily moved the «antiskid & nose wheel steering» switch to the OFF position.|
At the beginning of the landing roll, the pilot in command applied reverse, did not press the brake pedals and used right rudder with the intend of keeping the aircraft aligned with the runway axis. At a point between 240 m and 900 m beyond the threshold of runway 33, the four wheels of the left main landing gear leg burst, and the aircraft deviated initially to the right of the runway axis and then to the left until both crew members applied full right brake, and the pressure reached 2500 psi on the brakes of the four right wheels that locked and burst.
Finally, the aircraft came to a stop with the left main landing gear leg at 5m from the left end of the asphalt area of runway 33, and at 146 m before the axis of the taxiway J-1, with the fuselage rotated around 10° to the left of the axis of runway 33. The rims of wheels 1, 2, 4, 5 and 6 suffered heavy damage, as well as the brakes 1, 5 and 6, due to the drag with the runway surface. There was a fire that affected all the wheels of the right and left legs of the landing gear, and it was quickly controlled by the fire fighters of the airport.
Runway 33 remained closed during approximately 6 h and 15 min and there were no personal damages.
The investigation determined that the cause of the residual pressure in flight was the left master cylinder P/N C24592020 S/N H2121, which had a length and a dead band longer than specified.
It is considered that the cause of this incident was the fact that, as a consequence of the appearance of residual pressure in flight in the left brakes, due to the fact that the left master cylinder P/N C 24592020, S/N H2121 was defective, and due to the lack of a procedure to be applied in that case, the crew voluntarily disconnected the antiskid system when the residual pressure was still present, which produced the burst of the left tires at touchdown.
The following factors could have prevented the incident:
— The existence in the Operations Manual of instructions to be followed in the case of residual pressure being observed in flight.
— The knowledge by the affected flight crew of similar cases that had been reported as complaints during June 2002.
— A more comprehensive analysis of the previous squawks of residual pressure.
— A more detailed training on the brake system during the type rating courses.
|Learning Keywords:||Operations - Braking Issues (General)|
|Operations - Runway Excursion|
|Operations - Upset - Uncommanded or excessive Yaw|
|Systems - Braking Systems|
|Systems - Landing Gear|
|Systems - Landing Gear - Tires|
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