|Title:||Failure of braking, Accident occurred on 21 May 1998 to Aircraft Airbus A-320-212 Registration G-UKLL At Ibiza Airport, Balearic Islands (Recommended)|
|Micro summary:||Failure of normal and alternate brakes on this Airbus A320.|
|Event Time:||1998-05-21 at 0046 UTC|
|Publishing Agency:||Civil Aviation Accident and Incident Investigation Commission (CIAIAC)|
|Report number:||A - 19/98|
|Site of event:||Ibiza, landing runway 24|
|Departure:||Manchester International Airport, Manchester, England|
|Destination:||Ibiza Airport, Eivissa, Balearic Islands, Spain|
|Airplane Type(s):||Airbus A320-212|
|Operator(s):||Leisure International Airways|
|Type of flight:||Revenue|
|Executive Summary:||During the cruise phase of the flight from Manchester to Ibiza, Autobrake Low was pre-selected for landing. Due to a computer logic channel discrepancy at the time of the selection, a 'BSCU Channel 2 Fault' was annunciated to the flight crew. The selection was repeated but the fault remained. Consultation with the aircraft's Flight Crew Operating Manual indicated that this was for crew awareness.|
After a normal ILS approach, the aircraft landed on Runway 24 at Ibiza Airport. On touchdown, the Normal Braking system failed, but this was not annunciated to the crew as the warning is inhibited from touchdown until engines are shut down.
An Alternate Braking system should have been automatically available to respond to the crew's braking input commands. However, there had been an ingress of a small amount of water and detergent mixture into the Brakes Dual Distribution Valve at some time prior to the event flight. The water had frozen during the cruise phase and had not melted by the time of landing, such that the valve action was inoperative, and the Alternate braking system did not work. The aircraft's Parking Brake system was available for use, but the flight crew had not been trained in its use in this manner.
The commander took control of the aircraft during the landing roll, as soon as he discovered that there was a braking abnormality. He applied maximum reverse thrust and attempted to swerve the aircraft from side to side in order to reduce the speed, but the aircraft left the end of the paved runway surface into the over-run area. The commander knew of the location of the airfield boundary wall at the runway extension and its proximity to the Mediterranean sea. He elected to turn the aircraft through some 90° to the right where the aircraft ran into a low earth embankment. The nose landing gear collapsed and the engines made contact with the embankment, bringing the aircraft to a stop.
An emergency evacuation was initiated and all main doors and escapeslides functioned normally. The passengers did not deploy any of the four overwing exits. There was no fire and only minor evacuation injuries occurred.
|Learning Keywords:||Operations - Braking Issues (General)|
|Operations - Evacuation|
|Operations - Runway Excursion|
|Systems - Braking Systems|
|Systems - Landing Gear|
|Close match:||Runway excursion, Boeing 737-223, Atlanta, November 1, 1998|
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