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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
3
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 escape
slides functioned normally. The passengers did not deploy any of the four
overwing exits. There was no fire and only minor evacuation injuries occurred.

　
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