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Last updated: 17 June 2019
Statuts:Enquête Officielle
Date:lundi 18 octobre 2004
Heure:19:59
Type/Sous-type:Silhouette image of generic A320 model; specific model in this crash may look slightly different
Airbus A320-232
Compagnie:TransAsia Airways
Immatriculation: B-22310
Numéro de série: 791
Année de Fabrication: 1998
Heures de vol:12124
Cycles:16248
Moteurs: 2 IAE V2527-A5
Equipage:victimes: 0 / à bord: 6
Passagers:victimes: 0 / à bord: 100
Total:victimes: 0 / à bord: 106
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Taipei-Songshan Airport (TSA) (   Taïwan)
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Nat.
Aéroport de départ:Tainan Airport (TNN/RCNN), Taïwan
Aéroport de destination:Taipei-Songshan Airport (TSA/RCSS), Taïwan
Numéro de vol:GE536
Détails:
The flight departed Tainan at 19:24. The pilot-in-commend (CM-1) was on the left seat as the pilot monitor (PM), the first officer (CM-2) was on the right seat as the pilot flying (PF). The crew executed an ILS approach to runway 10 at Taipei-Sung Shan. At 19:58:12, the flight received landing clearance. At 19:28, the ATIS broadcast for RCSS read "...expect ILS Approach. Runway one zero in use; wind variable at three; visibility four thousand five hundred meters;
light rain; cloud scattered eight hundred feet, broken one thousand eight hundred feet, overcast three thousand five hundred feet; temperature two three; dew point two two; QNH one zero zero eight hectopascals; wind shear on runway one zero; Low Level Wind Shear Advisory in effect, moderate to severe...".
The total landing weight was 55,140 kilogram, flaps were selected at 3 and the approach speed was 137 knots, ground spoilers were ARMED, autobrake selected MEDIUM, and antiskid selected ON at final approach.
At 19:59:04, radio altitude 282 feet, auto-pilot disengaged, autothrottle activated. The "RETARD" sound was heard four times between radio altitude 20 feet and the moment when the main landing gear touched the ground.
At 19:59:27, the main landing gear touched ground, airspeed 138 knots, ground speed 146 knots, heading 093 degrees, wind direction 297 degrees, wind speed 11 knots, the number 1/2 throttle level angle positioned at 19.7/22.5 degrees. Three seconds later the nose gear touched ground, the number 1/2 throttle level angle positioned at -22.5/22.5 degrees.
At 19:59:32, the autothrottle disconnected, number one thrust reverser deployed, but number two thrust reverser did not deploy. At 19:59:37 CM-1 called out "no brake", until 19:59:50, CM-1 called "no brake" five times. In the meantime, air speed 112 knots, ground speed 109 knots. The ground spoilers did not extend.
The aircraft touched down at 1,750 feet on runway 10, and rolled off the runway 321 feet from the end of runway 10, ending up with the nosegear in a ditch. According to the records in the Technical Log Book of the aircraft: The number 2 engine thrust reverser system was malfunctioned and was transferred to deferred defect (DD) item and the thrust reverser was deactivated in accordance with the procedures in the Minimum Equipment List.

Probable Cause:

FINDINGS RELATED TO PROBABLE CAUSES:
1. When the aircraft was below 20 ft RA and Retard warnings were sounded, the pilot flying didn’t pull thrust lever 2 to Idle detent which caused the ground spoilers were not deployed after touchdown though they were at Armed position, therefore the auto braking system was not triggered. Moreover, when the auto thrust was changed to manual operation mode automatically after touchdown, the thrust lever 2 was remained at 22.5 degrees which caused the Engine 2 still had an larger thrust output (EPR1.08) than idle position’s. Thereupon, the aircraft was not able to complete deceleration within the residual length of the runway, and deviated from the runway before came to a full stop, even though the manual braking was actuated by the pilot 13 seconds after touchdown.
2. The pilot monitoring announced "spoiler" automatically when the aircraft touched down without checking the ECAM display first according to SOPbefore made the announcement, as such the retraction of ground spoilers was ignored.
FINDINGS RELATED TO RISK:
1. After touchdown, when the thrust lever 2 was not pulled back to Idle position and the Retard warning sounds have ceased, there were no other ways to remind pilots to pull back the thrust lever.
2. The diminution of Runway Safety Zone proclaimed by Sungshan airport, and the fixed objects of non auxiliary aviation facilities and uncovered drainage ditch within the area do not meet the requirements of Civil Airports Designing and Operating Regulations.



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Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Tainan Airport et Taipei-Songshan Airport est de 271 km (169 miles).

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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