Accident
Last updated: 31 October 2014
Statuts:Enquête Officielle
Date:dimanche 27 avril 1980
Heure:06:55
Type/Sous-type:Hawker Siddeley HS-748-207 Srs. 2
Compagnie:Thai Airways
Immatriculation: HS-THB
Numéro de série: 1568
Année de Fabrication: 1964
Heures de vol:12791
Equipage:victimes: 4 / à bord: 4
Passagers:victimes: 40 / à bord: 49
Total:victimes: 44 / à bord: 53
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:15 km (9.4 milles) NE of Bangkok-Don Muang International Airport (BKK) (   Thaïlande) show on map
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Khon Kaen Airport (KKC/VTUK), Thaïlande
Aéroport de destination:Bangkok-Don Muang International Airport (BKK/VTBD), Thaïlande
Numéro de vol: 231
Détails:
The aircraft was approaching runway 21R at an altitude of 1500 feet when it entered a severe thunderstorm. The HS-748 was caught in a downdraft, struck the ground slightly banked to the right, slid for 510 feet and broke up.

PROBABLE CAUSE: "The pilot directed the aircraft into a thunderstorm in an early dissipating stage. The aircraft was severely affected by a downdraft and lost altitude rapidly. At that time the altitude of the aircraft was only 1500ft and the pilot could not maintain altitude of the aircraft. The aircraft crashed into the ground and ran forward.
Factors which caused the pilot to direct the aircraft into the thunderstorm were:
1. During flight prior to the accident, the pilot did not tune his radio to the ATIS frequency, so he did not receive the special weather report (SPECI) broadcast four minutes before the accident advising that there was a thunderstorm in the area he would soon encounter.
2. The pilot did not make use of airborne weather radar.
3. While the pilot was approaching at high altitude, he could see the thunderstorm, but it was not in his flight path to Bangkok International Airport. When the pilot was descending in compliance with Bangkok Approach Control instruction, he was not aware that the rain area which he was entering was a thunderstorm which was moving and developing severely. The thunderstorm which had developed to the severe stage was moving and intercepted the aircraft.
4. The pilot assumed that flying by radar vector would be safe as he thought that the Approach Control Radar could detect the thunderstorm and Bangkok Approach Control would not vector the aircraft into the thunderstorm." (Thai Accident Investigation Committee)

Sources:
» ICAO Circular 178-AN/111(62-71)


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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Khon Kaen Airport et Bangkok-Don Muang International Airport est de 366 km (229 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 tels qui sont connus à ce jour.
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