Accident
Last updated: 26 October 2014
Status:Definitief
Datum:zondag 27 april 1980
Tijd:06:55
Type:Hawker Siddeley HS-748-207 Srs. 2
Luchtvaartmaatschappij:Thai Airways
Registratie: HS-THB
Constructienummer: 1568
Bouwjaar: 1964
Aantal vlieguren:12791
Bemanning:slachtoffers: 4 / inzittenden: 4
Passagiers:slachtoffers: 40 / inzittenden: 49
Totaal:slachtoffers: 44 / inzittenden: 53
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:15 km (9.4 mijl) NE of Bangkok-Don Muang International Airport (BKK) (   Thailand) show on map
Fase: Nadering (APR)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Khon Kaen Airport (KKC/VTUK), Thailand
Vliegveld van aankomst:Bangkok-Don Muang International Airport (BKK/VTBD), Thailand
Vluchtnummer: 231
Beschrijving:
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)

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


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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Khon Kaen Airport en Bangkok-Don Muang International Airport bedraagt 366 km (229 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkĺs opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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