Thursday evening's blackout of the control tower at Suvarnabhumi International Airport in Bangkok caused delays to about 50 flights and forced eight aircraft to land elsewhere as they were running out of fuel.
The simultaneous breakdown of both the main and back-up power supplies paralysed the radar system caused problems for radar controlling flights landing at Suvarnabhumi airport, forcing some aircraft to land at U-Tapao Airport in Rayong-Chon Buri provinces, according to Deputy Transport Minister Chadchart Sittipunt.
According to Deputy Transport Minister Chatchard Sittipunt it took the air traffic control engineers 40 minutes to repair the malfunctioning radar system.
The radar breakdown may be the longest in the world for 45 years, and airline executives and pilots yesterday called the incident "inexcusable".
The company operating the radar system at Suvarnabhumi and other airports, said flights were diverted to Chiang Mai, Phuket, Kuala Lumpur and Siem Reap in Cambodia.
The Transport Ministry yesterday ordered the creation of a committee, headed by permanent secretary Silapachai Jarukasemrat, to complete an investigation into the incident within 15 days.
Suvarnabhumi International Airport opened in 2006 and is among the five busiest airports in the Asia-Pacific region. In 2011 it handled 47.2 million passengers.