Where did you read/hear this information? Are you able to provide a link please?
According to my husband, Vietnam didn't have radar in the 1990's. When he heard they may shut down at times in this day and age, he replied that he wouldn't be surprised. But he really doesn't know.
He used to fly a C-12 throughout that region and told a story of being off radar eighty miles out from land for about 300 miles of his flight.
I'm not certain we've heard anything directly from Vietnam.
A search on the internet for regional air traffic control will point to Ho Chi Min city as one of the Area Control Centers (
ACC).
[ame="http://en.wikipedia.org/wiki/List_of_Area_Control_Centers"]List of Area Control Centers - Wikipedia, the free encyclopedia[/ame]
This list of
ACC is maintained by International Civil Aviation Organization (ICAO) so I dont think the Vietnam ATC would shirk from this responsibility. Yes maybe they just got a proper ATC/radar in the last decade but it doesn't mean they are incompetent AFAIC.
On the radar being turn off may be it is a reference to the following control
"Approach and terminal control
Many airports have a radar control facility that is associated with the airport. In most countries, this is referred to as Terminal Control; in the U.S., it is referred to as a TRACON (Terminal Radar Approach Control). While every airport varies, terminal controllers usually handle traffic in a 30-to-50-nautical-mile (56 to 93 km) radius from the airport. Where there are many busy airports close together, one consolidated Terminal Control Center may service all the airports."
[ame="http://en.wikipedia.org/wiki/Air_traffic_control"]Air traffic control - Wikipedia, the free encyclopedia[/ame]
My guess for an airport that has this type of ATC with small number of flight and does not operate 24 hours, it would make sense to turn it off as all other flights not landing there will be manage by the
ACC as above.
This is just my basic understanding of air traffic control, I might be wrong somewhere but I think I got at least most of it right. :cheers: