Dutch F-16's intercept a B737 of SAS near Dachten (NL)

SN_Bigbirdy · Post by **SN_Bigbirdy** » 17 Feb 2006, 17:39

2 Dutch F-16s intercepted Thursday evening (17th February) a SAS B737 which was flying from Malaga to Oslo. ATC could not make contact with the plane, or the crew could not take contact with ATC. Under the supervision of Operations and Control Station Nieuw Milligen the 2 jets were sent to the Boeing to identify and to make contact with the crew.

Near Drachten (NL), the two jets went through the sound barrier on a high altitude causing a sonic boom. After the contact was restored, the two jets flew back to their homebase.

...

source : http://www.luchtvaartnieuws.nl/news/?ID=12430

Can anybody tell me what exactly is a sonic boom and do you only need to go through the sound barrier to create that...?

Simon

earthman · Post by **earthman** » 17 Feb 2006, 18:34

Sonic boom on Wikipedia.

SN_Bigbirdy · Post by **SN_Bigbirdy** » 18 Feb 2006, 10:45

Thanks for the quick replay Earthman, but I can't find in the text how the sonic boom restores the communication between two parties (cfr. ATC and aircraft). Or has this event nothing to do with communication?

Simon

Zorba · Post by **Zorba** » 18 Feb 2006, 11:08

A sonic boom is just when you are going faster then the speed of sound, the reason they mention it is because it's quite special (and makes a lot of noise

). Has nothing to do with communication

SN_Bigbirdy · Post by **SN_Bigbirdy** » 18 Feb 2006, 12:19

Near Drachten (NL), the two jets went through the sound barrier on a high altitude causing a sonic boom. After the contact was restored, the two jets flew back to their homebase.

Ah okay, then was the text on luchtvaartnieuws.nl a littlebit confusing (see quote, translated litteraly) because I first thought that they went throught the sound barrier and they restored the contact by doing that :p

Thanks for all the info guys!

Simon

Zorba · Post by **Zorba** » 18 Feb 2006, 12:34

SN_Bigbirdy wrote:
Near Drachten (NL), the two jets went through the sound barrier on a high altitude causing a sonic boom. After the contact was restored, the two jets flew back to their homebase.
Ah okay, then was the text on luchtvaartnieuws.nl a littlebit confusing (see quote, translated litteraly) because I first thought that they went throught the sound barrier and they restored the contact by doing that :p

Thanks for all the info guys!

Simon

Negative, mostly they do that by flying next to the aircraft to check the situation and then they put on their TCAS (which makes an "alarm" go off in the cockpit)

earthman · Post by **earthman** » 19 Feb 2006, 02:53

The sonic boom going through the cockpit will wake up those pilots for sure!

BerendBotje · Post by **BerendBotje** » 20 Apr 2006, 22:51

Hi Guys and Girls,

I'm new on this forum and was a bit browsing when finding this topic.
I've recorded the the interception of the SAS Braathens on 121.500. klik

Grtz David

edit: Girls

Established02 · Post by **Established02** » 20 Apr 2006, 23:21

Interesting audio. Thanks, BerendBotje.

loadmaster747 · Post by **loadmaster747** » 21 Apr 2006, 01:56

In fact, very interesting conversation (good & clear sound quality)
Thanks for sharing BerendBotje (welcome on Luchtzak)

By the way, how did you record this conversation?

Brgds
Dursun

BerendBotje · Post by **BerendBotje** » 21 Apr 2006, 09:28

loadmaster747 wrote:In fact, very interesting conversation (good & clear sound quality)
Thanks for sharing BerendBotje (welcome on Luchtzak)

By the way, how did you record this conversation?

Brgds
Dursun

Thanx.

I've got my scanner connected to a good outside antenna streaming on ATCBOX (DutchMil) and record the stream 24/7 on a PC. I guess this recording was a lucky one, but a very nice one indeed.

Grtz David

PS: There are some on my www below.

teddybAIR · Post by **teddybAIR** » 25 Apr 2006, 14:34

Hello, this might sound like a stupid question but exactly how much noise does a sonic boom make? I ask the question because I know planes are generally not allowed to fly supersonic in crowded areas due to the noise. But if a plane flying at fl 350 causes that much noise, it must be REALLY loud!

greetings,
bAIR

Bracebrace · Post by **Bracebrace** » 25 Apr 2006, 14:57

+200 decibels (210 according to the link on wikipedia).

Try this video: listen to the guys talking and try to imagine how load it would be...

http://video.google.com/videoplay?docid ... 06&pl=true

One remark: a sonic boom is not an explosion you hear once they go supersonic, the sonic boom is the sound of the sudden compression in the shockwave (like when you clap your hands but at a much higher energy level). As long as the aircraft is supersonic, the shockwave is present, and the sonic boom follows the aircraft.