@jon b, thanks Jon. Makes perfect sense. You’re too young for retirement. 😉

42 minutes ago, Ray Proudfoot said:

The emergency was declared at 08:45GMT (15:45 Local) so in daylight. Surely those massive CBs would be visible. Would it have been feasible to divert around them?

The weather situation of the Satellite Image Geo-Kompsat was published on The Aviation Herald at 08:00Z (Graphics: AVH/Korean Aerospace Research Institute)

 

https://avherald.com/img/singapore_b773_9v-swm_240521_sat_0800z.jpg

1 minute ago, RobPol471 said:

The weather situation of the Satellite Image Geo-Kompsat was published on The Aviation Herald at 08:00Z (Graphics: AVH/Korean Aerospace Research Institute)

https://avherald.com/img/singapore_b773_9v-swm_240521_sat_0800z.jpg

I don’t have access.

The Telegraph is reporting the aircraft dropped 6,000ft to 31,000ft in five seconds. That seems greater than gravity. Is 72,000fpm possible? 🤨

11 minutes ago, Ray Proudfoot said:

Is 72,000fpm possible? 🤨

Only once !

21 minutes ago, Ray Proudfoot said:

I don’t have access.

The Telegraph is reporting the aircraft dropped 6,000ft to 31,000ft in five seconds. That seems greater than gravity. Is 72,000fpm possible? 🤨

Try this link from The Aviation Herald :

https://avherald.com/h?article=518e5d47&opt=0

As for Thelegraph, they were denied by the publication of ADS-B data by Flightradar24 where it is clear that the variations maximums occurred between 36,800 and 35,200 feet and certainly not for 6000 feet.

https://www.flightradar24.com/blog/1-dead-dozens-injured-in-sq321-turbulence
 

This has a good graph of the ADS-B data, and shows as expected the media talking nonsense with regards to dropping 6000ft.

You can see the sudden bunt up in altitude,and the event lasts about a minute indicative of flying into a convective airmass.

The ADS-B wind data would be useful in ruling out CAT whereby a sudden increase in headwind would cause a climb but that’s usually more subtle, this looks more acute and therefore convective.

7 hours ago, Ray Proudfoot said:

I don’t have access.

The Telegraph is reporting the aircraft dropped 6,000ft to 31,000ft in five seconds. That seems greater than gravity. Is 72,000fpm possible? 🤨

 

No, it was 6000 feet in 3 minutes, and that was a controlled decent by the pilots to get down to stable air. The media are reporting all manner of nonsense.

 

Clear air turbulence is encountered 790 times per year, from what I've read. 

8 hours ago, jon b said:

The ADS-B wind data would be useful in ruling out CAT whereby a sudden increase in headwind would cause a climb but that’s usually more subtle, this looks more acute and therefore convective.

Surely convective + conveyor belt added... Frontal activity was there too, OFC...

No CAT event for sure, and yes, as we know, the SIGW charts help identifying and avoiding such areas....

1 hour ago, martin-w said:

Clear air turbulence is encountered 790 times per year, from what I've read. 

😂😂😂😂

Oh the media and aviation really don’t work do they .

Perhaps that figure is for occurrence reports of severe turbulence.?

As for clear air turbulence. You can expect that on almost every flight to some degree.

20 minutes ago, jon b said:

 

As for clear air turbulence. You can expect that on almost every flight to some degree.

 

I recall it was in regard to significant events.

Considering the huge number of flights each year, 790 is a rare occurrence, so yes, I think they were referring to severe events.

9 hours ago, RobPol471 said:

Try this link from The Aviation Herald :

https://avherald.com/h?article=518e5d47&opt=0

As for Thelegraph, they were denied by the publication of ADS-B data by Flightradar24 where it is clear that the variations maximums occurred between 36,800 and 35,200 feet and certainly not for 6000 feet.

Thanks. The Telegraph is clearly wrong. The crew controlled the descent.

deleted - hence it's invisibility

Edited May 23, 20242 yr by martin-w

In this post, the route of flight SQ321 has been reconstructed from 07.00 UTC until landing in Bangkok at approximately 08.45 UTC with the weather situation over Myanmar, where the accident occurred around 7.50 UTC.

https://x.com/simon_sat/status/1792907210483216696

This is why I keep my seat belt fastened.