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Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 9:55 am
by scotta
Whats the minimum height seperation needed between flights?
I was on a flight from LCY to EDI last night. Looking out the window another flight came from the east and passed directly overhead FAST! Flightradar shows less than 1000ft seperation. That normal?
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 9:57 am
by NotoriousREV
Can’t see the numbers on the vid. What was the height difference?
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 10:03 am
by scotta
NotoriousREV wrote: Thu Oct 31, 2019 9:57 am
Can’t see the numbers on the vid. What was the height difference?
975 feet
go right to the start of the video it shows the height then i click on the second plane and scroll to the height.
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 10:16 am
by mik
Vid plays fuzzy at the start for me.
Supposed to be minimum 1000ft separation AFAIK. I use FlightRadar, but not sure how accurate it is.... would probably need proper ATC data to assess, but 975ft sounds about right.
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 10:17 am
by Simon
I think 1000 feet is the minimum, but if one plane is above the 'standard' pressure switchover (sorry, I forget the name) and one below it then that could allow for a small discrepancy.
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 10:19 am
by NotoriousREV
scotta wrote: Thu Oct 31, 2019 10:03 am
NotoriousREV wrote: Thu Oct 31, 2019 9:57 am
Can’t see the numbers on the vid. What was the height difference?
975 feet
go right to the start of the video it shows the height then i click on the second plane and scroll to the height.
I get what you’re doing but the numbers aren’t viewable on a mobile phone even full screen
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 10:21 am
by mik
More importantly, did you get the pilot to do a 1000rpm to vMax in 3rd?
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 10:35 am
by scotta
NotoriousREV wrote: Thu Oct 31, 2019 10:19 am
scotta wrote: Thu Oct 31, 2019 10:03 am
NotoriousREV wrote: Thu Oct 31, 2019 9:57 am
Can’t see the numbers on the vid. What was the height difference?
975 feet
go right to the start of the video it shows the height then i click on the second plane and scroll to the height.
I get what you’re doing but the numbers aren’t viewable on a mobile phone even full screen
Sent you a higher res one by special message!
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 11:38 am
by Matty
mik wrote: Thu Oct 31, 2019 10:21 am
More importantly, did you get the pilot to do a 1000rpm to vMax in 3rd?
Reminds me of a story on the SR-71
https://nationalinterest.org/blog/buzz/ ... heck-72136
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 11:41 am
by Beany
If we get a reply, and then the news channels start reporting a plane crash, I blame you guys.
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 11:59 am
by mik
Dont come on here with your bad altitude Beany.
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 12:41 pm
by Beany
mik wrote: Thu Oct 31, 2019 11:59 am
Dont come on here with your bad altitude Beany.
Ah, stick it up yer flaps.
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 1:01 pm
by scotta
Beany wrote: Thu Oct 31, 2019 12:41 pm
mik wrote: Thu Oct 31, 2019 11:59 am
Dont come on here with your bad altitude Beany.
Ah, stick it up yer flaps.
As long as we dont see your black box...
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 6:20 pm
by nuttinnew
Maybe so close because a flight was delayed. Was your ride on time?
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 8:43 pm
by tim
I am not IanF nor do I play him on TV, but I do know that Reduced Vertical Separation Minima is 1000ft with suitably equipped aircraft.
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 8:57 pm
by Orange Cola
1000ft between commercial aircraft sounds... close to me.
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 9:01 pm
by mik
Would you propose a Cure?
Re: Altitude separation FAO - IanF
Posted: Thu Oct 31, 2019 9:03 pm
by Orange Cola
Certainly wouldn’t be the Clash.
Re: Altitude separation FAO - IanF
Posted: Sat Nov 02, 2019 1:47 pm
by IanF
Few things affecting the separation- firstly for a more comfortable ride, the aircraft have a soft hold of their altitude and so fly +/- 50ft from their assigned level. Secondly the three separate air data sources on those aircraft have an acceptable variation of +/- 200ft at high altitudes. (Typically the difference is around 20-30ft). The transponder relates to a particular source on the flight deck which is not necessarily the same one as the autopilot is receiving its altitude info from. Finally, an aircraft hasn’t deviated from it’s assigned level until they are over 200ft away.
The aircraft have a system call tcas that monitors closure rates and prevents them getting too close and ATC have a predictive tool that highlights issues to them aswell.
Tl;dr.- 975ft is fine
Re: Altitude separation FAO - IanF
Posted: Tue Nov 05, 2019 3:39 pm
by scotta
IanF wrote: Sat Nov 02, 2019 1:47 pm
Few things affecting the separation- firstly for a more comfortable ride, the aircraft have a soft hold of their altitude and so fly +/- 50ft from their assigned level. Secondly the three separate air data sources on those aircraft have an acceptable variation of +/- 200ft at high altitudes. (Typically the difference is around 20-30ft). The transponder relates to a particular source on the flight deck which is not necessarily the same one as the autopilot is receiving its altitude info from. Finally, an aircraft hasn’t deviated from it’s assigned level until they are over 200ft away.
The aircraft have a system call tcas that monitors closure rates and prevents them getting too close and ATC have a predictive tool that highlights issues to them aswell.
Tl;dr.- 975ft is fine
[mention]IanF[/mention] Ta
