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End of ATSOCAS

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Old 26th Aug 2019, 14:38
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London Info and Scotthish Info still operate but they're manned by ATC assistants with an Area FISO Licence hence they are unable to provide a radar service although I understand the Scottish FISOs only do day duties and hand over to one of the main Scottish sector controllers at night..
(Now someone will come along and say 'FISOs in my country can provide a radar service')
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Old 26th Aug 2019, 21:36
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Originally Posted by chevvron
London Info and Scotthish Info still operate but they're manned by ATC assistants with an Area FISO Licence hence they are unable to provide a radar service although I understand the Scottish FISOs only do day duties and hand over to one of the main Scottish sector controllers at night..
(Now someone will come along and say 'FISOs in my country can provide a radar service')
FISO in Denmark provide radar service, call them, you get a squawk, get identified and traffic info on other traffic in the area, also on traffic they have not directly identified, but can see
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Old 27th Aug 2019, 11:01
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Originally Posted by chevvron
I don't get your point; controllers in France (so I'm told) routinely identify aircraft who call them requesting Flight Information Service; once identified the height readout MUST be verified and thereafter, traffic information and (when necessary) advisory avoiding action is passed.
In the UK, controllers MUST identify and verify altitude readout for traffic requesting TS or DS unless the identity is transferred from another radar unit who will have already done this. Traffic requesting Basic service ie what used to be called Flight Information Service MAY be identified and if so, any altitude readout associated with their SSR must be verified. Thereafter even this traffic may be passed generic information on possible conflicting traffic especially when 'duty of care' requires it ie if you see a 'dead ringer' for your traffic you should tell the pilot about it rather than sit there and do nothing.
In the case quoted at Bournemouth, even though the Falcon was only on Traffic Service in the Initial Approach phase, NOT the Final Approach stage, he was identified so the controller could have offered advisory avoiding action (traffic is in your ......, if not sighted suggest left/right heading...) or if the confliction looked serious, upgraded the Falcon to De-confliction service and passed avoiding action prior to passing the traffic information.
Chevron, my point is simple and has nothing to do with the a/c you ARE talking to - which as you say is validated, verified etc. - but the ones that you are NOT talking to. How can you give SENSIBLE Deconfliction and/or Traffic information to the one you are talking to, against the one that you are not? Now, I know that you can obviously but it gets messy with words such as "indicating" and "altitude unverified" etc being used. In the Bournemouth incident the controller did not know for sure what level the Mooney was at. He had to make assumptions. (One I heard at work recently while the radar ATCO validated and verified was 1000 feet lower than the pilot reported as he checked in! A pretty clueless piece of airmanship from the pilot to call at 1800' when he was at 800'. Altimeter incorrectly set !!!) To get the job done properly you need to either be talking to everyone, to be confident that you can see on radar (or know about if procedural) all the traffic that is out there and/or be sure that they are where they say they are both horizontally and vertically. Right? So, what is really the point of EASA class E as far as Air traffic Control services are concerned, when VFR don't need to talk to you, don't need to have a functioning transponder and can do what they like? Surely this is identical to the current situation with ATSOCAS in class G? Now, if you add a TMZ to the class E at least you have another layer of security.
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Old 27th Aug 2019, 15:46
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Simple. If your unknown confliction is showing a '7000' squawk (indicating a/c not receiving radar service) and no altitude readout you vector your own traffic at least 5nm away from it to allow for an unpredictable turn by the unknown.
If it's showing an altitude readout then irrespective of what is set on the aircraft's altimeter which will always transmit an altitude based on 1013.2 hPa, if the altitude indicated on the radar display (which will have the current QNH dialled in to enable it to convert from 1013.2) is showing 3,000ft above or below your traffic then traffic information is sufficient; if it's less than 3,000ft then the above applies.
I've never worked in Class E airspace, only Class G but I would imagine you would take the above action in airspace of either classification.
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Old 27th Aug 2019, 17:01
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I think, as will soon be the case with the new class E for the LF ACP, you are only obliged to pass traffic to the IFR you are providing a radar control service to, you do not vector to avoid.... Interesting theoretical cases to be discussed by lawyers et al....
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Old 27th Aug 2019, 19:39
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Originally Posted by chevvron
Simple. If your unknown confliction is showing a '7000' squawk (indicating a/c not receiving radar service) and no altitude readout you vector your own traffic at least 5nm away from it to allow for an unpredictable turn by the unknown.
If it's showing an altitude readout then irrespective of what is set on the aircraft's altimeter which will always transmit an altitude based on 1013.2 hPa, if the altitude indicated on the radar display (which will have the current QNH dialled in to enable it to convert from 1013.2) is showing 3,000ft above or below your traffic then traffic information is sufficient; if it's less than 3,000ft then the above applies.
I've never worked in Class E airspace, only Class G but I would imagine you would take the above action in airspace of either classification.
Chevvy,

Precisely! So there is not a gnats privates difference between class E - as proposed by EASA - and what actually and currently happens under a Deconfliction Service at the moment in UK class G!! On reflection therefore, one could argue that a potential widespread adoption of E by airports currently operating under G will change little for the end user.
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Old 27th Aug 2019, 19:41
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Originally Posted by Not Long Now
I think, as will soon be the case with the new class E for the LF ACP, you are only obliged to pass traffic to the IFR you are providing a radar control service to, you do not vector to avoid.... Interesting theoretical cases to be discussed by lawyers et al....
Blimey! So you were vectoring to Deconflict under DS in class G and now all you do is pass traffic! Is this progress...?
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Old 27th Aug 2019, 20:28
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No, was providing basic service in class G, now will be providing traffic info, if workload permits, and separation, ion appropriate, in controlled airspace. A great leap forward apparently.
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Old 27th Aug 2019, 21:19
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Lissart, You requested a definition of ‘Final Approach’. Annex 11

Final approach That part of an instrument approach procedure which commences at the specified final approach fix or point, or where such a fix or point is not specified:
(1) at the end of the last procedure turn, base turn, or inbound turn of a racetrack procedure, if specified, or
(2) at the point of interception of the last track specified in the approach procedure; and ends at a point in the vicinity of an aerodrome from which:
(a) a landing can be made; or
(b) a missed approach procedure is initiated. (ICAO Annex 11)

Last edited by crossonagreen; 27th Aug 2019 at 21:28. Reason: original poster’s name added
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Old 28th Aug 2019, 09:50
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Originally Posted by Lissart
Blimey! So you were vectoring to Deconflict under DS in class G and now all you do is pass traffic! Is this progress...?
No, that is still not the case.

There's still the:

"Issue such ATC clearances as are necessary to prevent collisions and to expedite and maintain an orderly flow of air traffic."

So if you can see traffic, or have known traffic, you still have to make sure they do not collide. Like Chevvron says, 5 nm should be good enough.

You could argue that the required vertical/lateral separation minima does not apply, and you can go a bit closer, depending on the situation. But you'll still be held responsible if you let two known aircraft collide without acting.... Class E airspace will allow you to turn an IFR flight in this case.
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Old 28th Aug 2019, 10:00
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Originally Posted by crossonagreen
Lissart, You requested a definition of ‘Final Approach’. Annex 11

Final approach That part of an instrument approach procedure which commences at the specified final approach fix or point, or where such a fix or point is not specified:
(1) at the end of the last procedure turn, base turn, or inbound turn of a racetrack procedure, if specified, or
(2) at the point of interception of the last track specified in the approach procedure; and ends at a point in the vicinity of an aerodrome from which:
(a) a landing can be made; or
(b) a missed approach procedure is initiated. (ICAO Annex 11)
Agree, and the ILS approach for RWY08 seems to have a FAF at 4.4 DME, so until then the Falcon wouldn't be on final approach... I suppose
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Old 28th Aug 2019, 10:16
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Originally Posted by jmmoric
No, that is still not the case.

There's still the:

"Issue such ATC clearances as are necessary to prevent collisions and to expedite and maintain an orderly flow of air traffic."

So if you can see traffic, or have known traffic, you still have to make sure they do not collide. Like Chevvron says, 5 nm should be good enough.

You could argue that the required vertical/lateral separation minima does not apply, and you can go a bit closer, depending on the situation. But you'll still be held responsible if you let two known aircraft collide without acting.... Class E airspace will allow you to turn an IFR flight in this case.
5nm is the ICAO recommended minima; can be reduced to 3nm if both aircraft are identified and working the same radar unit.
In class A airspace the vertical separation minima against unknowns in the UK is 5,000ft, but that's not important right now.
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Old 28th Aug 2019, 13:35
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OK - perhaps it is time to re-focus the thread. Really useful contributions all round - thanks to one and all. It is always useful to revise a definition, or remind oneself of stuff one may not use every day. Not to mention benefitting from other people wisdom and experiences.

However, the thread is about ATSOCAS and their impending demise. There are 2 broad categories of airport who will be impacted by these changes as they currently provide ATC services in class G: those with radar and those without (procedural.) If we further confine our discussions to airports that have some or significant CAT flights, we are all agreed that the number 1 priority must be protection of these flights. In the first category we have for example, Exeter, Durham, Norwich, Newquay etc. In the second, Scilly, HIAL etc and others that may have radar but downgrade to APP during shoulder hours when a dedicated radar ATCO is unavailable. If you were responsible for the future airspace classification of these two types of airport, or were asked to comment as to how these businesses could respond to the possible threats that EASA changes pose to their operations, what would you be advising? Given that the CAA does not readily grant class D and this seems to be based on parameters such as passenger numbers (?) some if not all of these airports are not going to get D. (I believe - and I haven't checked due time - that the recent ACP for Exeter's class D was rejected...?) (Perhaps I have therefore answered my own question; the only solution left to them is class E!!!)

What are people's views on airspace classification changes and what service do you envisage being provided?
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Old 28th Aug 2019, 13:51
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Originally Posted by Lissart
OK - perhaps it is time to re-focus the thread. Really useful contributions all round - thanks to one and all. It is always useful to revise a definition, or remind oneself of stuff one may not use every day. Not to mention benefitting from other people wisdom and experiences.

However, the thread is about ATSOCAS and their impending demise. There are 2 broad categories of airport who will be impacted by these changes as they currently provide ATC services in class G: those with radar and those without (procedural.) If we further confine our discussions to airports that have some or significant CAT flights, we are all agreed that the number 1 priority must be protection of these flights. In the first category we have for example, Exeter, Durham, Norwich, Newquay etc. In the second, Scilly, HIAL etc and others that may have radar but downgrade to APP during shoulder hours when a dedicated radar ATCO is unavailable. If you were responsible for the future airspace classification of these two types of airport, or were asked to comment as to how these businesses could respond to the possible threats that EASA changes pose to their operations, what would you be advising? Given that the CAA does not readily grant class D and this seems to be based on parameters such as passenger numbers (?) some if not all of these airports are not going to get D. (I believe - and I haven't checked due time - that the recent ACP for Exeter's class D was rejected...?) (Perhaps I have therefore answered my own question; the only solution left to them is class E!!!)

What are people's views on airspace classification changes and what service do you envisage being provided?
Go back to one of my 'old' proposals.
For all airfields in Class G airspace with an approved iap, whether or not they have radar, civil or military, give them an ATZ of 5 nm radius up to 3,000ft agl. Present ATZ transit rules to apply.
This also gets rid of the stupid anomoly whereby a MATZ only applies to military aircraft.
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Old 28th Aug 2019, 15:24
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Not sure that would work, as those airfields will have to downgrade to FIS only, if remaining in Class G.

The options are basically either downgrade to FIS and therefore all traffic has to self position to airports in Class G, or if vectoring/sequencing is required, establish CAS.
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Old 28th Aug 2019, 15:49
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Originally Posted by Gonzo
Not sure that would work, as those airfields will have to downgrade to FIS only, if remaining in Class G.

The options are basically either downgrade to FIS and therefore all traffic has to self position to airports in Class G, or if vectoring/sequencing is required, establish CAS.
Yep, spot on those are the only choices. But just to clarify what you said: "if vectoring/sequencing is required" - or ANY other approach service which includes Procedural Control. There is no reason why APP cannot be provided inside CAS. Indeed, to my mind it makes more sense than doing it outside CAS IF (and only if...) there is a known traffic environment. This of course is a re-hash of the old argument as to whether providing an Approach service without surveillance equipment and only to KNOWN - or participating - aircraft is "safe". Or safe enough. The CAA by allowing APP in uncontrolled airspace believe that it is. I know of several instances where airlines carrying out their own risk assessments have concluded that it is not and have insisted on a radar service when operating in class G. So for both categories of airports - radar and non-radar - they will have to pay a lot of money to establish CAS or risk airlines getting pretty touchy about "only" being provided with a FIS. Given the reluctance of the regulator to sanction class D then this CAS they could establish will have to be E. The radar units can then carry on doing exactly what they are currently doing but pleasing EASA by calling it an ATC Control service. Ditto the procedural units but one might add that they might have missed an opportunity to have a more "known" traffic environment. If the class E route is taken, call it what you will but I see very little real change to the reality of the services currently being provided by what the UK chooses to call ATSOCAS. What am I missing - where is the real difference? Big winners? The consultancy firms carrying out the ACP's...…….
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Old 28th Aug 2019, 16:07
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Originally Posted by Gonzo
Not sure that would work, as those airfields will have to downgrade to FIS only, if remaining in Class G.

The options are basically either downgrade to FIS and therefore all traffic has to self position to airports in Class G, or if vectoring/sequencing is required, establish CAS.
Has anyone told the BGA?
They've made a lot of fuss about Farnborough's proposed CAS and are making a lot of fuss about Finningley's CAS too, so not only Farnborugh will require the airspace but Odiham too.
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Old 28th Aug 2019, 22:00
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Originally Posted by chevvron
Simple. If your unknown confliction is showing a '7000' squawk (indicating a/c not receiving radar service) and no altitude readout you vector your own traffic at least 5nm away from it to allow for an unpredictable turn by the unknown.
If it's showing an altitude readout then irrespective of what is set on the aircraft's altimeter which will always transmit an altitude based on 1013.2 hPa, if the altitude indicated on the radar display (which will have the current QNH dialled in to enable it to convert from 1013.2) is showing 3,000ft above or below your traffic then traffic information is sufficient; if it's less than 3,000ft then the above applies.
I've never worked in Class E airspace, only Class G but I would imagine you would take the above action in airspace of either classification.
This would be the case if the aircraft was under a deconfliction service, in the Bournemouth case the Falcon was receiving a traffic service and self positioning for the approach. The ATCO fulfilled their responsibility by passing traffic information and updating it as required. If the crew want deconfliction advice it is upto them to ask for it.
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Old 29th Aug 2019, 02:00
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Originally Posted by Pringle_
This would be the case if the aircraft was under a deconfliction service, in the Bournemouth case the Falcon was receiving a traffic service and self positioning for the approach. The ATCO fulfilled their responsibility by passing traffic information and updating it as required. If the crew want deconfliction advice it is upto them to ask for it.
It is not just up to the crew to ask for de-confliction advice; if you read my #41 above, you will see what the controller could have done under 'duty of care' to resolve the confliction rather than just sit there and watch it happen.
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Old 29th Aug 2019, 08:12
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Originally Posted by chevvron
It is not just up to the crew to ask for de-confliction advice; if you read my #41 above, you will see what the controller could have done under 'duty of care' to resolve the confliction rather than just sit there and watch it happen.
Agreed, noone is gonna come and pad you on the back, saying "good job", if there are 2 aircraft missing....
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