QHN to STD from uncontrolled to CAS
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QHN to STD from uncontrolled to CAS
Hi.
I am flying IFR in UK, and my instructor told me that during a flight from Cardiff, flying at 5000 feet (so on QNH) when handoff to CAS (to join AirWay) I need to use STD. I do not understand because I am below the TA of Cardiff which is 6000’
any thoughts?
Jules.
I am flying IFR in UK, and my instructor told me that during a flight from Cardiff, flying at 5000 feet (so on QNH) when handoff to CAS (to join AirWay) I need to use STD. I do not understand because I am below the TA of Cardiff which is 6000’
any thoughts?
Jules.
5,000 will be below your cruising level if you are joining CAS, so just do what London ATCC tell you which will probably be 'climb to flight level XXX' or 'cleared to enter at flight level XXX' in which case you obviously switch to STD.
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Just to try and understand the situation a little more. You were on an IFR flight from Cardiff. Were you still inside the Cardiff control zone or control areas when you were instructed to change to the area frequency?
Or had you left Cardiff's controlled airspace?
Or had you left Cardiff's controlled airspace?
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I've just googled it. Definitely 6000ft TA within Cardiffs controlled airspace. It would be 3000ft outside CAS, hence my question regarding whether or not the OP was inside the Cardiff control area or not.
It's not immediately clear from the first post.
It's not immediately clear from the first post.
Cardiff ATC have small sections of en-route airway delegated to them at low level as well as their own CTR and CTA.
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When you leave airspace that is using an aerodrome QNH to fly on an adjacent airway, the mimimum cruising level on the airway will be published as a Flight Level, therefore you must change the pressure setting to standard and adjust to the relevant FL as per your clearance.
The minimum usable FL on the airway is determined by a table taking into account the Regional QNH, this ensures terrain separation.
Controllers will issue an appropriate level, just be aware when the pressure is low, your planned FL may not be available
The minimum usable FL on the airway is determined by a table taking into account the Regional QNH, this ensures terrain separation.
Controllers will issue an appropriate level, just be aware when the pressure is low, your planned FL may not be available
Chevron,
First of all I really respect a lot of the stuff you post so I don’t want to be quoting this out of context, so I will clarify it is simply as the poster appears to be new to IFR ops under training I just want to make a small nitpick.
I’ve almost been vectored into the side of a hill at Cardiff while in IMC so never blindly trust an instruction. Always query and satisfy yourself yup that makes sense.
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The MOD equivalent is derived in an entirely different way or at least was when we last had one at Farnborough which was 16 years ago.
I think some feather plucker at ICAO decided on the name change as there was a liklihood of some places in the distant future using exclusively ADS instead of radar to provide ATC; probably the same feather plucker who decided 'hectopascals' was a great word to use instead of 'millibars'and that if you only had a single 8.33 frequency in your FIR, then all frequencies (apart from those ending in one decimal place) must be referred to with 6 numbers.
Last edited by chevvron; 16th May 2018 at 16:35.
I’ve almost been vectored into the side of a hill at Cardiff while in IMC
It was in a light twin under training and was dealt with via a stern phone call so sadly no report. Looking back maybe not the best way of doing so but hey ho..
2 s
