Tuesday 18 June 2013 06:05 UTC
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Quick question on Transition altitudes. How do you find out what the transition altitude is for an area? I know that in some parts of the UK the TA is 3000' and in others it is 6000'. Is there a chart somewhere showing the transition altitudes across the country or is it just a case of asking the local ATC in the area?
If you are stuck with just your half mill, you can take an educated guess by looking at the base of controlled airspace, if there is some in the area you are considering.
If the base is shown as an altitude, then you know that the TA is at least that. Outside and away from under any TMAs and CTAs, it is likely to be 3000'. If you are in CAS, ATC will tell you what to fly at, whether it be an FL or an altitude.
Sent from my high horse
It wouldn't be useful to show it. If the base of controlled airspace is shown as an altitude, it's below the TA. If it's a FL, it's above TA. If you're in controlled airspace, you just use the altimeter setting the controller tells you to.
OK, technically speaking when flying IFR below the East Midlands CTA where the base is FL75, you are not required to use the quadrantal rule when below 6000 ft. But for all practical purposes, you might as well fly quadrantal FLs, unless you're talking to East Midlands.
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