1. RAS and RIS are only available outside CAS.
2. Don't know. It's a question I have often asked about the London CTR. I suppose Class A gives more protection as VFR flight is prohibited (SVFR can still be approved). In Class D VFR flights can be authorised.
3. TMAs are variable (London/Manchester class A, Belfast class E and Scottish D&E!), CTAs are normally class A or D.
4. Semi-circular/quadrantal rules apply to all IFR flight above the transition altitude outside CAS unless complying with ATC instructions. In other words, inside CAS or when under ATC you may well be allocated different levels. However, as a controller, I would suggest it is good practice to comply with this rule whenever possible.
Standing by to be shot down!!
Last edited by Whipping Boy's SATCO; 30th July 2002 at 16:31.