Originally Posted by
binbrook
Slight thread drift, but when did TA come down to 3000ft? AFIR in the 50s it was up at something like 10000ft. Below that we were all on QNH - no QFE even in the circuit - which meant mental arithmetic for BABS/ACR7 approaches.
Thank you Binbrook; that's what I suspected and why I queried the depiction of ASRs on the IFR airways chart; there would be no need to depict the ASRs if the TA was 3,000ft as everybody would be using ISA.