Originally Posted by
PelicanSquawk
Thanks for this. I’ll probably just fly overhead Cambridge any way. I was more just curious about what height you can safely assume an instrument track isn’t going to be an issue. I guess in every scenario you should be talking to them any way.
It's a good question but a tricky one to answer. For typical conventional procedures, you'll cross both the outbound and inbound legs. As an example, the platform altitude for the ILS23 at Cambridge is 1700 ft, so you can expect inbound traffic to be not below that level until it has intercepted the glideslope at about 5 miles on extended centreline. On the outbound leg, which you'll also cross, aircraft may be descending to about 2000 ft from much higher levels, though most usually from about 3000 ft. If you talk to Cambridge Approach, they will be able to advise you as to any instrument traffic, and unless there's a conflict they shouldn't object to an early call to Duxford to out out your join.
You can find
Cambridge approach plates in the AIP.