MikeJ
You are correct - this is 100% legal - in a G-reg including outside the UK where not prohibited in the local airspace.
FAR 91.175 appears to make it illegal in an N-reg, but it is legal to descend to MOCA so IOW you can fly a DIY IAP down to 1000ft.
mm_flynn
I am not sure where "controlled airspace" comes into this. Also, I have never seen legislation which says you have to have an ADF to fly an NDB approach. Common sense tells us you should, but that isn't the law
AFAIK. You do have to have an ADF for IFR in CAS so in effect you would need an ADF to fly an NDB approach to an airport in Class D, but what about an airport in Class G??
Loads of people fly NDB approaches with a duff ADF - a duff ADF is probably the most common piece of avionics in rental spamcans
