Fuji, every country has a different matrix of required equipment carriage versus airspace category versus flight rules.
The equipment list for each country is in the country's AIP GEN 1.5.
If you like opening cans of worms, try this one
Sweden needs an ELT. There's a good one
Almost nobody reads this stuff, and I bet there is a huge amount of "illegal" public transport, and I am talking about big jets especially 3rd world cargo ops. The big passenger carrying ops will have the whole lot I am sure; probably carrying
two ADFs to do the Russian dual-NDB approaches.
Bose-x, do you have a reference for the ADF going away for enroute IFR in the UK in 2008? IHMO, when it goes it goes but it doesn't go until it goes. It was "about to go" 5 years ago. If the CAA really wanted it to go they could do that tomorrow, with an AIC.