For those interested, this Archer used for IFR training has
It also has DME and ADF.
So add a GNC355 to any plane with a NAV/COM and you are IFR equipped.
I wasn’t aware of that.
Airborne_Again wrote:
By the general rules, yes. But if the POH has an limitation that two are required, then unfortunately that is what you need to have. Unless someone makes a “Single COM STC” for the DA40.
Interesting questions.
It could well be that there is no particular law that requires abiding by the OEM POH limitations. This should be seen in the sense that it is admissible to fly with less than OEM stated POH equipment as long as the law is followed (e.g. NCO.IDE).
Or, to the contrary, since “Operating Limitations” is authority approved data, it could be tough luck and one has to follow the OEM POH equipment requirements even though it is more restrictive than the law.
Would be nice to know the answer…
Ibra wrote:
VOR has future at the end of the tunnel, from Guernsey AD AIP‘in IMC, flight to Guernsey by aircraft not equipped with VOR will be by prior permission only.’
Being a ground-based facility, I don’t know of any aircraft equipped with VOR. If so, it would definitely be a moving VOR. I personally wouldn’t want to trying navigating by reference to it! 
