A number of Cirrus flight plans have apparently been seen with the note 'ADF inop'.
I've heard rumoured the reason in some cases is that it's not actually installed, but owners feel that filing IFR with this on the FPL somehow covers them. A technicality now as the CAA are removing ADF from the relevant carriage requirement in the ANO.
Maybe, until EASA come round to the pragmatic solution we shouldn't shout too loudly and just get on with it?
Sir George Cayley