My question is should the radio(s) (I would imagine there are more than one) become unserviceable what are the available (by this I mean not just happening to have a vhf or cell phone handy) options for declaring an emergency - if any - or is it you proceed with caution relying on ATC to be on the ball and clear the path?
- there is a transponder code for comm failure and
- if the crew doesn't answer, ATC will assume comm failure anyway
- at some airports VORs and ILS transmitters can be used by ATC for R/T
hope this helps.