Roy Smith wrote:
In article bravf.7872$V.454@fed1read04, wrote:


Although that is certainly a likely result in a light aircraft, it may
not be in an aircraft with more sophisticated avionics busses.


Well, there is always the human factor.

I remember one night I was up shooting practice approaches, when NY
Approach was calling out 757 traffic to everybody, along with the warning,
"he's not talking to anybody". I can only assume somebody in the cockpit
fat-fingered a frequency change. Being on the wrong freq is effectively
lost comm. It's probably something which you'll be able to resolve
eventually, but when you get to the fix and you're not talking to the guy
who gave you the paper stop, you've got to figure something out.

Human factors, or not, that makes my case: i.e., a sophisticated
aircraft can easily loose comm yet still have full nav capability.

Airliners often lose comm in the manner you mention, albeit a transient
loss of comm (until the company SELCALs them ;-)