2high2fast
I have often found when I'm on top that the cloud just keeps going up and before long I'm starting to worry about airways
Not really much to do with the thread but just a point to make! Many pilots could get into a situation which is threatening the safety of themselves and the aircraft.
In that situation you are the Commander of the aircraft and your decision of how best to recover from a bad situation over rides any rules or regulations or CAS!
Yes you will have to answer for your actions and yes you should inform the relevant ATC of your intentions but NEVER get into a situation where you crash due to say icing because 1000 feet above is clear air which also happens to be in an airway!
Declare your problem and what you need to do and you will be cleared there!
Pace