CaptainFlash
"The fact you cannot fit or run a transponder should not give you a green card to exercise the rights of those that do . . ie transit class D airspace.
In my opinion if you don't have a transponder . . .you should not be in Class D. This irrespective of whether you can or can't have it fitted!"
Let's just look at this for a minute. There are a number of small airfields within Class D - some within Class A (almost) and they have functioned perfectly safely for some years with non-radio/non-tx aircraft.
All have approved exit/entry routes and arrangements with the local ATC service. None of the local ATCOs, as far as I am aware, have any concerns about this.
The same thing goes for transiting such airspace. If an aircraft, such as the D9 I used to fly, is radio-equipped (actually, an Icom), but has no transponder, I would call the local service and tell the ATCO where I was and where I was going. This would be relayed to other aircraft and I would expect these pilots to watch out, just as I would be looking out for them.
It happens in Class G all the time, so what is the issue with Class D?