Ralf. A quick Google search has brought up these sites which may be useful to you......
http://www.deafpilots.com/
http://www.faa.gov/AVR/afs/deaffaq.htm
http://www.aopa.org/whatsnew/newsite...990624dpa.html
I have no idea if it's possible but could you fly with someone with full hearing if they have a licence to operate a radio?
Hope this helps.
