On a flight from Albany to Chicago everything was going well. The changeover to the various agencies was achieved by pressing the 1 key and auto replies to all instructions occurred as planned. Once on the ILS approach to Rwy27L I was instructed to contact tower. I pressed the 1 key as usual but this time all I got was Not Applicable. I selected the same tower frequency on the radio pedestal but then had no way to "speak". I completed the rest of the approach with RC4 telling me to contact tower until I exitted the program.Is there a way to manually select frequency and talk should RC4 give up the ghost?Peter

never heard of this one. unless your keyboard failed, something else stole the "1" key from me. is it a wireless keybard?instructions on how to send a .log are pinned at the top. see if you can duplicate the error, and send me the .logwhat was the tower frequency?jd