I can see a couple of little issues before you can even see the code in the FMS.
Bluetooth operates in the 2.4Ghz band and WiFi in the 2.4 Ghz and 5Ghz band, ADS-B operates at 980 & 1080Mhz, so a standard Andoid device can't even see the ADS-B signals.
I suppose if your really clever you could hack the 3G chipset to see and transmit to ADS-B, but this is 'secret squirel' stuff and beyond the capability of people without an indepth engineering background.
You could use 3G to connect to a ground based server and then transmit from an ADS-B system back to an aircraft, but you would need to know the aircraft UID.
Once your talking 'ADS-B' you then of course have to make sure your 'errant data' is not filtered out as being invalid, the you have to have a data path to the FMS, again make sure the data is not filtered out, have direct access to the code, and subroutines, and be able to lock and re-write code on the fly (pun intended).
While none of this is actually impossible, It's beyond the capabilities of an Android device, and you would also need some pretty specific information.
Last edited by garrya100; 13th Apr 2013 at 23:36.