Originally Posted by
Mahatma Kote
O.K. Serious question for 777 Avionics Techs.
Is it possible to alter the ICAO unique airframe code in the transponder using pilot available menus; or engineering menus using pilot accessible equipment?
While there is an MAT (maintenance access terminal) in the cockpit, in order to change the airframe code, there are 2 prerequisites - one, the Air/Ground logic must indicate Ground and two, new ID data is uploaded only via disk file which is created by a GBST software package - something a pilot is not going to have access to - usually the operators are dispatch and maintenance.