Question. As I have access to the flightdecks of the Allied Air Cago 727's, is there any physical way of checking the hexcode?
regards clive.
On some transponders it is hard wired pins on the back of the transponder that can only be accessed by pulling the transponder from its mounting
Page 85
http://www.neboservice.ru/docs/0216544001186664708.pdfThe aircraft Mode S address is a 24-bit binary code set at the
time of installation. The code is implemented in the aircraft
by strapping certain pins on the transponder interconnect.
Any MST 67A transponder installed in the aircraft after these
pins are strapped will adopt this address. This 24-bit address
is included in all Mode S transmissions as well as all
TCASII Mode S transmissions.
For others it can be reviewed on the transponder screen with power on and looking at certain MX pages on the transponder.
Look at page 11 onwards of this transponder manual
http://www.funkwerk-avionics.com/cms/upload/Downloads/Transponder/TRT600-200-12e-150_Install.pdfConclusion
It is unlikely you will be able to get the code by nosing around the cockpits without a qualified MX engineer