Transponder ALT reporting on or off in B777?
In some airports they required to turn ALT reporting on on the ground.
But in B777 the ALT reporting (mode C) is inhibited on ground even we set the selector knob to XPDR position(FCOM)
so how can we comply with this?
On the otherhand some airport required to select ALT reporting off during ground movement but do the mode S still send the aircraft altitude out or not
or just even inhibit altitude reporting in mode C only?