ferris, I still believe we are at cross-purposes.
yy said:
Originally Posted by
yakkity yak
Also, remember that there could be other aircraft in the vicinity cruising at altitudes and this could affect the integrity of TCAS if your mode C is using 1013 instead of QNH.
This is quite clearly incorrect as TCAS cannot be affected by a wrongly set altimeter. TCAS uses Mode C (or Mode S) to assess the vertical position of the other aircraft. Thus there is no way that "the integrity of TCAS" can be affected if QNH is set on the altimeter, rather than Standard, i.e. 1013mb. That was what I was referring to ...
By the way, my transponder
does give a visual indication of the Mode C data that is being transmitted (i.e. FL), so this data is
not necessarily invisible to the pilot, as you say.
I am reluctant to prolong this thread creep, so if you think I am still missing your point, please PM me ...
JD
