Hi guys,
Thanks for your responses.
Originally Posted by OPEN DES
And is there any barometric input to the Flight Path Vector?
Yes, according to BEA's Interim Report no.2 on AF447, 1.6.11.2:
The FPV is elaborated in the IR part of the ADIRU which, for this purpose, uses inertial parameters and also an anemometric parameter: the barometric vertical speed.
So I take it that the PFD display of V/S is barometric, and needs to be corrected for temperature difference from ISA to obtain geometric V/S.