...well, you
cannot tell from this that each FPV is fed by onside ADIRS...that's my point. So where this info comes from.
Actually, I would be grateful if you have it. I don't wanna dig into AMM
FCTM extract:
The FPV is computed from IRS data, therefore, it is affected by ADIRS errors.
An error may be indicated by a small track error, usually of up to ± 2°. This
can be easily determined during the approach.
The FPV is also computed from static pressure information. Therefore, the bird
must be considered as not reliable, if altitude information is not reliable.
EDIT: I got it: Vol 1.34.10 page 1 ADIRS schematic.
That's right, in normal ops, ADIRU1=>...=>FPV1, respectively ADIRU2...