Now look guys. The FD and AP are independent systems which take information from the relevant sources and then compute what needs to be done, if this is not the case then losing the FD will cause the AP to fail.
Now that's not sensible is it??
So neither follows the other but they should agree.
..and before anyone says, "There's only one AFDS computer" have you actually looked inside and seen that the FD and AP circuits are seperate and independently redundant.