NSEU,
I see and understand your point, but my notes make reference to the wheel speed transducers as being the primary control input to the BSCU.
Interestingly I found a single sentence explanation for IRS input as follows.... "selected" IRS signals provide ground speed signals for hydroplane/touchdown protection (read into that what you may.)
Nowhere in my notes can I find any explanation if you lose IRS ground speed input. So I can only assume (and we all know where that can lead to) that the BSCU works its magic and only uses wheel speed input, considering that the wheel transducers are signalling the BSCU that they are on the ground and physically spinning up to speed where as the IRU's have zero input on wheel speed.
I also found that wheel speed only, enables antiskid at >8kts and disables at <8kts. Also agree on the body gear steer scenario.
McHale.
PS... We've gone a bit off topic, but still learning.