Originally Posted by
skyxbomb
I didn't even think about the ISIS. Just thought if two PFDs are 20-30 off from each other, then it would be an interesting approach guessing which speed to follow especially with crappy wx.
Even without the isis if you loose all 3 airspeed indicators by some act of God inflight just go flaps 45 on the approach 63 ish % N1 and you'll be within about 5 kts of ref 99% of the time on a 3 degree slope in the -200. Add 1% N1 for every 100 lbs of flight attendant weight.
