Originally Posted by
dn_wisconsin
For extra points.......check out your cockpit pictorial and find the alternate PFD display for aircraft 607NK and subsequent (maybe 605 and subsequent). What's the BUSS and when would it come up?
605 and beyond. It's called "AOA mode" and is just that, a red/green/red fast/slow indicator and GPS altitude. Could save your ass with unreliable airspeed; easiest way to get there is turn all three ADR PBs off.
Of course, this mode won't do much for you with frozen AOA vanes...