cpdlcads
On the 330/340 you can put ''aoa'' into the ACMS on MCDU 3 and this gives a direct readout of aoa typically 2.2 - 2.4 degrees nose up at fl 370 M.81. Now if only AB would copy that info to the PFD, and better still to a separate instrument on the instr panel....
Latest S/Ns have this:
"A backup speed scale and a backup altitude scale replace simultaneously the normal speed and altitude scales when all the three ADRs are switched OFF. This enables the flight crew to fly at a safe speed and altitude in case of an unreliable speedlaltitude indication.
The backup speed scale information is based on the angle-of-attack, and depends on the slatlflap configuration.
The backup altitude scale displays the GPS altitude."
FCOM 1.31.40 pg 32
Sorry, not able to post the image.