Very interesting so far, thanks!
Since AI revised the Landing Distand Calculation procedure in case of Systen Abnormals (~ 2 yrs ago?), we changed our QRH respectively. These are the Factors for IR 1+2+3 Fault on DRY/WET/CONT Rwys:
A319: 2,55 / 1,95 / 1,55
A320: 2,60 / 2,10 / 1,70
A321: 2,45 / 2,00 / 1,55
An ADR 1+2+3 Fault gives a Factor of 1,35-1,25 on any airframe, so 2,xx seems totally out of place and closer to EMER ELEC or a double HYD Failure where your left with close to nothing in terms of braking.
As we don't us AI FCOMs/FCTMs we also don't have above mentioned procedurer available.
I requested clarification from our training dpt, however any further advice is duly appreciated.
Take care,
MAX