We had an an aircraft dispatched with ADR2 U/S according to the MEL.
During several sectors it was discovered that ALL characteristic speeds calculated by the FAC where way to low (by up to 20 knots!) because the AOA2-Signal was not used for compensation in this configuration and AOA3 seems to have been a bit 'off'.
While Engineering keeps on telling there wouldn't have been any implications, even in case of a GPWS-Recovery or any other a-floor-condition, afterwards there was a note added to the respective MEL-Chapter saying that 'characteristic speeds may be affected' and to make an entry in the log if differences of 8 knots or more are obeserved.
Regards, MAX reverse