Two ADC config

[ASCTU744]

After flying the IAS disagree situ I noticed that the A/T disregarded my new (reliable) ADC source selection, on the 3 ADC config the A/T doesn't do that. Is this normal for the 2 ADC option?

[Hardy Heinlin]

What's the name of the situ?


Edit:
Did you activate the malfunction "Pitot failure - Capt"?

[ASCTU744]

Yes exactly, training 704 Takeoff D

[Hardy Heinlin]

The selected ADC on the AIR DATA selector provides air data to the captain's PFD and IRU L. This is not directly related to the autothrottle or autopilot.

When the captain's pitot provides an incorrect IAS to ADC L (which also affects CMD L and the A/T), you need to select FCC R on the FLT DIR/PVD source selector and you should not select CMD L or C (select CMD R or no CMD). This way, the A/T gets data from ADC R which is connected with the F/O's pitot.