Loadman,

Thanks for the help. I have tracked the error: for some weird reason the switch icon on the 2D panel doesn't change. If I click the bleed air valve switch on the 2D panel, nothing seems to happen, however, in the VC, the switch is activated! Next, if I do the procedure in the VC, all works fine, and the switches on the 2D panels are reflecting exactly the status of the switches in the VC.

Regards,

Hugo