Quote Svarin:
Reading the ALTN LAW / DIR LAW schematic, I still have a bucketful of questions, all germane to our thread subject. Some of them are :
are all switching to ALTN LAW combined with an AP disconnect ?
is there any condition where the aircraft would switch to ALTN LAW and continue AP operation ?
Svarin,
No, reversion to Alternate Law is not always combined with an autopilot disconnect. Many situations will trigger both, but some do not. A significant example would be the Emergency Electrical Configuration where, with the aircraft in Alternate Law, AP2 remains available until the Land Recovery pushbutton is selected. This is done during approach to recover some of the aircraft functions that are necessary for landing that are not required during cruise flight. In order to maintain within the minimal capacity available from the emergency generator or batteries other functions that are non-essential to the approach and landing are depowered and amongst those is AP2.
ELAC