Originally Posted by
tartare
...in addition to my question above - how would QF see this working - with apologies for very simplistic scenario below?
Captain and FO do take off, climb out and part of cruise - go to sleep.
SOs take over - monitor the aircraft for the middle of the flight.
Captain, FO wake up, do descent and landing?
QF requires either the Captain or FO to be on watch. The FO (in long haul at least) has a command endorsement on type, the SO doesn’t.