Hi blondeontour,
You said, "... as well as fatigue of f/as..how do they know that the f/a is capable of doing thier primary role when they are knackered???"
To give you an example of how seriously management take fatigue risk management, a colleague of mine sent in a letter to the OHS Committee on the subject. The reply from management (which he showed me), said that since the duties (eg 8 sector days) are within the terms of the EBA, they are not deemed arduous!
I'm sure everyone will agree that a piece of paper doesn't determine whether someone is tired as a result of a long duty. Fatigue is determined by how one feels.
Just an example of how management trivialise and belittle our concerns.