81.What is the main function of the APU ?

580.In manual mode ,warnings and indications come from:

579.Motor 3 is controlled from:

578.Which interfaces are used for prepressurization and pressurization sequence initialization?

577.What happens if the MODE SELECTOR is set to MAN and the DITCHING pusbuttom is set ON?

576.Where do you check tje correct Manual landing elevation setting?

575.What is the maximum normal cabin altitude for maximum cruise level(39000Ft)

574.Which motor is controlled from the cabin pressure panel?

573.What is the purpose of the safety valves?

572.What happens when manual mode is used?

571.What is the number of outflow valves and safety valves?