What does the CC function check related to the Flight Deck Door?

The CC function primarily checks the access code functionality related to the Flight Deck Door. This is crucial for ensuring that only authorized personnel can enter the flight deck, maintaining the safety and security of the aircraft during flight. Access codes are a key component in the security measures designed to prevent unauthorized access, and the CC function ensures that these codes are working as intended.

While other aspects like air pressure in the cabin and the door closing mechanism are important in their own right, they are not specifically what the CC function is designed to monitor. Similarly, security lock integrity is a vital element of the overall security of the flight deck door; however, it is not the focus of the CC function in this context. This distinction makes understanding the role of the CC function essential for recognizing its importance in aviation security protocols.