Who checks the "emergency access code" to unlock the flight deck door?

The emergency access code for the flight deck door is primarily checked and managed by the cabin crew, specifically the No1 check, which refers to the senior cabin crew member responsible for cabin safety and operations. This individual is trained to ensure that they have the most up-to-date and correct information regarding access codes for emergencies, which is critical for maintaining security and safety protocols on the aircraft.

While the flight crew may be aware of their own security measures, and the first officer has responsibilities regarding various operational aspects, it is ultimately the No1 check who takes charge of ensuring that the protocols for emergency situations, including accessing the flight deck, are correctly followed. Ground staff do not have access to this code, as their role is separate from the flight and cabin crew's direct management of in-flight security.