There is a code pad that unlocks the door in case the pilot(s) don't answer the requests to open the door via intercom. The code does not however unlock the doo

There is a code pad that unlocks the door in case the pilot(s) don't answer the requests to open the door via intercom. The code does not however unlock the door immediately but activate a light and a beeping sound inside the cockpit for 30 seconds. Within this time frame the pilots can either decide to open the door immediately or to overwrite the unlocking, which locks the door for 5 minutes. This is to prevent attackers from entering even if they threaten to kill the crew member and thereby pressured them to enter the code. If the pilots don't react during the 30 seconds the door unlocks.