In what order should arming/disarming be performed on the ERJ 175?

The arming and disarming of the emergency exit doors on the ERJ 175 should always be performed in a specific order for safety and procedural consistency. The correct order is primary followed by secondary.

When arming or disarming the doors, the primary door—which is typically the door that is used most frequently or has primary responsibility during evacuations—is addressed first. This ensures that in the event of an emergency, the critical door is ready for operation before dealing with additional exits. Following the primary door, the secondary door is armed or disarmed to complete the process safely. This structured approach helps cabin crew maintain order during boarding, deplaning, and handling emergencies effectively.

Choosing any other option, such as arming/disarming the secondary door first or simultaneously, could increase the risk of confusion or mishandling during critical times. The procedure is designed with safety in mind, ensuring that crew members and passengers are protected by following standardized protocols.