What must be actuated to release the door from its locked position on the ERJ 175?

The correct answer focuses on the gust lock mechanism. In the ERJ 175, the gust lock is specifically designed to secure the main cabin door in place when the aircraft is parked, especially in windy conditions. To release the door from its locked position, the gust lock must be actuated, allowing the main door to be opened safely.

This mechanism is critical for maintaining the structural integrity and safety of the door during flight and on the ground. The gust lock prevents any unintended movement of the door that could occur due to wind forces. Once the gust lock is disengaged, the other components, such as the main handle or assist handle, can then be used to actually open the door.

Understanding the function of the gust lock is essential for safe operation and compliance with procedures related to door operation in the ERJ 175 aircraft.