What is the first step in closing the MCD on the ERJ 175?

The first step in closing the MCD (Main Cabin Door) on the ERJ 175 involves verifying that the sill is free from obstructions. This is crucial because any objects or debris on the sill could prevent the door from closing properly or could create a dangerous situation during takeoff or landing. Ensuring that the area is clear allows for a secure closure, which is essential for the safety of the cabin and passengers.

Following this verification, the subsequent steps can be performed to close the door safely. While pulling the door closed, grabbing the assist handle, and actuating the gust lock are all necessary actions during the closure process, they must only be executed once it is confirmed that the sill is clear of any obstructions. Thus, this verification step is foundational to ensuring a secure and appropriate door closure on the aircraft.