What is the first duty to be completed when closing the MCD on the ERJ 175?

The first duty to be completed when closing the Main Cargo Door (MCD) on the ERJ 175 is to verify that the sill is free from obstructions and that the caution strap is stowed. This step is crucial because ensuring the sill area is clear prevents any potential damage to the aircraft or injury to personnel during the door closure process.

By checking for obstructions, you ensure that nothing is interfering with the door's operation, which could lead to malfunctions or hazards if the door were to close improperly. Additionally, stowing the caution strap is important because it helps to keep the area clear and prevents it from getting caught in the door mechanism as it closes.

Completing this verification first helps establish a safe working environment and is consistent with standard operational procedures that prioritize safety and efficiency. Other steps, such as pulling the door closed or actuating the gust lock, are important but come after ensuring a clear and safe area for operations.