Which door is primarily checked by No.2 during PDIs?

The primary responsibility of the No.2 crew member during Pre-Departure Checks (PDI) includes ensuring the L2 door is properly secured and operational. This is part of the crew's systematic approach to ensure safety and compliance with regulatory requirements before departure.

The No.2 performs a thorough check of the L2 door as it is critical to the safety protocols, including confirming that the door is closed and locked to prevent any risk of an inadvertent opening during flight. This role is vital in maintaining the integrity of the aircraft on the ground and ensuring the safety of all passengers and crew members.

By focusing on the L2 door, the No.2 contributes to a comprehensive safety check, allowing other crew members to focus on their respective responsibilities without overlapping in areas that could lead to confusion or oversight. The division of roles among the crew ensures that all critical safety checks are efficiently managed.