What is required before boarding/disembarking starts with the airstairs?

Before boarding or disembarking begins with the airstairs, it is essential that the guardrails must be secured. This is crucial for the safety of passengers and crew as it prevents any accidental falls during the boarding and disembarking processes. Guardrails provide a necessary barrier that ensures individuals using the airstairs have stability and are protected, particularly if the steps are crowded or if there is any movement of the aircraft. Securing the guardrails serves as an important safety measure that must be adhered to before allowing passengers to use the stairs.

While checking handrails, clearing the area, and ensuring airstairs are locked are all important safety practices as well, the specific requirement that guardrails be secured is paramount to prevent potential accidents during this transition phase.