How many personnel can safely be on the airstair at one time?

The correct answer regarding how many personnel can safely be on the airstair at one time is based on safety regulations and practical considerations in aviation operations. The guideline typically allows for a specific number of individuals on the airstair to ensure stability, safety, and effective handling of emergencies.

In this context, having three personnel on the airstair allows for enough individuals to assist with the boarding or deplaning process while maintaining an appropriate safety margin. This number can help ensure that each person has the necessary space to maneuver without risk of losing balance or causing instability on the stairway.

Additional personnel beyond this number may lead to overcrowding and increase the risk of accidents, such as slips or falls, particularly in inclement weather conditions or during high-traffic situations. Thus, the guideline of three personnel is designed to maximize safety and efficiency during boarding and deplaning operations.