What is done to attach the guard rails to the forward airstairs?

Attaching the guard rails to the forward airstairs is a systematic process that ensures safety and functionality during operations. Passing the guard rails to No. 4 is a procedural step that involves properly aligning the rails and securing them to the designated attachment points. This ensures that the guard rails are effectively positioned to provide adequate support and safety for passengers utilizing the airstairs.

By focusing on the correct alignment and attachment points, this option highlights an essential aspect of securing the equipment systematically, preventing accidents during boarding and disembarking. Ensuring that guard rails are passed to the appropriate attachment points is crucial for the overall integrity of the setup, allowing for a secure and stable environment for passengers and crew alike.

The other methods, while they may describe aspects of the attachment process, do not encapsulate the critical nature of proper alignment and sequential fastening that is vital for operational safety. This means that simply attaching in any order or addressing safety separately from the installation does not achieve the same level of operational readiness.