What does the "A" in "A pages" refer to?

The "A" in "A pages" stands for "List of effective pages." This terminology is commonly used in technical documents, manuals, and regulations to specify a collection of pages that are currently effective and relevant for operational use. The purpose of labeling these pages as "A pages" is to provide a clear reference for aircrew and other personnel so they can easily identify which sections of a document they need to consult for the latest guidelines and procedures.

In the context of aviation and aircrew operations, having access to a current list of effective pages is crucial for maintaining safety and compliance. This ensures that all personnel are working with the most up-to-date information, which can affect flight operations, maintenance, and emergency procedures.