Which system guides an aircraft through the flight management documentation during approach?

The Flight Management System (FMS) is integral to guiding an aircraft through its flight management documentation during the approach phase. The FMS is an advanced navigation and performance management tool that helps pilots by automating many of the tasks associated with flight planning and navigation. It utilizes data from various sources, including waypoint information, airways, and procedural information, to effectively manage the flight profile, ensuring an efficient approach.

During the approach, the FMS provides crucial guidance by storing flight plans and enabling the aircraft to follow a defined route. It integrates with the aircraft's autopilot system, allowing for automated descents and turns, which enhance precision and safety as the aircraft approaches the runway.

While other systems, such as the Global Positioning System (GPS), contribute to navigation by providing location data, and nondirectional radio beacons (NDBs) serve as location references, they do not manage flight documentation in the same comprehensive manner as the FMS. The Aeronautical Information System, while important for information dissemination, does not actively guide the aircraft during approaches but rather provides essential information that can support flight planning and operations. Therefore, the Flight Management System is the correct choice for managing flight documentation during the approach.