Which item is a necessary component of the FAA-approved ALP?

The necessary component of the FAA-approved Airport Layout Plan (ALP) is the details of existing and proposed facilities and structures. The ALP serves as a crucial planning document that provides a detailed layout of the airport's physical configuration. It includes information such as runway lengths, taxiways, terminals, and other facilities that are vital for ensuring the safe and efficient operation of the airport.

Incorporating details of existing and proposed facilities enables the FAA to evaluate the airport’s development plans, assess compliance with safety regulations, and ensure that any new structures are appropriately integrated into the overall airport design. This level of detail is vital for effective management, future expansion, and maintaining operational safety standards.

The other items mentioned, while potentially useful for various administrative or operational purposes, do not constitute necessary components of the ALP as defined by FAA standards. A list of airport employees and a schedule of airport events and activities may serve more managerial or informational functions, and notification of construction deadlines might be relevant for project management, but none of these are essential to the formal specifications of an ALP.