ACRP Report 148: LED Airfield Lighting System Operation and Maintenance provides guidance for operating and maintaining light-emitting diode (LED) airfield ground lighting systems, including taxi guidance signs, elevated light fixtures, and in-pavement light fixtures. The guidebook will be of particular interest to airport operations and maintenance (O&M) practitioners seeking to maximize the potential O&M benefits that LED lighting offers as they integrate and/or replace older airfield lighting with this new technology.