The McCarty and Heideman Air Safety Enhancement Act directs the Federal Aviation Administration to review and update its regulations and policies concerning low-altitude airspace safety within six months of the bill's enactment. The review will focus on whether current FAA rules adequately require marking and lighting of temporary obstacles like slacklines and wires, whether the agency can improve how it shares obstacle information with pilots through flight planning tools and avionics systems, and whether coordination with federal land management agencies should be enhanced. The bill requires the FAA to consult with helicopter operators, air medical services, general aviation pilots, agricultural aviation operators, and other aviation safety experts during the review. If the FAA determines that existing policies are inadequate, it must update its regulations and guidance within one year of enactment. The administrator must also brief Congress within 90 days after completing the review with findings and any legislative recommendations to improve low-altitude airspace safety.