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Reference.org
Pilot-controlled lighting
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<p>Pilot-controlled lighting (PCL), also known as aircraft radio control of aerodrome lighting (ARCAL) or pilot-activated lighting (PAL), is a system that allows aircraft pilots to control the lighting of an airport or airfield's <a href="/facts/Approach_lighting_system/UpL3aDyB">approach lights</a>, <a href="/facts/Runway_edge_lights/uIPqo766">runway edge lights</a>, and <a href="/facts/Taxiway/yrDJmILk">taxiways</a> via radio. </p>