![]() ![]() If the field has pilot controlled lighting after dark, then the PAPI lights are probably attached to that system and will come on with the rest of the runway lights. ![]() At uncontrolled fields, the lights are left on 24/7. 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 airfields approach lights, runway edge lights, and taxiways via radio. The two circled "P"s are also standard symbols, but for PAPI (Precision Approach Path Indicator) lights - a set of four bicolor (red/white) lights that sit beside the runway and are aimed so that you can see if you're above, on, or below the glidepath based on the combination of red and white lights you see.Īs to the symbols being reverse (not boldened)? That means that those lights are hooked up to a PCL (Pilot Controlled Lighting) box that listens for sequences of microphone clicks on the airport control frequency (UNICOM/CTAF, or tower for a part-time towered airport) and turns on the lights hooked up to it for a set period of time when a suitable sequence is given by a pilot. At most towered airports, the PAPI lights and their brightness is controlled by the air traffic controllers. What you want is the Frontmatter to the Terminal Procedures Publication, and in particular the pages under "Approach Lighting System" - these document all the various permutations of visual approach aids found in the US NAS.Īs to the symbols you are specifically asking about - the "shell" is the standard symbol for an ODALS (OmniDirectional Approach Lighting System) that consists of two steady burning lights at each side of the runway threshold and five sequenced flashers leading down the extended runway centerline for 1500'. What does PCL mean in Unclassified This page is about the meanings of the acronym/abbreviation/shorthand PCL in the Miscellaneous field in general and in. ![]()
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