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Possible Answers:
OCAS.
Last seen on: LA Times Crossword 21 Jan 21, Thursday
Random information on the term “OCAS”:
The Obstacle Collision Avoidance System (OCAS) is designed to alert pilots if their aircraft is in immediate danger of flying into an obstacle. OCAS uses a low power ground-based radar to provide detection and tracking of an aircraft’s proximity to an obstacle such as a power line crossing, telecom tower or wind turbines. This capability allows the visual warning lights to remain passive until an aircraft is detected and known to be tracking on an unsafe heading. This leaves the nighttime sky free of unnecessary light pollution thus decreasing public annoyance issues while improving the environmental habitat.
OCAS is currently the only FAA approved Audio Visual Warning System (AVWS) approved in the National Airspace. OCAS is also the only AVWS approved by the International Dark Sky Association.
OCAS is operational in the US, Canada, Norway and Germany.
A terrain awareness and warning system is crucial in air transportation. The costliest plane collision – the 1977 collision of two Boeing 747s – did not happen in the air but on the runway at Los Rodeos Airport on Tenerife in the Canary Islands. Since then, accidents often occur on or near the ground involving planes and obstacles. OCAS has the capability to address the problem through its radar technology that detects obstacles so that an aircraft could be sent away to avoid collision. The system is related to other collision avoidance systems that work through a probability collision calculation, which involves “the relative trajectory between objects and the combined relative position-error probability density.”