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The I.S.T. XL-15 Tagak (Swan in English) was a single-engine, twin-boom, high-wing monoplane designed after the I.S.T. XL-14 Maya and built in the Philippines in the mid-1950s. The result of a collaboration between a Government research institute and the Philippine Air Force, it was designed as a utility, liaison or ambulance aircraft and as a test bed for the use of local materials in aviation.