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The Aviation Accidents Prevention and Investigation Department (Gabinete de Prevenção e Investigação de Acidentes com Aeronaves, GPIAA, "Office of Prevention and Investigation of Aircraft Accidents") is the Portuguese aviation accident and incident investigation authority. The agency is headquartered in Lisbon. It is subordinate to the Ministry of Public Works, Transport and Communications.
References
Aviation Accidents Prevention and Investigation Department Wikipedia(Text) CC BY-SA