Our Customers (original) The PCU100 Protocol Converter airborne installations include the following types of aircraft: C-130, CN-235, A319, AT-63, KUH-1, S-3B, F-5N and H-60 Our 1553 to 429 converter customers include the following: Marshall Aerospace of Cambridge, UK Naval Air System Command NASA – Glenn Research Center RDAF – Royal Danish Air Force Korea Aerospace Industries Indonesian Aerospace Lockheed Martin Aircraft Argentina / Fabrica Argentina de Aviones