Based on the Tupolev Tu-4 airframe, in 1967 China developed an AWACS platform to try and enable them to monitor US Atomic tests in the Pacific. Powered by four Ivchenko AI-20K turboprop engines, the project was named KJ-1 and had a Type 843 rotordome pylon mounted above the fuselage. Trials were unsuccessful as the equipment was too heavy and failed to meet PLAAF requirements, the project was cancelled in 1971.