Honda began developing its own small turbofan engine, the HF118, in 1999, leading to the HF120. The HF120 was test-flown on a Cessna Citation CJ1.[73] The engine features a single fan, a two-stage compressor and a two-stage turbine. The GE Honda HF120 received FAA type certification on 13 December 2013,[74] and production certification in 2015.[26][4]