Russian PD-14 Engine for MC-21 Airliner passes ICAO Emission Certification Test Our Bureau 2494 PD-14 engine made by United Engine Corporation (UEC) The PD-14 engine designed to power Russia’s MC-21 airliner has cleared emission tests conducted by the International Civil Aviation Organization (ICAO). The corresponding addition to the PD-14 type certificate was received by UEC-Aviadvigatel, United Engine Corporation (UEC) said in a statement. PD-14 was first certified by the Federal Air Transport Agency in 2018 and at that time complied with ICAO standards. In January 2020, a new international standard came into force, in which the smoke and emission standards of non-volatile particles were changed - this required additional certification, UEC said.