Due to the large number of criteria in the domestic certification framework, 78 engine assemblies were used in the full-scale tests MOSCOW, May 28. /TASS/. The United Engine Corporation (UEC, a Rostec company) has tested the PD-8 aircraft engine for the SJ-100 passenger jet in accordance with the strictest Russian certification framework requirements, the state corporation said. The aircraft engine's certification framework includes requirements for airworthiness and environmental protection,