The Ivchenko Progress D-36 (also known as Lotarev D-36) is a three-shaft high bypass ratio turbofan currently produced by the Ukrainian Motor Sich company.

The engine has a single-stage fan with 29 titanium blades and a Kevlar outer shell, which is driven by a three-stage turbine.

The most recent upgrade (after the Soviet breakup) is Series 4A which has been in manufacture since 2002.

Improvements included updated curved titanium blades and a built-in reverse thrust device.

More advanced blade design along with proprietary wear-resistant and heat-protective coatings have resulted in improved specific fuel consumption (kg/h/kgf) dropping from 0.65 to 0.63.