The Progress D-436 is a three-shaft high by-pass turbofan engine developed by the Ukrainian company Ivchenko-Progress. It was initially developed to meet the requirements for late versions of the Yakovlev Yak-42 and the Antonov An-72 in the 1980s. The engine first ran in 1985 and was subsequently certified in 1987. Several variants have been developed and are currently in service with a variety of aircraft.
The D-436 engine was developed as a follow on to the Lotarev D-36. The engine took several of its designfeatures from that engine and another Progress engine, the Progress D-18. The D-436 incorporated an updated, higher RPM fan, a lower emissions combustor, and new compressor sections. Several variants of the engine incorporate a FADEC.
Variants
;D-436K
The "K" variant was the initial model of the engine. It had a bypass ratio of 6.2 and a pressure ratio of 21.0. Proposed for use in the defunct Antonov An-71
;D-436M
The "M" variant was proposed for use on the Yak-42M.
;D-436T1
The "T1" variant is used on the Tu-334 and has been offered for use on the in-development Tu-414. See detailed specifications below. The variant was also proposed for use on the now-defunct An-174.
;D-436T1-134
The "T1-134" variant was proposed as a replacement for the engines on the Tu-134
;D-436T2
The "T2" variant is uprated to of thrust and is used on the Tu-334-100D and the Tu-334-200D.
The "T3" variant added a booster sectionbehind the new wide-chord fan and had a maximum thrust around. The T3 variant was also considered for the Il-214, but the aircraft's thrust requirements exceeded the max engine thrust of.
;D-436-148
The "-148" variant was developed specifically for the An-148. This version is derated to of thrust for longer engine life
;D-436TX
The "TX" variant uses the same core at the "T3", but includes an updated turbine and a geared fan. It is in the class.
Derivatives
;AI-436T12
This derivative engine was designed for use on the Irkut/Ilyushin MC-21. It was projected to produce of thrust. Irkut has since replaced the AI-436T12 with the Aviadvigatel PD-14.
