Lenta.ru had an informative piece on the PAK FA’s “second phase” engine yesterday.
It calls the “second phase” engine “Item 129” [Изделие 129]. Lenta also says the provision of the first “Item 129” engines will coincide with the first PAK FA or T-50 fighters entering the force in 2015.
It notes the “first phase” engine is “Item 117” or AL-41F1 [АЛ-41Ф1].
The AL-41F1 will be used in the prototypes and the first series models which will enter the Air Forces’ inventory in 2015. It has 19,334 lb. dry thrust, and 33,047 lb. with afterburners. It is equipped with a plasma ignition system, all-aspect thrust-vectoring control, and digital controls.
The Lenta piece says a less powerful variant of the AL-41F1 – the AL-41F1S or “Item 117S” – will be put on the Su-35S fighter. The AL-41F1S has an older digital control system and a little less thrust.
According to Lenta, not much is known yet about “Item 129.” It was announced earlier it will have increased thrust and greater fuel efficiency than the AL-41F1. “Item 129” will reportedly have 24,054 lb. dry thrust, and 39,566 lb. with afterburners. The newer engine’s also likely to have a longer service life.
Lenta adds a report from Sukhoy that it expects to finish prototype airframe testing either this year or next. In 2013, the Defense Ministry’s supposed to get 10 experimental aircraft for combat employment testing.