▁of ▁the ▁I kar . ▁S 5 . 2 0 5 ▁Or bit ▁Cor re ction ▁Eng ines ▁S 5 . 4 : ▁Li qu id ▁engine ▁burning ▁T G - 0 2 ▁and ▁A K 2 0 F ▁in ▁the ▁gas ▁generator ▁cycle . ▁U sed ▁to ▁de or bit ▁V ost ok , ▁V os kh od ▁and ▁Z en it . ▁S 5 . 3 5 : ▁Back up ▁engine ▁of ▁the ▁K T DU - 3 5 . ▁S 5 . 5 3 : ▁Or b ital ▁correction ▁engine ▁for ▁the ▁lun ar ▁version ▁of ▁the ▁So y uz . ▁S 5 . 6 0 : ▁Main ▁engine ▁of ▁the ▁K T DU - 3 5 . ▁S 5 . 6 6 : ▁M ane u ver ing ▁engine ▁version ▁for ▁the ▁Sal y ut ▁ 1 ▁and ▁Sal y ut ▁ 4 ▁stations . ▁Also ▁was ▁composed ▁of ▁primary ▁and ▁secondary ▁engines . ▁S 5 . 7 9 : ▁Press ure - f ed ▁ro cket ▁engine ▁burning ▁N 2 O 4 / UD M H . ▁U sed ▁as ▁the ▁main ▁orb ital ▁engine ▁of ▁Sal y ut - 6 , ▁Sal y ut - 7 , ▁Mir ▁Core ▁Module ▁and ▁Z vez da . ▁Prop ulsion ▁Mod ules ▁K T DU - 3 5 : ▁Li qu id ▁ro cket ▁engine ▁burning ▁U DM H ▁and ▁A K 2 7 I ▁in ▁the ▁gas ▁generator ▁cycle . ▁U sed ▁on ▁first ▁generation ▁So y uz ,