A highly upgraded variant of the AL-31F, the AL-41F1S is related to the Su-57's Saturn AL-41F1 (izdeliye 117), differing primarily in the engine control system. The Su-35 is powered by a pair of Saturn AL-41F1S turbofan engines, formerly known as izdeliye (Product) 117S. For the purpose of defending against enemy tracking, the Su-35 is equipped with the L175M Khibiny-M electronic countermeasure system, while engineers have applied radar-absorbent materials to the engine inlets and front stages of the engine compressor to halve the Su-35's frontal radar cross-section and minimize the detection range of enemy radars. The aircraft is equipped with an OLS-35 optoelectronic targeting system ahead of the cockpit to provide other forms of tracking including infra-red search and track. It is capable of detecting an aerial target up to 400 km (250 miles) away, and can track thirty airborne targets and engage eight of them simultaneously in addition, the multi-function radar is capable of providing high-resolution images of the ground using synthetic aperture mode. The Su-35 employs the powerful N035 Irbis-E ("Snow Leopard") passive electronically scanned array (PESA) radar, which is a further development of the N011M radar that had been evaluated on Su-27M test-beds and constitutes the core of the Su-35's weapons-control system. The commander of the air force also emphasized that the final decision on purchase of Sukhoi Su-35s from Russia rests with the Army and the Armed Forces General Staff Headquarters. “This issue is on the agenda and we hope to be able to get these 4++ generation fighters in the future.” He said the purchase of Sukhoi Su-35 is currently being discussed, rather than Sukhoi Su-30. Vahedi announced that purchase of Sukhoi Su-35 fighters from Russia is on the agenda of the air force. TEHRAN - Brigadier General Hamid Vahedi, commander of the Iranian Air Force, told Borna news agency on Sunday that Iran is seeking to purchase fighter aircraft.
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