Russia has conducted a flight demonstration with its prototype PAK FA fighter for a delegation of Indian defence ministry and industry officials.
Indian officials inspected Sukhoi's lone PAK FA following the demonstration, which included low-speed passes and high angle-of-attack manoeuvres. The aircraft, which will be followed by two more prototypes before the end of the year, is pictured with new-look camouflage markings.
The new fighter programme is a topic of discussion by an Indo-Russian commission for military industrial co-operation, along with another to produce a multi-role transport aircraft with a 20t payload capacity.
New Delhi is insisting on executing both programmes as joint ventures, with equal sharing of investment and workshare.
Russia's air force has a requirement for 250-300 next-generation T-50 fighters to enter use from 2015-16, while India plans to buy between 200 and 250 of the joint design. This should use a common airframe and engines, but have its on-board systems and weapons tailored for their individual needs.
First flown in January, the PAK FA prototype is intended to de-risk features such as the use of low-observable materials and thrust-vectoring engines with supercruise performance, plus internally carried weapons.
Russian sources suggest a pre-production batch of between six and 10 aircraft will be built to support future testing of the type, with the nation's air force expected to launch operational trials in Lipetsk around 2012-13.