The question is phrased a little wrong. It should have been u201cwhy isn't India inducting single engine fightersu201d.The answer to this question is based on some technicality and logic. Let's try and understand them one by one.Fail safe and Safe fail .These are two design process, especially used in aviation. Just go by the meaning of the word and you will understand.Fail safe - it is basically a type of design which is unlikely to fail, under the operating circumstances. So basically a designer says that this airframe will not fail till 1000hrs of flight time. Hence periodic maintenance is carried out and inspections reveal the nature of damage, if any. If damage is above tolerable limit then that airframe is retired so that it dosent lead to an accident. Means more money spent in inspections and decommissioning the equipment.If you analyse this, you can understand this design philosophy is costly and time consuming.This was the design philosophy used in single engine fighters.Safe fail - Now comes the other design philosophy, which basically caters for failures but in a safe way. In layman's terms, it's like if a thing has to fail then it does after giving telltale signs and has backup available. Eg- Ac with multi engine (you will never find a commercial aircraft with single engine). Basically the designer does not want any chance of failure as that you result in mass casualties. So now most countries are agreeing towards this philosophy so that fighter flying remains a safe bet..What I have explained in terms of design philosophy is from a very miniscule point of view. Offcource there is much more to it.Accident RecordWithout doubt it easily fathomable that single engine aircraft have higher accidents vis-a-vis multi engine. One of the most important accessory in an aircraft is the engine. If you got one that is servicialbe you will survive. So take a guess what happens when an engine flames out and there is no relight. Hence inclination towards safety.Air Staff RequirementsThese are those requirement that are put forward by the service to the OEM(MiG, Sukhoi,Daasult etc etc), as to what the county needs. It specifies the exact requirements, like no of engines, hard points, endurance etc. So the current trend is to give ASQR for twin engine fighters. That's why the competitors vying for the contracts (Russia/France) only submit twin engine fighter entries.The IAF and the world has moved towards multi engine fighters primarily because of above mentioned requirements. But still predominantely the requirement of safety outweighs any other requirement. This is the reason that during republic day parade at India Gate only multi-engine fighters are allowed to do flypast(did you know that). Because they don't want to compromise on safety of such a sensitive place.But during AF day fly past, even single engine fighters participate. As it's away from the heart of New Delhi.Mighty Fulcrum over India GateBision Enroute to HindonEven during the MMRCA competition the requirements were for twin engine fighters, however two companies did sport single engine fighters.Saab - GripenBoeing/Lockheed Martin - F-16INAlthough the fighters were great, in fact the Indian test pilots loved the Gripen. But both were not selected as the core issue was both being single engine. There were few other aspects also that resulted in non-selection, but this was the biggest criteria for rejection.Having seen the above mention fact, it can be gauged why Russia is not offering single engine fighters to us. Because they know we won't buy them. Additionally all manufacturers have started developing twin engine fighters only, the only exception being the F-35 (why it was meant as a single engine is a different topic in itself).Having multiple engine also gives following advantage1 Redundancy2 Load sharing for Engine driven components eg- fuel pumps, generators etc.3 Better SFC ( less fuel consumption)4 Better maintenance and inspections due to modular structure.5 Less frontal area (lowers the RCS)6 Higher thrust.Hope the answer helpsu2026. Cheers !!!!if you like don't forget to upvote.