IL-76 to Turn Testbed for India’s Homegrown Kaveri Engine

In a major leap toward India’s quest for aerospace self-reliance, the long-anticipated dream of indigenously testing jet engines may soon become reality.

The Gas Turbine Research Establishment (GTRE), under the Defence Research and Development Organisation (DRDO), has proposed converting one of the Indian Air Force’s (IAF) Ilyushin IL-76 aircraft into a Flying Test Bed (FTB) — specifically to test the homegrown Kaveri Derivative Engine (KDE) and future engines developed for India’s fifth-generation fighter program, AMCA.

The ambitious proposal is now reportedly close to getting the green light, marking a critical milestone in India’s engine development journey.

A Strategic Shift in India’s Jet Engine Testing Approach

According to sources close to idrw.org, the Ministry of Defence (MoD) has initiated discussions with the IAF to explore the feasibility of using one of its older IL-76 transport aircraft for the conversion. Once approved, the modified aircraft would serve as a dedicated in-flight engine testing platform — a capability India currently lacks.

Presently, India relies on Russia’s Gromov Flight Research Institute for in-flight engine trials, which typically involves long waiting periods of 9–10 months just to secure test slots. By establishing its own Flying Test Bed, India would drastically cut down on delays, reduce dependence on foreign facilities, and speed up the development of indigenous propulsion technologies.

Why the IL-76?

The IL-76, a heavy-duty, four-engine military transport aircraft, is considered ideal for conversion due to its robust airframe and proven adaptability. In such test-bed roles, one of the IL-76’s four engines is removed and replaced with the engine under evaluation. This enables real-time performance comparisons between the Kaveri derivative and the aircraft’s existing engines under actual flight conditions.

Equipped with sensors and monitoring systems, the IL-76 FTB would collect vital data on engine behavior, thrust consistency, fuel efficiency, altitude performance, and vibration analysis — all of which are crucial for further optimization and certification of the engine.

Reviving the Kaveri Program

The kaveri engine test in russia engine program, launched in the 1980s to power the Light Combat Aircraft (LCA) Tejas, faced multiple delays due to technical challenges and international sanctions. However, renewed momentum in recent years — supported by better funding, international collaborations, and technological advances — has led to the development of the Kaveri Derivative Engine (KDE).

This version, which produces around 48–50 kN of thrust in its dry (non-afterburning) configuration, is optimized for use in platforms such as the Ghatak Unmanned Combat Aerial Vehicle (UCAV). The GTRE is targeting in-flight testing of the KDE by 2025, with approximately 70 hours of test flights scheduled aboard an IL-76 aircraft.

Building the Road to AMCA

India’s Advanced Medium Combat Aircraft (AMCA), a 5th-generation stealth fighter in development, will require a much more powerful engine — estimated at 110 kN thrust class. The learnings from the Kaveri and its derivatives will directly contribute to the eventual development of this high-thrust engine, setting the stage for complete indigenous capability in powering future Indian fighters.

A Leap Toward Self-Reliance

By converting an IL-76 into a Flying Test Bed, India is positioning itself to take full control of its engine development lifecycle. The ability to conduct in-house, real-time in-flight testing will:

• Reduce foreign dependence
• Accelerate testing and validation timelines
• Lower long-term costs
• Enable rapid iteration and refinement of jet engines

This move not only supports India’s vision of Atmanirbhar Bharat (self-reliant India) in defense technologies but also demonstrates growing confidence in the country’s R&D ecosystem.

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