Strategic Autonomy in the Skies: Reviving India’s Kaveri Engine Program

The Indian Air Force (IAF) faces a serious squadron shortage, with 42 squadrons planned but only around 29 currently operational. Modernization efforts, like the Tejas Mk-1A induction, aim to close this gap but they are held back by reliance on foreign engines, mainly the U.S.-made GE F414. Ongoing supply delays threaten timely aircraft deliveries, weakening India’s deterrence in a tense two-front scenario with China and Pakistan. Bringing back the indigenous Kaveri engine program, led by the Defence Research and Development Organisation (DRDO), is a crucial strategic move. It would boost engine self-reliance, speed up squadron expansion and protect national security from external supply risks.

Approved in 1986, the Kaveri engine program was undertaken by the Defence Research and Development Organisation through the Gas Turbine Research Establishment to develop an indigenous turbofan for the HAL Tejas. The initiative emerged from India’s long-standing dependence on imported propulsion systems powering much of the Indian Air Force fleet, including legacy platforms such as the MiG-21. Technically, Kaveri was designed as a low-bypass, afterburning twin-spool turbofan targeting roughly 52 kN dry thrust and about 81 kN with afterburner. While the engine ultimately failed to achieve the thrust-to-weight ratios required for Tejas integration, the program helped establish India’s foundational capabilities in aero-engine design, high-temperature metallurgy and propulsion testing infrastructure.

Despite its strategic promise, the Kaveri program struggled to achieve operational benchmarks due to a convergence of technical, infrastructural and managerial limitations, On the technical side, the engine delivered only 49–51 kN dry thrust against the 81 kN target, with turbine overheating, unstable combustion at high altitudes and weaknesses in high-temperature nickel-based superalloys affecting blade durability under extreme heat above 1,500°C.

Program management problems made things worse: oversight was split between DRDO’s GTRE, HAL and IAF teams, causing misalignments. Changes in design often clashed with Tejas airframe schedules, delaying integration. Funding was inconsistent. Limited test facilities, including high-altitude and flight trial setups, further slowed progress from 1996 bench tests to prototypes in the 2010s.

The Tejas Mk-1A program is facing significant delays due to postponed deliveries of GE F414-IN20 engines. Initial deliveries, expected by mid-2025 to enable phased inductions through 2030, have now been deferred to mid-2026, leaving 24 airframes idle at HAL’s Nashik assembly lines. Only 20 engines are slated for FY2026–27 while the rest of the 99-engine order remains pending, reflecting ongoing supply chain bottlenecks and delayed sub-vendor deliveries. These delays stem from a combination of sub-vendor production limitations, global disruptions in semiconductors and raw materials and challenges in export licensing and logistics from the U.S. The operational impact is severe: the IAF’s squadron strength remains at 29 operational versus 42 sanctioned, postponing frontline readiness by approximately 18 months.

Reviving the Kaveri engine program is imperative for establishing India’s strategic autonomy in aerospace propulsion and addressing critical operational gaps in the IAF. Bench and afterburner trials conducted in 2026, in collaboration with international partners for materials and high-temperature turbine coatings, demonstrate that Kaveri derivatives can achieve stable thrust levels near the 80–85 kN class, sufficient for Tejas Mk-1A, UAVs like Ghatak, and future twin-engine platforms such as the Advanced Medium Combat Aircraft (AMCA). Recent testing of Kaveri derivative engines at high-altitude facilities demonstrates ongoing efforts to refine indigenous propulsion technology. Indigenous engine production would enable HAL to maintain uninterrupted assembly lines, closing the current squadron shortfall while mitigating vulnerabilities arising from repeated delays in GE F414 engine deliveries. Economically, reviving Kaveri catalyzes a domestic high-tech ecosystem, spurring advanced materials research, precision manufacturing and AI-assisted design simulations, while generating a number of significant jobs and reducing lifecycle costs linked to foreign procurement. A coordinated revival strategy combining ring-fenced public funding, modular engine upgrades and targeted public-private partnerships, offers a pathway to sustained operational readiness, industrial competitiveness and technological sovereignty, positioning India as a credible actor in global aerospace development.

The trajectory of the Kaveri program reflects the structural difficulty of mastering aero-engine technology, one of the most tightly controlled domains in global defence manufacturing. Yet the operational consequences of continued dependence are increasingly visible. Delays in the supply of GE F414 engines for the HAL Tejas have slowed production timelines and reinforced how external supply chains can shape the modernization pace of the Indian Air Force. For a force already operating below its sanctioned squadron strength, such bottlenecks carry strategic implications. Reviving the Kaveri initiative, potentially through incremental development, international technical partnerships and integration with next-generation platforms, would not merely address a legacy program but advance India’s broader objective of technological autonomy in aerospace propulsion, a capability essential for sustaining long-term airpower modernization.