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Chandigarh: The outcome of India’s Atmanirbhar or indigenous military aviation ambitions is determined less by design maturity and technological competence, but largely by a persistent dynamic rarely articulated openly, yet operationally critical: delivery schedules of imported engines around which all these aerial platforms are structured.

Nowhere is this constraint more evident than in the twin delivery bottlenecks affecting two US-origin engines powering Hindustan Aeronautics Limited’s Tejas Mk1/Mk1A fighters and the Hindustan Turbo Trainer-40 (HTT-40) – platforms central to both frontline combat readiness and foundational (Stage I) pilot training. Persistent delays in the supply of General

Electric’s F404-IN20 afterburning turbofan for the Tejas and Honeywell’s TPE331-12B turboprop for the HTT-40 expose a critical vulnerability that India’s defence industrial base has yet to resolve.

For decades, this propulsion constraint has been structurally embedded in India’s defence aerospace ecosystem, where platform development and integration are largely domestic, but engine supplies remain externally controlled. This, in turn, has effectively translated into foreign influence over the Indian Air Force’s (IAF’s) operational timelines, shaping both platform induction rates and fleet availability.

Against this backdrop of overseas reliance, a clear divergence in public, media, and official attention has emerged in recent months between Hindustan Aeronautics Limited’s Tejas fighter and HTT-40 trainer programmes, particularly due to delayed engine deliveries from the two US suppliers.

In the case of Tejas Mk1A, deferred deliveries of F404 engines have attracted sustained scrutiny across mainstream and digital media, as well as in institutional discourse, due to their adverse downstream impact on the IAF’s combat squadron strength, which has fallen from a sanctioned 42 to around 29. These delays have also had serious knock-on consequences for HAL’s Nashik facility, where Mk1A fighters are being series-produced.

In response, HAL and GE have recently proposed a dedicated depot-level support arrangement with the IAF for the F404 ecosystem. However, despite official optimism, these measures remain under negotiation and have yet to translate into tangible operational relief.

By comparison, a clear asymmetry in attention persists between fighter and trainer programmes. Fighter aircraft, by........

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