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The Indian Air Force (IAF) has embarked on a vital domestic manufacturing initiative to secure the future of its Jaguar strike fighter squadrons.
The project focuses on locally producing crucial backup batteries for the aircraft's cockpit electronics, effectively ending reliance on foreign suppliers.
This push, spearheaded by the 5 Base Repair Depot (5 BRD) situated in Sulur, aims to build specialised Electronic Flight Instrument System (EFIS) batteries exclusively for the upgraded Jaguar DARIN III jets.
This transition occurs at a critical juncture for the IAF. By May 2026, the original European manufacturers responsible for the legacy avionics of the aircraft have effectively withdrawn their long-term technical support.
As India is currently the sole remaining operator of the SEPECAT Jaguar in the world, this withdrawal has created pressing maintenance hurdles for the nation's primary deep-penetration strike aircraft.
The focal point of this new tender is a unique component bearing the part number JAG/803551 (DP4947).
This is not a standard aviation power source; the EFIS battery serves as a dedicated emergency reserve meant specifically for the digital screens within the modernised cockpit.
Should the aircraft suffer a complete electrical failure or a dual shutdown of its Rolls-Royce Adour engines, this battery keeps vital displays—such as the Primary Flight Display (PFD), altitude and attitude indicators, and navigation screens—running just long enough for the pilot to attempt an engine restart or execute a safe ejection.
Such a failsafe is indispensable in real-world combat. The Jaguar is designed as a low-level, twin-engine attack aircraft meant to penetrate deep into hostile airspace. During these high-speed, terrain-hugging flights, even a momentary loss of essential flight data could prove fatal.
The DARIN III (Display Attack Ranging Inertial Navigation) upgrade, implemented by Hindustan Aeronautics Limited (HAL), was a massive leap for the Jaguar platform.
It transformed the Cold War-era attack jet into a digitally networked precision bomber, complete with a "glass cockpit," advanced targeting systems, and smart weapon integration.
However, sustaining this modernised ecosystem now requires a self-reliant defence supply chain for parts abandoned by overseas vendors.
Meeting the stringent environmental and physical demands of combat operations stands as the primary technical hurdle for this project.
The newly developed EFIS batteries must adhere to rigid military specifications, surviving massive G-forces, intense vibrations, and dramatic temperature swings ranging from the freezing altitudes of Ladakh to the scorching heat of the Rajasthan desert.
Unlike standard batteries found in commercial airliners, these military-grade power units must function flawlessly during violent aerial combat manoeuvres.
They are expected to endure rapid changes in altitude, severe electromagnetic interference, and long periods in storage while retaining absolute reliability.
The formal Expression of Interest (EOI) for this project was released to the public on April 27, 2026.
After a brief window for technical clarifications, bidding officially closed in mid-May. The tender outlines a 180-day validity window, with the first 90 days entirely dedicated to the rapid development and testing of a working prototype.
During the initial development phase, participating vendors are tasked with engineering the internal chemical makeup of the batteries. They must design a power management system that safely meets the strict certification standards required for military aviation.
The subsequent phase shifts focus to physical manufacturing and rigorous certification. At the 5 Base Repair Depot, these prototype units will be subjected to intense vibration analysis, electrical endurance checks, and thermal stress tests before being cleared for actual test flights.
Once a prototype passes all military qualifications, the winning manufacturer will be designated as the main production source. They will be tasked with fulfilling the Initial Order Quantity to equip the IAF's remaining active fleet of approximately 120 Jaguars.
A standout feature of this indigenisation effort is the introduction of modern smart technology into the battery packs. The IAF is mandating the integration of Digital Health Monitoring capabilities.
The newly developed batteries will incorporate embedded microchips designed to track internal conditions in real-time. These sensors will monitor the unit's charge cycles, overall heat generation, battery degradation, and immediate flight readiness.
This digital upgrade will allow ground maintenance crews to scan the battery's health using handheld devices, bypassing the need to physically extract the unit from the cockpit for inspection.
This innovation will drastically cut down routine aircraft maintenance times and allow logisticians to predict when a replacement is needed before a failure occurs.
For active fighter squadrons on the frontlines, this rapid diagnostic capability will substantially boost operational efficiency. By accelerating pre-flight checks, the IAF can launch back-to-back sorties at a much faster rate during intense combat scenarios.
