The Defence Bio-Engineering & Electro Medical Laboratory (DEBEL), a Bengaluru-based lab under the Defence Research and Development Organisation (DRDO), has successfully conducted high-altitude trials of the Indigenous On-Board Oxygen Generating System (OBOGS)-based Integrated Life Support System (ILSS) for the LCA Tejas aircraft. The trials were carried out on March 4, 2025.
The OBOGS-based ILSS is an advanced system designed to generate and regulate breathable oxygen for pilots during flight, eliminating the dependence on traditional liquid oxygen cylinder-based systems. This cutting-edge technology underwent rigorous testing on the LCA-Prototype Vehicle-3 aircraft of Hindustan Aeronautics Limited (HAL) and the Aeronautical Development Agency (ADA), meeting stringent aeromedical standards in various flight conditions, including altitudes up to 50,000 feet and high-G maneuvers.
The performance evaluations covered critical aspects such as oxygen concentration, demand breathing, availability of 100% oxygen, and aerobatic maneuvers at required altitudes. The system also underwent full functional testing of the Anti-G Valve, Breathing Oxygen System (BOS) during taxiing, takeoff, cruise, G turns, and rejoin approach and landing. Following flight clearance from the Centre for Military Airworthiness & Certification (CEMILAC), the system met all specified parameters.
The ILSS integrates 10 Line Replaceable Units, including the Low-Pressure Breathing Regulator, BOS, Emergency Oxygen System, Oxygen Sensor, Anti-G valve, and other advanced components, ensuring real-time oxygen generation and enhancing pilot endurance and operational effectiveness. Manufactured by L&T as a Development cum Production Partner, the ILSS boasts 90% indigenous content, furthering India’s self-reliance in aerospace technology. With appropriate modifications, the system can be adapted for use in MIG-29K and other aircraft.
This milestone has been achieved through the collaborative efforts of DEBEL, ADA, HAL, CEMILAC, the National Flight Test Center, the Directorate General of Aeronautical Quality Assurance, and the Indian Air Force (IAF). Rajnath Singh congratulated DRDO, IAF, Public Sector Undertakings, and industry partners on this remarkable achievement, emphasizing that this development aligns with the vision of ‘Viksit Bharat 2047.’
Samir Kamat also lauded the DRDO team, the IAF, and industry partners for their contributions to the successful high-altitude trial of the Indigenous ILSS for LCA Tejas. This accomplishment underscores India’s commitment to cutting-edge defense technologies and self-reliance in the aerospace sector.
