New Delhi: The Defence Bio-Engineering & Electro Medical Laboratory (DEBEL), a Bengaluru-based lab under the Defence Research and Development Organisation (DRDO), 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 on 4 March 2025.
 

The OBOGS-based ILSS is designed to generate and regulate breathable oxygen for pilots during flight, eliminating reliance on traditional liquid oxygen cylinder-based systems. The system was tested on the LCA-Prototype Vehicle-3 aircraft of Hindustan Aeronautics Limited (HAL) and the Aeronautical Development Agency (ADA), meeting aeromedical standards in varied flight conditions, including altitudes of up to 50,000 feet above mean sea level and high-G manoeuvres.
 

Performance evaluations included oxygen concentration, demand breathing, availability of 100% oxygen, and aerobatic manoeuvres at required altitudes. The system was tested for full functional performance of the anti-G valve and breathing oxygen system (BOS) during taxiing, take-off, cruise, G-turns, and landing. Following flight clearance from the Centre for Military Airworthiness & Certification (CEMILAC), it successfully met all specified parameters.
 

Beyond OBOGS, the ILSS integrates 10 line-replaceable units, including the low-pressure breathing regulator, BOS, emergency oxygen system, oxygen sensor, and anti-G valve. This ensures real-time oxygen generation, enhancing pilot endurance and operational effectiveness. The system has been manufactured by L&T as a development-cum-production partner, marking a significant collaboration between DRDO and Indian defence industries. With 90% indigenous content, it strengthens India's self-reliance in aerospace technology. With suitable modifications, the system can also be adapted for use in MiG-29K and other aircraft.
 

This milestone is the result of joint efforts by DEBEL, ADA, HAL, CEMILAC, the National Flight Test Center, the Directorate General of Aeronautical Quality Assurance, and the Indian Air Force (IAF).
 

Defence Minister Rajnath Singh congratulated DRDO, the IAF, public sector undertakings, and industry partners on this achievement, stating that it reinforces India’s commitment to advanced defence technologies and aligns with the vision of ‘Viksit Bharat 2047.’
 

Secretary, Department of Defence R&D and Chairman DRDO Samir V Kamat also commended the DRDO team, the IAF, and industry partners for their contributions to the successful high-altitude trial of the indigenous ILSS for LCA Tejas.
 

BI Bureau