Daijiworld Media Network -Chandigarh

Chandigarh, Mar 5: The Defence Research and Development Organisation (DRDO) has successfully completed high-altitude trials of its indigenously developed On-Board Oxygen Generating System (OBOGS)-based Integrated Life Support System (ILSS) for the Tejas fighter aircraft. This cutting-edge system ensures pilots have a continuous supply of breathable oxygen during flight, eliminating reliance on traditional liquid oxygen cylinders.

Developed by DRDO’s Defence Bio-Engineering and Electro Medical Laboratory (DEBEL), the ILSS features an advanced OBOGS that generates and regulates oxygen in real time. With an impressive 90% indigenous content, the system enhances pilot safety and endurance at extreme altitudes. Additionally, with suitable modifications, it can be adapted for use in aircraft like the MiG-29K.

The ILSS underwent extensive trials on the Prototype Vehicle-3 of the Tejas fighter, developed by Hindustan Aeronautics Limited (HAL) and the Aeronautical Development Agency (ADA). The system demonstrated full functionality under demanding conditions, including altitudes of up to 50,000 feet, high-G maneuvers, and extreme aeromedical stress tests. Key performance aspects evaluated included oxygen concentration and demand-based breathing, 100% oxygen availability in emergencies, and performance during aerobatic maneuvers, high-G turns, and landing phases. Following approval from the Centre for Military Airworthiness and Certification (CEMILAC), the system successfully met all specified aeromedical and operational parameters.

Beyond its oxygen-generating capabilities, the ILSS integrates 10 advanced replaceable units, including a low-pressure breathing regulator, emergency oxygen system, oxygen sensors, anti-G valve, and more—ensuring optimal pilot endurance and operational efficiency.

Manufactured by Larsen & Toubro (L&T) as a development-cum-production partner, the ILSS project is a collaborative effort involving ADA, HAL, the National Flight Test Center, Directorate General of Aeronautical Quality Assurance (DG-AQA), and the Indian Air Force (IAF).

Defence Minister Rajnath Singh and DRDO Chairman Dr. Samir V Kamat have applauded this significant achievement, recognizing the contributions of DRDO, IAF, public sector undertakings, and industry partners in strengthening India's self-reliance in defence technology.