At the very start of the Jaguar contract and subsequent planning for implementation, the Indian Air Force had specified major upgradation of the aircraft, its engines, the avionics and weapon systems. The Rolls Royce licence agreement signed in 1979 was for the uprated Adour Mk.811 (4205kg thrust with reheat), to give the Jaguar more power in the prevailing high ambient conditions. As for the avionics and nav-attack systems, while majority of HAL-built Jaguars have the standard Ferranti Laser Ranger and Marked Target Seeker (LRMTS) fitted in the nose, eight aircraft are fitted with the Thomson-CSF Agave multi-mode I/J band radar for maritime role.
The IAF Jaguars were to be integrated with a new nav-attack system, and the IAF selected the then new-generation Sagem ULISS-82 inertial navigation system. Also selected were the Ferranti COMED 2045 (Combined Map and Electronic Display), already in production for the U.S Navy’s F/A-18, Smiths Type 1301 HUD displaying raster and stroke symbology, and Smiths multipurpose processor interfaced with a MIL STD 1553 dual redundant digital databus charged with weapon aiming and air data computation. Responsibility for installation, development and interface was given to the INAS Integration Organisation (popularly known as the I.I.0), established at Bangalore to coordinate the programme with HAL’s Design & Development Bureau and the ASTE.
The integration and firing trials of Matra R.550 Magic Air-To-Air missiles on the Jaguar’s over-wing pylons was also successfully carried out and completed by the ASTE in the closing months of 1982. The high technical and operational expertise displayed by the Indian organisations received laudatory praise from numerous European aerospace firms involved. The Indian Jaguar was with the new equipment and systems, known as the DARIN version.
Over the past decades, HAL-built Jaguars have been equipped with the indigenously-developed DARIN (Display Attack and Ranging Intertial Navigation) system which incorporated second generation gyros and computers in conjunction with sensor, electronic and nav-attack processors. In this configuration, the Jaguar-DARIN served with confidence for over two decades while the relentless march of new technologies and systems inspired HAL’s ARDC to work on the DARIN II system, augmenting even further the Jaguar’s operational capabilities, followed by the DARIN III, and thus the Jaguar’s will remain in frontline service till the 2030’s for the Indian Air Force.