suitable cruising speed for close air support. Operating mainly out of SLAF Anuradhapura, at times Pucarás were detached to its forward base at SLAF Palaly, providing close air support for the Sri Lanka Army notably during Operation Riviresa. The Sri Lanka Air Force also deployed Pucarás for maritime patrolling. CA-605 was hit by ground fire over the Kilaly lagoon, but managed to land at SLAF Palaly; it is on display at the Sri Lanka Air Force Museum. During fierce fighting in the Northern Province during Operation Leap Forward, CA-601 was shot down by a MPADS in July 1995, killing its pilot Flight Lieutenant Dilhan Perera. CA-604 was destroyed while on a night bombing sortie from what appears to have been a premature ordnance detonation; its pilot ejected safely. Following the accident the sole remaining aircraft, CA-602, was retired in 1997 with Mil Mi-24 helicopter gunships taking over the role of close air support, followed by Mikoyan MiG-27s. The Pucará's lack of an oxygen system, limiting it to low altitudes, and lack of counter-measures against SAMs proved it be its main limitations. Upgrades In May 1982, at the peak of the Falklands War, the Argentine Air Force, in collaboration with the Navy, outfitted a prototype, AX-04, with pylons to mount Mark 13 torpedoes. The aim was its possible production as a torpedo bomber to enhance the anti-ship capabilities of the Argentine air forces. Several trials were performed off Puerto Madryn, over Golfo Nuevo, but the war ended before the technicians could evaluate the feasibility of the project. Several attempts were made to upgrade the entire fleet, including the Pucará Charlie conversion, Pucará 2000 and Pucará Bravo (modernization of 40 units was ordered and later cancelled by the FAA; only one unit was converted). These were cancelled during the 1980s due to shortage of funds. The Uruguayan Air Force updated its fleet with the incorporation of Litton LTN-211 and GPS omega navigation systems. Minor structure modifications were made in order to carry the Mk. 82 Snakeye bomb and 1000-litre drop tank. Other avionics incorporated were the WX-500 Stormscope by L3 Communications and LED Sandel SN3500 backlit display navigation. In 2007 an IA-58 of the Argentine Air Force was converted to carry a modified engine operating on soy-derived bio-jet fuel. The project, financed and directed by the Argentine Government (Secretaría de Ciencia Tecnología e Innovación Productiva de la Nación), made Argentina the second