从这几个新闻里，差不多可以推出，LCA的机体材料不过关，严重超重，应该是拖后的主要原因

Indian Air Force (IAF) has submitted a report to the Ministry of Defence (MoD) about how the  present engine in the indigenous Light Combat Aircraft (LCA) Tejas fighter aircraft, the American GE 404, does not meet the requirements of the IAF, and that the indigenous Kaveri engine has design problems, both of which are being seriously considered by the Government.

On December 14, Defence Minister A K Antony made a statement in Lok Sabha that the proposal put forth by Bangalore-based GTRE (Gas Turbine Research Establishment), of a joint venture between Kaveri and Snecma of France to bail out Kaveri, was under consideration by the Government, adding that the tender for 99 engines to be delivered by the winning company, both of whom have responded for commercial and technical proposals along with technology transfer. The competing concerns are the American GE F414 from General Electric Aviation and the German EJ200 from Eurojet.

The first 40 LCA aircraft will be powered by the American GE 404, while the ones after that would have either the American GE F414 from General Electric Aviation, or the German EJ200 from Eurojet, both of whom have responded to the tender floated by the Indian Government for a new engine for the aircraft, as the Kaveri-Snecma tie-up too was put down by Air Headquarters.