 Another concept being considered is an enlarged version of the "Tejas" with two engines fitted with fully vectoring nozzles, which might make the vertical tail redundant (the "Tejas" has no horizontal tail).An indigenous Full-Authority Digital Engine Control (FADEC) unit, called "Kaveri Digital Engine Control Unit" (KADECU) has been developed by the Defence Avionics Research Establishment (DARE), Bangalore.The Combat Vehicles Research and Development Establishment (CVRDE) of Avadi was responsible for the design and development of the Tejas aircraft-mounted accessory gear box (AMAGB) and the power take-off (PTO) shaft.