Firstly, the AL-41F1 engine that was fitted on the FGFA was somewhat under powered to meet with the performance parameters of a fifth-generation platform as also was not reliable enough. The AL-41F1 was not a power plant developed specifically for this fifth-generation platform, but was a mere upgrade of the AL-31 that powers the Su-30 MKI that was a platform of the previous generation.
Me llama la atención que afirme que no es un motor fiable, porque lleva años operando sin dar muchos dolores de cabeza. Otra cosa es que no sea un modelo adecuado para un caza de 5°.
Capability of its radar was inadequate as it did not provide the desired coverage and the IAF would have preferred the new platform to be fitted with an AESA radar instead.
El PAK FA lleva un radar AESA desde el primer momento ¿Quizás la versión india montaba un PESA? Me cuesta creerlo, quizás sea un error, pero el que lo comenta es un Mariscal de la Fuerza Aérea, no un periodista.