The early N001 set only had MTBF of 5 hours. Only then it managed to get fixed and reliability improved to 200 hr.

ok so it malfunctioned every 5 hours , but I’m assuming that is when radar is turned on /emitting till it malfunctions ?
it is not every 5 hr of flying time of su-27 right ? as a lot of time fighters fly with their radars not turned on /emitting