In Technical round expected o know Analog / Digital Electronics principles, Avionics, DO254, Testing, Simulations. Once Technical got cleared you almost cleared the interview process. Manager round evaluate your commitment and willingness to work.
I applied online. The process took 4 weeks. I interviewed at Collins Aerospace (Bengaluru) in Jan 2018
Interview
Written test, F2F technical discussion, Manager round followed by HR discussion. The interview questions are majorly on technical topics and your work. They look into how good are in learning , unlearning and relearning the things.