1. IAF launches investigation....
There are ONLY two possible outcomes from the investigation:
A. Mechanical failure , which means poor maintenance, using home made parts or made in China rather than using original replacement parts made in the good old USA or trying to strech the life span of such parts or
B. Human error which means the pilots were not properly trained.
When an aircraft crushes to the ground is not just the aircraft and the crew, is the all system that keeps them flying fail. Top brass should take responsibility, this is criminal negligence.