Assumptions...
 

Rananim: -

If this is truly the case, would you like to start a new thread on this? This one would be great.

And returning to this thread, I don't think the safety of the aircraft would have been compromised by this action any more than by leaving the seat empty. We are also assuming it probably would not have been permitted by the company's own regulations. But having said that I'm going to look at my own company's rules... and guess what there is nothing to preclude anybody sitting in one of our crew seats. Unless they are remaining in the cockpit for the entire flight, when they have to sit in the Observer's seat. Now, I just wonder if Spice Jet's Ops. Manuals do actually preclude non-crew members from sitting in one of the pilot's seats?

PM

I agree with AV8r76, Singh has been one of the more mature and balanced TREs in the lot. Not condoning the act though, from the posts here, similar events have been common place around the world.

DGCA could well take a look within to clean up their own mess...

For those not familiar with crew training.
The examiner was sitting in the right seat, he was doing a check for the transition captain sitting on the left. The guy on the left seat was doing his command training.
The examiners son had a CPL and was not type rated on the 737.
The examiner probably got up from his seat (the right one) during cruise and let his son sit there... enjoy the view, keep his seat warm whatever.

All 3 pilots (2 type rated) were in the cockpit. Even though the non type rated chap didn't actually touch anything, there are obvious safety and legal ramifications.
Company and legal policies state only authorised people are allowed in the seat, the son could be an ex navy carrier pilot- it doesn't matter.