"The flight in question had GPS tracking for flight arrival information.
It went dead the same time as everything else. (EMP pulse?)"
Based on the reports I read yesterday, the pilot turned off the location transponder and took a right angle turn on a course that's roughly headed towards Bandar Aceh. (I think that's how it's spelled). The initial post's idea would work well if the plane only had mechanical difficulties and crashed. This does not seem to be the case; it was on the other side of the Malay Peninsula from where it was supposed to be when the military radar lost it; that wasn't something it did because of mechanical difficulties or engine failure.