How can primary radar returns indicate an aircraft’s instantaneous heading?
It is said MS804 turned 90 degrees left and then 360 degrees right, giving the impression they were balanced turns. The primary plot may well have described such a path, but who knows where the nose was pointing?
Couldn’t it have been ‘tumbling’, inverted, slipping backwards/sideways, etc.? Very unlikely, I admit, but possible?
The greater the turn radius the greater the probability the turn was balanced/controlled, but do we know the approximate radius?