Dora - Perhaps missing the point here, the major significance is that at least two instructors (and they were from a school that had another Chipmunk "on strength") weren't teaching (or perhaps didn't even know) the correct technique for Chipmunk spin recovery.
I'd go a step further, I'm not sure they know the correct spin recovery full stop.
Extract from MOS Schedule 2:
2.1
Elements and performance criteria
FAE-8.1 – Recover from spin
perform pre-manoeuvre checks;
enter and establish an upright spin;
identify upright spin and direction of yaw;
close throttle;
stop yaw;
unstall wing by reducing AOA;
recover to controlled flight;
recover within the number of turns normally required for upright spin recovery in the aircraft type, within the aircraft and height limitations.
Moving the control column to somewhere near / forward of neutral won't achieve "unstall wing by reducing AOA".
Last edited by roundsounds; 12th Feb 2016 at 19:40.