K48,
Hydraulic lock and Jack Stall are not related. Other than by the fact that they both involve actuators.
Like Nick has already said, please stop trying to start another 'helicopter myth'. If you want to find out about some other 'helicopter myths', try searching through the threads that Nick has started. It is a very, very interesting thread.
re the Dauphin incident - it has been mentioned (and analysed) already in the other Jack Stall threads.
And finally:
re The Hyd check at 60% N1 on the 206 during start up.. is this check for 'stick jump' for servo weakness (and perhaps potential Hyd Lock) as you describe.. ?
Essentially, no. Why not? Because you can't selectively turn off the individual servos in a B206. You are just checking the general state of the hydraulic system - ie is it working or not? In his example, Nick is probably referring to much larger helicopters (ie S76, S92 etc)