My point about the rig takeoffs is the legal operation of the aircraft on instruments (because you have no visual references) below VminI (50 kts in the case of the 139) despite that being in contravention of the RFM - how is that circle squared or is it given a stiff ignoring?
On the Sea King we have a low velocity indicator giving along and across doppler velocities so even below 50 kts you have a reference to work from - presumably NS helos have something similar (inertial nav based) to get round the problem.
But is the use of such devices legislated for and allowed for public transport ops over land?