To continue from SP's initial post...The resting position for a 412 collective is around 1/2 travel, which is where it naturally goes to once hyd assistance is removed; I would assume this is the neutral position for the elastomeric bearings. If all hydraulic assistance is removed when at 100% NR, will the collective naturally revert to this position ? If this is the case it is extremely unlikely that any pilot would be able to stop it due to the forces involved.
The flight manual warns that flight with no hydraulic assistance is not possible (no surprises there!). Therefore why do we carry out a check that if succesful (ie the check proves there there is a malfunction) will potentially make the aircraft uncontrollable, possibly leaping into the air?
answers on a postcard....