A hydraulic failure in a R44 is not as simple as keep flying etc, I can tell you from an unfortunate experience that they do not "simply" fail, they can kick in and out due to pump cavitation leaving an uncontrollable machine.
My problem was that I did not instantly know that it was a hydraullic failure, I experienced large vibrations in the cyclic and my immidiate thought was it was a problem with the main rotor head
So what no one tells you is what to expect from a partial failure of the hydraulics!
