FNW, I think you mistook my question - in the 155 there is a switch on the overhead panel that turns off the cyclic trim 'mag-brake' to give you a 'floppy stick' (ooh er missus, to pre-empt any comment!). This is equivelant to holding in the FTR button, but without the force required. Turning off the auto Tri
will just mean you can't engage any upper modes that use the cyclic, and the SEMAs may saturate and require cyclic position to be re-datumned to centralise them. But that's the 155 a the 135 may not have such a switch. I'd be surprised if the autotrim cb would yield this outcome.