A ring gear arrangement, comprising: a ring gear mount comprising: a ring gear having at least one internal gear for interaction with one or more gear wheels, the ring gear having a principal axis about which the one or more gear wheels rotate; a ring gear stator; and, a plurality of couplings which locate the ring gear within the ring gear stator, each coupling having a resiliently deformable connection, characterised in that each coupling has a drive arm connected to the ring gear, the resiliently deformable connection is a torsion bar, the longitudinal axis of the torsion bar lies parallel to the principal axis, a first end of the drive arm connects to the ring gear and a second end of the drive arm connects to the torsion bar at a torqued end, and the opposing end of the torsion bar connects to a static structure, the drive arm includes a first drive member and a second drive member in series connection between the ring gear and the ring gear stator, the first end of the first drive member is pivotably connected to a radial flange of a mounting plate of the ring gear and extends to a pivot connection with the second drive member, the second drive member extends from the pivot connection towards a second end which is fixedly attached to the torsion bar, wherein the drive arm is movable between a first position in which the ring gear is in a rest position and a second position in which the ring gear has undergone some radial or rotational movement relative to the ring gear stator, wherein movement of the drive arm from the first position to the second position loads the resiliently deformable connection against the ring gear, wherein the resiliently deformable connection biases the drive arm to return to the first position when in the second position. a ring gear having at least one internal gear for interaction with one or more gear wheels, the ring gear having a principal axis about which the one or more gear wheels rotate; a ring gear stator; and, a plurality of couplings which locate the ring gear within the ring gear stator, each coupling having a resiliently deformable connection, characterised in that each coupling has a drive arm connected to the ring gear, the resiliently deformable connection is a torsion bar, the longitudinal axis of the torsion bar lies parallel to the principal axis, a first end of the drive arm connects to the ring gear and a second end of the drive arm connects to the torsion bar at a torqued end, and the opposing end of the torsion bar connects to a static structure, the drive arm includes a first drive member and a second drive member in series connection between the ring gear and the ring gear stator, the first end of the first drive member is pivotably connected to a radial flange of a mounting plate of the ring gear and extends to a pivot connection with the second drive member, the second drive member extends from the pivot connection towards a second end which is fixedly attached to the torsion bar, wherein the drive arm is movable between a first position in which the ring gear is in a rest position and a second position in which the ring gear has undergone some radial or rotational movement relative to the ring gear stator, wherein movement of the drive arm from the first position to the second position loads the resiliently deformable connection against the ring gear, wherein the resiliently deformable connection biases the drive arm to return to the first position when in the second position.