A gas turbine engine, comprising: a rotor; a static structure; a foil bearing system operative to transmit rotor loads from the rotor to the static structure, wherein the foil bearing system includes: a foil bearing; and a self-aligning foil bearing mount operative to align the foil bearing with an axis of rotation of the rotor, wherein the self-aligning foil bearing mount has a static component and a movable component; and wherein the self-aligning foil bearing mount is operable to self-align with the axis of rotation of the rotor by sliding displacement of the movable component relative to the static component characterized in that the foil bearing system is configured to prevent a rotation of the movable component about the axis of rotation of the rotor; wherein the self-aligning foil bearing mount is a spherical bearing, the movable component of the bearing mount is a convex crown including a crown surface having a spherical shape and the static component is a concave receiver surface having a spherical shape, wherein the concave receiver surface receives the crown surface of the convex crown to permit the sliding displacement of the movable component relative to the static component wherein the convex crown is configured to rotate about an axis of rotation that is perpendicular to the axis of rotation of the rotor; and wherein the movable component is configured such that the rotation of the movable component is the rotation of the entirety of the movable component. a rotor; a static structure; a foil bearing system operative to transmit rotor loads from the rotor to the static structure, wherein the foil bearing system includes: a foil bearing; and a self-aligning foil bearing mount operative to align the foil bearing with an axis of rotation of the rotor, wherein the self-aligning foil bearing mount has a static component and a movable component; and wherein the self-aligning foil bearing mount is operable to self-align with the axis of rotation of the rotor by sliding displacement of the movable component relative to the static component a foil bearing; and a self-aligning foil bearing mount operative to align the foil bearing with an axis of rotation of the rotor, wherein the self-aligning foil bearing mount has a static component and a movable component; and wherein the self-aligning foil bearing mount is operable to self-align with the axis of rotation of the rotor by sliding displacement of the movable component relative to the static component characterized in that the foil bearing system is configured to prevent a rotation of the movable component about the axis of rotation of the rotor; wherein the self-aligning foil bearing mount is a spherical bearing, the movable component of the bearing mount is a convex crown including a crown surface having a spherical shape and the static component is a concave receiver surface having a spherical shape, wherein the concave receiver surface receives the crown surface of the convex crown to permit the sliding displacement of the movable component relative to the static component wherein the convex crown is configured to rotate about an axis of rotation that is perpendicular to the axis of rotation of the rotor; and wherein the movable component is configured such that the rotation of the movable component is the rotation of the entirety of the movable component.