An aircraft nacelle assembly comprising: a substructure; a cowl door pivotally connected to the substructure; and a hydraulic piston actuator including: a housing concentrically disposed along an axis and pivotally connected to one of the substructure and the cowl door; a piston adapted to axially reciprocate within the housing and pivotally connected to the other of the substructure and the cowl door; an end gland fixed to the housing and disposed radially between the housing and the piston; a bearing ring fixed to the end gland and projecting radially inward from the end gland for sliding contact with the piston; and characterized by: a scraper seal supported by the housing and in sliding contact with the piston; wherein the scraper seal is disposed radially between the end gland and the piston; wherein the scraper seal is axially spaced outward from the bearing ring; wherein the end gland defines a circumferentially continuous channel communicating radially inward, and the bearing ring is substantially disposed in the channel; wherein the piston includes a cylindrical face facing radially outward; and wherein the end gland includes a first and second cylindrical surfaces spaced axially apart by the channel and opposing the cylindrical face; wherein the first cylindrical surface of the end gland is disposed adjacent to the scraper seal and the bearing ring; wherein the bearing ring is made of a material that includes thermoplastic, and the piston is metallic, and wherein the thermoplastic is re-inforced with carbon fibers that contain graphite. a substructure; a cowl door pivotally connected to the substructure; and a hydraulic piston actuator including: a housing concentrically disposed along an axis and pivotally connected to one of the substructure and the cowl door; a piston adapted to axially reciprocate within the housing and pivotally connected to the other of the substructure and the cowl door; an end gland fixed to the housing and disposed radially between the housing and the piston; a bearing ring fixed to the end gland and projecting radially inward from the end gland for sliding contact with the piston; and characterized by: a scraper seal supported by the housing and in sliding contact with the piston; wherein the scraper seal is disposed radially between the end gland and the piston; wherein the scraper seal is axially spaced outward from the bearing ring; wherein the end gland defines a circumferentially continuous channel communicating radially inward, and the bearing ring is substantially disposed in the channel; wherein the piston includes a cylindrical face facing radially outward; and wherein the end gland includes a first and second cylindrical surfaces spaced axially apart by the channel and opposing the cylindrical face; wherein the first cylindrical surface of the end gland is disposed adjacent to the scraper seal and the bearing ring; wherein the bearing ring is made of a material that includes thermoplastic, and the piston is metallic, and wherein the thermoplastic is re-inforced with carbon fibers that contain graphite. a housing concentrically disposed along an axis and pivotally connected to one of the substructure and the cowl door; a piston adapted to axially reciprocate within the housing and pivotally connected to the other of the substructure and the cowl door; an end gland fixed to the housing and disposed radially between the housing and the piston; a bearing ring fixed to the end gland and projecting radially inward from the end gland for sliding contact with the piston; and characterized by: a scraper seal supported by the housing and in sliding contact with the piston; wherein the scraper seal is disposed radially between the end gland and the piston; wherein the scraper seal is axially spaced outward from the bearing ring; wherein the end gland defines a circumferentially continuous channel communicating radially inward, and the bearing ring is substantially disposed in the channel; wherein the piston includes a cylindrical face facing radially outward; and wherein the end gland includes a first and second cylindrical surfaces spaced axially apart by the channel and opposing the cylindrical face; wherein the first cylindrical surface of the end gland is disposed adjacent to the scraper seal and the bearing ring; wherein the bearing ring is made of a material that includes thermoplastic, and the piston is metallic, and wherein the thermoplastic is re-inforced with carbon fibers that contain graphite. a scraper seal supported by the housing and in sliding contact with the piston; wherein the scraper seal is disposed radially between the end gland and the piston; wherein the scraper seal is axially spaced outward from the bearing ring; wherein the end gland defines a circumferentially continuous channel communicating radially inward, and the bearing ring is substantially disposed in the channel; wherein the piston includes a cylindrical face facing radially outward; and wherein the end gland includes a first and second cylindrical surfaces spaced axially apart by the channel and opposing the cylindrical face; wherein the first cylindrical surface of the end gland is disposed adjacent to the scraper seal and the bearing ring; wherein the bearing ring is made of a material that includes thermoplastic, and the piston is metallic, and wherein the thermoplastic is re-inforced with carbon fibers that contain graphite.