An assembly to allow reconfiguration of an aircraft fuselage door opening which is associated with a dedicated primary aircraft door (16a, 16b) comprising: a central support pole attachable to interior structure of an aircraft fuselage so as to be disposed in an upright position within an interior of the aircraft fuselage; and at least one stand-by alternate door (22a, 22b) which is sized and configured to be operatively accepted by the aircraft fuselage door opening when the dedicated primary aircraft door (16a, 16b) is in an opened condition, wherein the at least one stand-by alternate door (22a, 22b) is removably connected to the central support pole so as to be capable of being movably deployed into a position to close the aircraft fuselage door opening when disconnected from the central support pole; characterized in that the at least one stand-by alternate door (22a, 22b) comprises a door frame, and the assembly further comprises upper and lower mounting assemblies (40a, 40b, 42a, 42b) for removably mounting upper and lower portions of the door frame to the central support pole; wherein the upper mounting assembly (40a, 40b) comprises: at least one upper mounting arm associated with an upper portion of the door frame, and a mounting carriage slideably coupled to the central support pole for rectilinear movements between raised and lowered positions thereof, wherein the mounting carriage includes at least one upper mounting clip (48a, 48b) removably connected to the at least one upper mounting arm. a central support pole attachable to interior structure of an aircraft fuselage so as to be disposed in an upright position within an interior of the aircraft fuselage; and at least one stand-by alternate door (22a, 22b) which is sized and configured to be operatively accepted by the aircraft fuselage door opening when the dedicated primary aircraft door (16a, 16b) is in an opened condition, wherein the at least one stand-by alternate door (22a, 22b) is removably connected to the central support pole so as to be capable of being movably deployed into a position to close the aircraft fuselage door opening when disconnected from the central support pole; characterized in that the at least one stand-by alternate door (22a, 22b) comprises a door frame, and the assembly further comprises upper and lower mounting assemblies (40a, 40b, 42a, 42b) for removably mounting upper and lower portions of the door frame to the central support pole; wherein the upper mounting assembly (40a, 40b) comprises: at least one upper mounting arm associated with an upper portion of the door frame, and a mounting carriage slideably coupled to the central support pole for rectilinear movements between raised and lowered positions thereof, wherein the mounting carriage includes at least one upper mounting clip (48a, 48b) removably connected to the at least one upper mounting arm. at least one upper mounting arm associated with an upper portion of the door frame, and a mounting carriage slideably coupled to the central support pole for rectilinear movements between raised and lowered positions thereof, wherein the mounting carriage includes at least one upper mounting clip (48a, 48b) removably connected to the at least one upper mounting arm.