Abstract: A centrifugal air-oil separator system for a gas turbine engine system is described. The air-oil separator system has a rotatable shaft and the shaft includes an axially extending bore formed at least partially through the shaft. A gear is integral to or mounted on an outer surface of the shaft. The air-oil separator system also includes a bolt-on breather mounted on the shaft and independent from and in contiguous contact with the gear to assist in separating the oil from the air. Various types of materials may be utilized in the construction of the air-oil separator system.

Abstract: Scavenge systems for a gas turbine engine including a valve positioned at a first drainage outlet of an enclosure to selectively open and evacuate liquid from the cavity through the first drainage outlet in response to the valve being submerged in liquid are provided. Methods of reducing suction of air from an enclosure of a cavity of a gas turbine engine are further provided.

Abstract: A forced air supply system is provided to deliver forced air to fluid or a mixture of fluid and air in an enclosure of a cavity of a gas turbine engine when the gas turbine engine experiences a negative-gravity force event. Methods are also provided for removing fluid and/or air from the enclosure when the gas turbine engine experiences the negative-gravity force.

Abstract: A method includes manufacturing a sheet-type substrate having a security thread in which a security thread having features spaced apart from one another in the longitudinal direction of the security thread is inserted into the substrate in such a way that it is at least partially embedded in the substrate. At least one of the features is displayed as an image after the embedding of the security thread. The stretch of the embedded security thread in the longitudinal direction is calculated based on the image of the at least one feature, and the region of the substrate in which the calculated stretch of the security thread exceeds a specified maximum stretch is obliterated depending on the calculated stretch.

Abstract: The present invention relates to a method for manufacturing a sheet-type substrate having a security thread, especially a banknote paper having a security thread, in which a) a security thread having features spaced apart from one another in the longitudinal direction of the security thread is inserted into the substrate in such a way that it is at least partially embedded in the substrate, b) at least one of the features is displayed as an image after the embedding of the security thread, c) the stretch of the embedded security thread in the longitudinal direction is calculated based on the image of the at least one feature, and d) the region of the substrate in which the calculated stretch of the security thread exceeds a specified maximum stretch is obliterated depending on the calculated stretch.