An aircraft engine having an oil circuit and a transmission that can be supplied with oil via the oil circuit. Oil fed to the transmission can be directed out of the transmission into an oil reservoir, from which oil can be introduced directly back into the transmission via a hydraulic line path. According to the invention, the oil fed to the oil reservoir can only be fed to the hydraulic line path below a defined filling level of the oil reservoir. When the defined filling level of the oil reservoir is reached, oil can also be introduced into a further hydraulic line path.

A method of supplying a bearing compartment with fluid includes the steps of pumping a fluid from a main reservoir to a bearing compartment through a main supply passage which includes one or more passage segments. During a positive gravity condition, the pumping step is performed using a main pump arranged in the main supply passage. The main reservoir includes upper and lower portions. The main supply passage is in fluid communication with the lower portion. Fluid is provided from the main reservoir to the bearing compartment through a secondary supply passage that is fluidly connected to at least one segment of the main supply passage in response to a negative gravity condition. The secondary supply passage is in fluid communication with the upper portion.

According to the present disclosure, a gas turbine assembly includes a gas turbine engine and a gearbox. The gearbox includes a lubrication system including a first sump and a second sump. The lubrication system is configurable to use either of the first and second sumps to correspond to various configurations of the gas turbine assembly.

A disclosed lubrication system for turbofan engine includes a primary lubricant circuit, a primary pump driving lubricant through the primary circuit, an auxiliary lubricant circuit in communication with the primary lubricant circuit and an auxiliary lubricant pump driving lubricant through the auxiliary lubricant circuit. A first valve downstream of an outlet of auxiliary lubricant pump separates the auxiliary lubricant circuit from the primary lubricant circuit. A sensor is disposed within the auxiliary lubricant circuit for sensing pressure within the auxiliary lubricant circuit separate from a pressure within the primary lubricant circuit.

A crankcase ventilation system, preferably for an engine capable of operation in roll-over situations and/or in steeply oblique positions, and/or for permitting such operation. The crankcase ventilation system includes a crankcase, preferably at least one extraction point for blow-by, and at least one blow-by separator a blow-by separation container. The at least one blow-by separator and the blow-by separation container are connected to one another.

Aspects of the disclosure are directed to a system comprising: a tank that stores a fluid, and a conduit that includes a first end and a second end, where the conduit is configured to convey at least a portion of the fluid stored in the tank from the second end of the conduit to the first end of the conduit, where a first end region of the conduit coinciding with the second end of the conduit has a first end region density and the fluid has a fluid density, where the first end region density is greater than or equal to the fluid density such that the first end region of the conduit remains immersed in the fluid stored in the tank when the fluid in the tank is under negative gravity conditions.

An apparatus and methods for the lubrication of the engine of an off-road vehicle, such as when the vehicle is airborne or upside down due to tipping over. The apparatus includes an upper chamber and a lower chamber. Fluid communication is established between the upper chamber and the lower chamber by way of a central tube. One or more vanes are arranged in the interior of the central tube to inhibit oil flow from the lower chamber to the upper chamber when the vehicle is upside down. An inlet hose connector is configured for receiving engine oil from an oil cooler and supplying the engine oil to the lower chamber. An outlet hose connector is configured for conducting the engine oil from the lower chamber to the engine. A bypass hose connector is configured for allowing the engine oil to exit from the upper chamber to the engine.

A lubrication system of a gas turbine engine includes a lubricant reservoir with a housing having a volume of oil located therein. A reservoir passage extends through the housing. One or more side passages extend from the reservoir passage and are configured to selectably fill or drain the volume of oil. An output passage is separate and distinct from the reservoir passage, and a separator wall extends into the interior of the housing from the first housing wall toward the second housing wall and between the reservoir passage and the output passage. When the lubricant reservoir is in a first orientation, the lubricant reservoir is filled via oil flowed through the reservoir passage from the first housing end, and when operated in a negative G orientation, the lubricant reservoir is drained via oil flowed through the reservoir passage and out of the second housing end.

An internal combustion engine having: a plurality of cylinders, where respective pistons slide on the inside; a crank chamber arranged higher than the cylinders; a crankshaft, which is arranged in the crank chamber higher than the cylinders and is connected to the pistons; a lubricating system provided with an oil tank, with a lubricating pump, which draws from the oil tank, and with a series of lubricating devices, which receive oil from the lubricating pump and supply oil to moving components; and a control unit configured, when a command to turn off the internal combustion engine is received, to interrupt the supply of oil to the lubricating devices in advance with respect to the actual stopping of the rotation of the crankshaft.