A helicopter has an air inlet barrier filter (IBF) system including a guide rail extending axially along one side of a nacelle housing a helicopter engine. A filter panel is slidable along the guide rail for movement between a filtered position in which the filter panel covers an air inlet of the nacelle and an unfiltered position in which the filter panel uncovers a total surface area of the air inlet to provide for a fully unobstructed air flow to the engine.

An air supply system has an air intake that provides air to an air vehicle engine. An inlet port supplies air to the air intake. First apertures on the surface of the air intake provide an uninterrupted air supply when the inlet port is blocked. A rotary cylinder is mounted to be rotatable around the air intake. The first apertures and second apertures that are on the surface of the rotary cylinder form an open position so air is introduced into the air intake and a closed position in which air supply to the air intake is blocked. An actuator triggers a first gear on the rotary cylinder to rotate around the air intake of the rotary cylinder. A second gear provides motion transmission between the actuator and the first gear. A sensor unit measures temperature, pressure, humidity and/or flow values of air passing through the air intake.

An air intake unit for an engine of a vehicle includes a housing, a bypass air intake, a shutter element, and actuator. A plenum is defined inside the housing which can be connected to the engine. Air coming from the outside needed for the operation of the engine can be sucked into the plenum through the bypass air intake. The shutter element is coupled to the bypass air intake and is mounted to move between a closed position, in which the shutter element closes the bypass air intake, and an open position, in which the shutter element leaves the passage through the bypass air intake free. The actuator is configured to move the shutter element between the closed position and the open position. The actuator has a spring configured to generate, by expanding, an opening movement moving the shutter element from the closed position to the open position.

A method of producing an operational data for an aircraft turbine engine is provided that including: sensing an inlet airflow to an aircraft turbine engine for CMAS particulate matter, the sensing performed during one or more ground portions of a flight operational cycle of the turbine engine, the sensing producing sensor signals indicative of the presence or absence of the CMAS particulate matter; determining a presence or absence of an exposure by the turbine engine to a CMAS environment based on the sensor signals; and producing an operational data indicative of the presence or absence of said exposure by the turbine engine to said CMAS environment.

An air-debris separator includes a center body, an inner wall, an outer wall, a separation passage, a first outlet passage and a second outlet passage. The center body extends longitudinally along a longitudinal centerline. The inner wall and the outer wall extend longitudinally along and circumferentially about the center body. The separation passage extends longitudinally within the air-debris separator to the first outlet passage and the second outlet passage. The separation passage is radially between the center body and the outer wall. The separation passage includes a convergent section and a radial outer diameter that decreases as the convergent section extends longitudinally towards the first outlet passage and the second outlet passage. The first outlet passage is radially between the center body and the inner wall. The second outlet passage is formed by and radially between the inner wall and the outer wall.

A method of directing particles entrained within an airflow disposed to enter a gas turbine engine of an aircraft is provided. The gas turbine engine includes a nose cone, a fan section, a compressor inlet, a compressor section, and a turbine section. The nose cone is fixed for rotation with the fan section. The method includes: providing an entrained particle removal (EPR) system configured to inject a fluid outward from the nose cone from a plurality of nozzles engaged with the nose cone, wherein the nozzles are spaced apart from one another around a circumference of the nose cone; and controlling the EPR system to inject the fluid from the plurality of nozzles into the airflow. The particles wetted by the injected fluid are subject to centrifugal force in and aft of the fan section and are directed radially outward of the compressor inlet.