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Aircraft Maintenance TroubleShoot > Aircraft Turbocharger & Controller Beechcraft 76-up Turbocharger System1. Variable absolute pressure system with poppet-type wastegate]2. High mounted turbos with scavenged oil system. 3. The variable absolute pressure controller (direct-sensing without cover) works much like the non-variable absolute pressure controller in that it senses deck pressure, compares it to a reference absolute pressure, and adjusts the wastegate butterfly (controlling turbo speed) to maintain sea-level horsepower at varying altitudes. It differs from the non- variable version, however, in that it is directly linked to the engine throttle, and, through a system of cams and followers, adjusts itself to varying power settings, achieving the optimum deck pressure for a given throttle movement. A pressure relief valve, set slightly in excess of maximum deck pressure, is provided to prevent damaging overboost in the event of a system malfunction. A sonic venturi is incorporated to provide a constant source of compressed air to the cabin pressurization system.
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