Airframes and systems - part 7

Để giúp học sinh chuẩn bị cho các kỳ thi ATPL, khóa học này bao gồm hơn 450 EASA ATPL theo phong cách câu hỏi và câu trả lời. Khi không khí làm tăng nhu cầu giao thông trong những năm tới, ngành hàng không phải phục vụ cho các hệ thống mới nhu cầu cần thiết để hỗ trợ tăng trưởng. Chúng tôi có thể cung cấp các tiêu chuẩn công nghệ mới nhất về khả năng của hệ thống điện tử và hiệu suất máy bay | AIRCRAFT SYSTEMS ICE AND RAIN PROTECTION In a compressor bleed system the hot air is tapped directly from a compressor stage and after mixing with a supply of cool air in a mixing chamber it passes into the main ducting. In some systems equipment . safety shut-off valves is provided to ensure that an air mass flow sufficient for all de-icing requirements is supplied within pressure limits acceptable to duct and structural limitations. The heat exchanger method of supplying warm air is employed in some types of aircraft powered by turbo-propeller engines. The heat exchanger unit is positioned so that exhaust gases can be diverted to pass between tubes through which outside air enters the main supply ducts. The supply of exhaust gases is usually regulated by a device such as a thermostatically controlled flap fitted in the ducting between the exhaust unit and the heat exchanger. In a combustion heating system ram air is passed through a cylindrical jacket enclosing a sealed chamber in which a fuel air mixture is burned and is heated by contact with the chamber walls. Air for combustion is derived from a separate air intake and is supplied to the chamber by means of a blower. Temperature Control. The control of the air temperature within ducting and leading edge sections is an important aspect of thermal de-icing system operation and the methods adopted depend on the type of system. In a typical compressor bleed system control is effected by temperature sensing units which are located at various points in the leading edge ducting and by valves in the main air supply ducting. The sensing units and valves are electrically interconnected so that the valves are automatically positioned to regulate the flow of heated air to the system thus maintaining the temperature within a predetermined range. Indications of air temperature conditions are provided by resistance type temperature sensing elements and indicators temperature sensitive switches and overheat warning .

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