Lesson 1 Ice Protection System PDF

AIRCRAFT AUXILIARY SYSTEM ICE PROTECTION SYSTEM Leo Luis O. Gatchalian Learning Objective 1. Know and Understand different types of ice 2. Understand the principles of ice protection systems 3. Understand how anti-icing systems function to prevent ice accumulation. 4. Describe the funct...

AIRCRAFT AUXILIARY SYSTEM ICE PROTECTION SYSTEM Leo Luis O. Gatchalian Learning Objective 1. Know and Understand different types of ice 2. Understand the principles of ice protection systems 3. Understand how anti-icing systems function to prevent ice accumulation. 4. Describe the functions of Sensors. Ice Formation, Classification and Effects Rain, snow, and ice, are longtime enemies of transportation. Flying has added a new dimension, particularly with respect to ice. Under certain atmospheric conditions, ice can build rapidly on airfoils and air inlets. Different Types of Ice Formation Clear Ice Formation occurs when droplets are large, such as in rain or in cumuliform clouds. Clear ice is hard, heavy, and tenacious. Its removal by de-icing equipment is especially difficult Rime Ice Rime ice is lighter in weight than clear ice, however its weight is of little significance. The irregular shape and rough surface of rime ice decrease the effectiveness and efficiency of the aerodynamic airfoils. Mixed Ice Ice particles become embedded in clear ice, building a very rough accumulation sometimes. Formation of ice on aircraft leading edge in a mushroom shape on leading edges. Icing Effects Ice or frost forming on aircraft creates hazards detrimental to safe flight. Icing Effects The ice and rain protection systems used on aircraft keep ice from forming or remove ice on the following airplane components: Wing leading edges Horizontal and vertical stabilizer leading edges Engine cowl leading edges Propellers Propeller spinner Air data probes Flight deck windows Water and waste system lines and drains Antenna Overview of Ice Protection System Ice Detection Ice can be detected visually, but most modern aircraft have one or more ice detector sensors that warn the flight crew of icing conditions. Generally, an annunciator light comes on to alert the flight crew when ice is detected. Ice Detection Two independent detectors and detector systems is normal. The typical anti-ice detector contains a probe which is vibrated at an established rate. Anti-Ice vs De-Ice Anti-icing equipment is turned on before entering icing conditions and is designed to prevent ice from forming. De-icing equipment is designed to remove ice after it begins to accumulate typically on the wings and stabilizer leading edges. Ice Control Method Anti-Icing System On large, high performance turbine powered aircraft, anti-ice is the preferred method of ice control. Methods of Anti Icing Thermal Pneumatic Thermal pneumatic systems used for the purpose of preventing the formation of ice on airfoil leading edges usually use heated air ducted span-wise along the inside of the leading edge of the airfoil and distributed around its inner surface. Thermal Electric Electricity is used to heat various components on an aircraft so that ice does not form. This type of anti-ice is typically limited to small components due to high amperage draw. Chemical Anti Icing Chemical anti-icing is used in some aircraft to anti-ice the leading edges of the wing, stabilizers, windshields, and propellers. The wing and stabilizer systems are often called weeping wing systems AIRCRAFT AUXILIARY SYSTEM Thank you Leo Luis O. Gatchalian