Aircraft Ice Detection System
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Questions and Answers

What method is preferred for ice control on propellers?

  • Centrifugal force
  • Insulating material
  • Electrical heating (correct)
  • Rubber boots
  • How does the anti-icing fluid reach the propeller blades?

  • Through rubber boots
  • By electrical current
  • Using insulating material
  • Via centrifugal force (correct)
  • What component controls the sequence of current to heater mats for propeller de-icing?

  • Rubber boots
  • Insulating material
  • Timer unit (correct)
  • Centrifugal force
  • Which part of the propeller blades has embedded heater wires for ice control?

    <p>Leading edges</p> Signup and view all the answers

    Why is the sequence of heating important in propeller de-icing?

    <p>To ensure effective ice removal</p> Signup and view all the answers

    What purpose do electric elements serve on propellers?

    <p>De-icing by heat generation</p> Signup and view all the answers

    What happens when ice forms on the diaphragm?

    <p>The contacts close, supplying current to an ice warning light.</p> Signup and view all the answers

    How does the crew know that ice has formed on the probe?

    <p>By the activation of an ice warning light.</p> Signup and view all the answers

    What causes the motor to twist slightly in its mount?

    <p>Ice forming on the rotor.</p> Signup and view all the answers

    How does the micro-switch activate the warning light?

    <p>By sensing an increase in current draw.</p> Signup and view all the answers

    What happens to the warning light when ice stops forming?

    <p>It turns off.</p> Signup and view all the answers

    How is icing detected in the system?

    <p>By sensing increased current draw of the motor.</p> Signup and view all the answers

    What will happen if the temperature reaches 55°C according to the text?

    <p>The windshield elements will stop receiving current flow.</p> Signup and view all the answers

    What does the magnetic indicator show when the windshield system is operating under normal conditions?

    <p>NORM</p> Signup and view all the answers

    How does leaving the windshield heat set on low affect the windshield's service life based on the information provided?

    <p>Increases the windshield's impact resistance</p> Signup and view all the answers

    Why are pitot static probe heaters provided on aircraft approved for flight into known icing conditions?

    <p>To eliminate ice formations that could affect airspeed and altitude readings</p> Signup and view all the answers

    What is the purpose of the overheat thermistor in the context of the windshield temperature controller?

    <p>To cut off current flow to the windshield elements at high temperatures</p> Signup and view all the answers

    What forces must a jet aircraft's windshield withstand, according to the text?

    <p>Forces from air acting on it at speeds up to 1000 km/h</p> Signup and view all the answers

    What is embedded in an inner layer of vinyl in some windshields?

    <p>Fine wire elements</p> Signup and view all the answers

    How is the temperature of the windshield maintained at approximately 45 °C?

    <p>By passing 28-V DC current through the wire element</p> Signup and view all the answers

    What controls the DC current to regulate the temperature of the windshield?

    <p>Thermistor</p> Signup and view all the answers

    Why should windshield heat not be operated on the ground for extended periods?

    <p>To prevent damage to the windshield or heating element</p> Signup and view all the answers

    What is the purpose of testing in accordance with the aircraft's maintenance manual?

    <p>To prevent possible damage to the aircraft's windshield or heating element</p> Signup and view all the answers

    What type of power source is illustrated in the diagram for windshield temperature control?

    <p>Three-phase 200-V AC source</p> Signup and view all the answers

    What happens to relay R7425 during flight operation?

    <p>It is deenergised</p> Signup and view all the answers

    How are the head and strut of the probe powered in flight?

    <p>115-V AC power</p> Signup and view all the answers

    What provides information to EICAS if power is not supplied through the heater?

    <p>Current sensor</p> Signup and view all the answers

    How can the operation of the probe heater be checked on the ground?

    <p>Central Maintenance Computer (CMC)</p> Signup and view all the answers

    What happens to relay R8268 in flight operation?

    <p>It is energised</p> Signup and view all the answers

    How is each total air temperature probe anti-iced?

    <p>By an electric heater</p> Signup and view all the answers

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