30 Questions
What method is preferred for ice control on propellers?
Electrical heating
How does the anti-icing fluid reach the propeller blades?
Via centrifugal force
What component controls the sequence of current to heater mats for propeller de-icing?
Timer unit
Which part of the propeller blades has embedded heater wires for ice control?
Leading edges
Why is the sequence of heating important in propeller de-icing?
To ensure effective ice removal
What purpose do electric elements serve on propellers?
De-icing by heat generation
What happens when ice forms on the diaphragm?
The contacts close, supplying current to an ice warning light.
How does the crew know that ice has formed on the probe?
By the activation of an ice warning light.
What causes the motor to twist slightly in its mount?
Ice forming on the rotor.
How does the micro-switch activate the warning light?
By sensing an increase in current draw.
What happens to the warning light when ice stops forming?
It turns off.
How is icing detected in the system?
By sensing increased current draw of the motor.
What will happen if the temperature reaches 55°C according to the text?
The windshield elements will stop receiving current flow.
What does the magnetic indicator show when the windshield system is operating under normal conditions?
NORM
How does leaving the windshield heat set on low affect the windshield's service life based on the information provided?
Increases the windshield's impact resistance
Why are pitot static probe heaters provided on aircraft approved for flight into known icing conditions?
To eliminate ice formations that could affect airspeed and altitude readings
What is the purpose of the overheat thermistor in the context of the windshield temperature controller?
To cut off current flow to the windshield elements at high temperatures
What forces must a jet aircraft's windshield withstand, according to the text?
Forces from air acting on it at speeds up to 1000 km/h
What is embedded in an inner layer of vinyl in some windshields?
Fine wire elements
How is the temperature of the windshield maintained at approximately 45 °C?
By passing 28-V DC current through the wire element
What controls the DC current to regulate the temperature of the windshield?
Thermistor
Why should windshield heat not be operated on the ground for extended periods?
To prevent damage to the windshield or heating element
What is the purpose of testing in accordance with the aircraft's maintenance manual?
To prevent possible damage to the aircraft's windshield or heating element
What type of power source is illustrated in the diagram for windshield temperature control?
Three-phase 200-V AC source
What happens to relay R7425 during flight operation?
It is deenergised
How are the head and strut of the probe powered in flight?
115-V AC power
What provides information to EICAS if power is not supplied through the heater?
Current sensor
How can the operation of the probe heater be checked on the ground?
Central Maintenance Computer (CMC)
What happens to relay R8268 in flight operation?
It is energised
How is each total air temperature probe anti-iced?
By an electric heater
Learn about how aircraft ice detection systems work, including the process of detecting ice formation, the role of the diaphragm, contacts, and probe heater. Understand the importance of de-icing actions in maintaining safe flight operations.
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