30 Questions
What is the purpose of an anti-ice system?
To prevent the formation of ice
How are de-icer boots typically constructed?
With multiple separate air passages or chambers
What is the function of the air control valve in de-icing systems?
To apply low pressure or vacuum to the tubes
How is vacuum pressure maintained in de-icing systems when not in use?
By applying low pressure or vacuum to the tubes
How long are the tubes typically inflated with high-pressure air in de-icing systems?
6 seconds
What is the role of engine-driven pumps in de-icing systems?
To supply high-pressure air to the tubes
What is the main danger of ice forming on the wings and stabiliser of an aircraft?
Increasing the aircraft weight and disturbing the smooth aerofoil shape, reducing lift
How does ice formation on a propeller affect its efficiency?
Lowering the efficiency of the propeller
What can ice formation on jet engine air intakes cause?
Loss of power or overheating
How can ice breaking off from a jet engine intake affect the aircraft?
Cause compressor blade damage
What is the consequence of ice formation on masts and probes such as pitot tubes and antennas?
Causing system failure and increasing drag
Why is ice forming on windshields dangerous for an aircraft?
Obscuring vision
What is the purpose of inflating de-ice boots on an aircraft?
To break the ice by protruding out
How long do the de-icer boots deflate for in the cold sequence after a 6-second inflation?
54 seconds
What is a crucial step in maintaining de-icer boots?
Washing with mild soap and water
How does the timer/distributor valve direct air to the de-ice boots?
By directing high-pressure air in a definite sequence
Which components of the aircraft are included in the warm sequence for de-ice boot inflation?
Multiple components including wings and stabilizers
How should oil and grease be removed from de-icer boots?
Use white spirit or lead-free gasoline lightly on a damp rag
What provides information to EICAS if power is not supplied through the heater?
Current sensor
How is the probe heater supplied with power during testing?
115-V AC power
What are the two modes in which most heater systems operate?
Air and ground
What is used for anti-icing in some cases?
Bleed air
During testing, which relays are energized for the probe heater?
R7421 and R8268
Which systems operate at 26-V AC on ground mode and 115-V AC in air mode?
Heater systems
What is the purpose of the engine anti-icing system mentioned in the text?
To prevent ice formation in the engine's inlet duct
What happens if ice builds up in the engine's inlet duct?
It disrupts airflow and reduces efficiency
Which aircraft components can be affected by ice entering the engine?
Compressor blades
What does a blue indicator light in the cockpit signify related to the engine anti-icing system?
Anti-icing system is on
Where is hot bleed air directed when the engine anti-icing system is activated?
Inlet guide vanes and nose dome
Why is blue used as an indicator color for the engine anti-icing system being active?
As an advisory display since it's not a regular operating system
Test your knowledge on the formation of pure rime ice, pure clear ice, and mixed ice in aircraft, as well as the unique occurrence of carburettor ice. This quiz covers information from the training materials for Turbine Aeroplane Aerodynamics, Structures, and Systems according to CASA Part 66.
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