Aircraft De-Icing Systems Quiz

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Questions and Answers

What is one of the components that may be found in a fluid system for aircraft de-icing?

Control surface

Navigation system

Weather radar

Pump (correct)

Which of the following is NOT a suggested precaution before conducting an operational check of the windscreen wiper system?

Check the fluid level in the pump reservoir (correct)

Ensure the windscreen is free of foreign matter

Ensure the windscreen is wet with water

Ensure the blades are secure and undamaged

What action should be avoided when operating the windscreen wipers?

Operating them at high speed

Operating them continuously for long durations

Using them on a wet windscreen

Using them on a dry windscreen (correct)

What should be inspected regarding the windscreen wiper blades?

Their security, damage, and contamination Signup and view all the answers

Which of the following is an example of a maintenance task as per the maintenance manual?

Examining hydraulic pipes for leakage Signup and view all the answers

What is the primary purpose of having separate windshield wiper systems for the pilot and copilot?

To ensure visibility is maintained if one system fails Signup and view all the answers

What type of motors do almost all windshield wiper systems utilize?

Electrical motors Signup and view all the answers

What aspect of maintenance involves checking for proper operation after a system component is replaced?

Operational check Signup and view all the answers

Which adjustment is NOT typically performed on a windshield wiper system?

Length of wiper arm Signup and view all the answers

How does a chemical rain repellant affect water on treated glass?

It allows water to form beads that do not spread evenly Signup and view all the answers

What is the primary function of the high-velocity slipstream in relation to a rain repellant system?

To continually remove water beads from the windshield Signup and view all the answers

In what way does a switch or push button function in a rain repellant system?

To distribute the chemical repellant Signup and view all the answers

What is the effect of pouring water on untreated glass compared to treated glass?

Water on treated glass beads up, while it spreads on untreated glass Signup and view all the answers

What is the primary goal of an ice ingestion test in jet engine certification?

To check the balance of the rotor when ice is ingested Signup and view all the answers

Where is ice most likely to form on a jet engine's nacelle?

At the root of the compressor blades Signup and view all the answers

Which system is primarily used for anti-icing in large turbine aircraft?

Bleed air anti-icing system Signup and view all the answers

What is a potential consequence of ice formations on an engine?

Engine stalling during high pitch angles Signup and view all the answers

How does the bleed air anti-icing system function during operation?

It raises the temperature of intake air to prevent ice Signup and view all the answers

What component is heated to prevent ice formation in the thermal electric anti-icing system?

Various components of the aircraft Signup and view all the answers

What occurs if the bleed air used for anti-icing is exhausted back into the intake?

It prevents ice formation at blade roots and raises air temperature Signup and view all the answers

During ground operation, why can engine anti-icing be selected?

Because of large airflow over the intake lips even at idle Signup and view all the answers

What is a key characteristic of a dry-type engine-driven air pump?

It is constructed with carbon rotor vanes. Signup and view all the answers

Under what condition is the operational mode inhibited when the airplane has been in the air less than 10 minutes?

The airplane is in auto mode Signup and view all the answers

What happens to the WAI valves during the BITE power-up test?

The valves do not move Signup and view all the answers

Which statement about wet-type air pumps is true?

Their output air must pass through a separator to remove oil. Signup and view all the answers

How does an oil separator function in a wet-type air pump system?

It condenses oil and drains it back to the engine. Signup and view all the answers

What temperature condition could inhibit the WAI operational mode if the airplane has been airborne for less than 5 minutes?

Total Air Temperature above 50 °F Signup and view all the answers

Which of the following could cause an operational mode inhibition while the airplane is on the ground?

Initiating a periodic BITE test Signup and view all the answers

What is one maintenance requirement for an oil separator?

Clean the interior with a specified solvent. Signup and view all the answers

What happens to the control valve when the deice switch in the cockpit is energized?

It opens to allow air from the pump into the deice system. Signup and view all the answers

What type of information does the WAI system NOT provide on the onboard computer maintenance page?

TAT in real-time Signup and view all the answers

What feature is commonly combined with a control valve in deice systems?

Pressure relief valve Signup and view all the answers

What is a necessary condition for the periodic test of the WAI system to occur?

The airplane on the ground for 5 minutes or more Signup and view all the answers

What condition does NOT lead to WAI system status messages through the central maintenance computer system?

WAI valve position changes Signup and view all the answers

Which of the following describes a characteristic of both dry-type and wet-type pumps?

They are almost maintenance-free. Signup and view all the answers

Which factor is likely to enable the operational mode if all other conditions are met?

The airplane has not taken off Signup and view all the answers

What is a distinguishing feature of a distributor valve compared to a control valve?

It is specifically designed for complex deice boot systems. Signup and view all the answers

What is the primary purpose of the NORMAL heating setting in windshield heating systems?

To keep the entire windshield broad area warm Signup and view all the answers

What is one limitation of pneumatic windshield heating systems?

They are not effective in known icing conditions Signup and view all the answers

Which source of air is typically used in pneumatic windshield heat systems?

Bleed air or conditioned air from the environmental control system Signup and view all the answers

How does chemical anti-ice systems function on windshields?

By spraying liquid chemicals to prevent and deice frost Signup and view all the answers

What is the main difference between HIGH and NORMAL heating settings in aircraft windshield systems?

HIGH heating provides more intense heat to a smaller area Signup and view all the answers

What potential benefit do large aircraft equipped with pneumatic jet blast rain repellant systems gain?

Some anti-icing effects during operation Signup and view all the answers

In older aircraft, what is the function of the space between the plies of laminated windshields?

To direct hot air between the glass for warmth and fog prevention Signup and view all the answers

Which heating method is NOT typically associated with anti-icing in aircraft windshields?

Solar heating systems Signup and view all the answers

Study Notes

Ice and Rain Protection (Level 3)

Ice and rain protection is essential for aircraft safety and performance in all weather conditions
Aircraft designed for public transport and some military aircraft must have certain detection and protection systems for flights in icing conditions
Basic requirements must be met for all aircraft, ensuring stability and control balance and engine operation in icing conditions

Ice Formation and Its Effects

Ice formation on aircraft is similar to that on the ground and can be categorized as hoar frost, rime, glaze ice, or mixed icing
Factors like temperature, precipitation, and atmospheric moisture affect ice formation
Ice types and their formation are described

Ice Control Systems

Ice detector systems detect the presence of ice on critical aircraft points
Icing conditions can be detected using various types of ice detectors: temperature/moisture probes, visual (ice detection light, hot rod detector), pressure (Smiths ice detector), torque (serrated rotor), or vibration frequency (vibrating rod ice detector)
Ice protection is categorized as de-icing and anti-icing
Many methods and systems are discussed
Pneumatics, Liquid, Electrical, Electrical anti-icing and thermal anti-icing
Types of anti-icing and de-icing systems include pneumatic, liquid, electrical, and thermal systems, each aiming to protect specific areas of the aircraft (like wings, tailplane, fin, engine intakes, windshields, pitot probes, and propellers)

Typical Anti-Icing Systems

Thermal pneumatic systems use large quantities of hot air to prevent ice formation
These systems are typically used in aircraft with large turbine engines
These systems need an overheat sensor

Typical De-Icing Systems

Systems are designed to remove already formed ice from aircraft surfaces
Pneumatic systems, using boots, are commonly used
Chemical systems use a freezing point depressant to melt ice, often focused on wings, stabilizers, and windshields.

Ground De-icing of Aircraft

Procedures and methods for removing frost and ice from aircraft on the ground are described, including the use of deicing fluids and specialized equipment
Specific conditions and risks related are explained

Windshield Frost, Fog, and Ice Control Systems

Methods relating to maintaining or preventing ice formation on windshields; this includes using electric, pneumatic, and chemical systems.
Detailing different types of windshield, high performance aircraft, and transport category,
Different systems for preventing windshield icing, frost, or fog on aircraft
Features on these systems
Details on how these systems operate (like using warm air in some systems or chemical solutions in others)
The specifics of these systems (including components and controls)

Maintenance & Troubleshooting

Identifying and managing problems with de-icing systems on an aircraft. General inspection items and troubleshooting solutions are described

Removal and Installation

Specific removal and installation procedures for components of de-icing systems are presented.

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Description

Test your knowledge on fluid systems used for aircraft de-icing and windscreen wiper operations. This quiz covers maintenance tasks, precautions, and the mechanics behind effective de-icing. Perfect for aviation enthusiasts and professionals alike.