Aircraft De-Icing Systems Quiz

The Wing Anti-Icing (WAI) System will be automatically inhibited when the airplane is on the ground, and the auto or on option is selected, unless it is during a built-in test.

If the airplane is in the air for less than 10 minutes and has auto or on selected, the WAI will be inhibited if the total air temperature is greater than 50°F and the time since takeoff is less than 5 minutes.

The WAI system will inhibit if the airplane is on the ground and any of the following conditions occur: auto slat operation, air-driven hydraulic pump operation, a running engine, or the bleed air temperature is less than 200°F.

The WAI system can be monitored on the onboard computer maintenance page by the aircrew.

The WAI system is continuously monitored by BITE circuits in the WAI ACIPS computer card.

A power-up test occurs when the card receives power, a periodic test occurs every 24 hours, and cycle open and close tests occur when the airplane is on the ground and the WAI is in auto or on mode, for at least one minute, with sufficient bleed pressure to open the WAI valves.

The WAI system includes multiple components like the WING MANIFOLD PRESS, VALVE, AIR PRESS, and AIR FLOW , which can be monitored on the onboard computer.

Faults that affect the dispatch of the aircraft cause BITE status messages. Other faults cause CMCS maintenance messages.

Ice formation on an engine's intake can disrupt airflow, potentially causing the engine to stall, especially at high pitch angles.

The most likely place for ice to form on an engine is the intake lip, where airflow slows down, allowing moisture to freeze.

The part of the engine that collects airflow before it reaches the compressor blades.

A system that uses hot air from the engine to prevent ice formation on the intake.

A system that uses electricity to heat engine components and prevent ice formation.

A component in the engine intake that helps direct airflow to the compressor.

In the context of engine anti-icing, it refers to the airflow's reduction due to hot air being released outside the engine.

The system used to prevent ice formation on turbine engines.

A dry-type air pump is used in most modern GA aircraft to provide air for the de-icing system. It is designed to be oil-free, achieved through the use of carbon rotor vanes and bearings which wear at a controlled rate to provide lubrication. This eliminates the need for an oil separator and ensures that the de-icing system remains free of contaminants.

A wet-type air pump utilizes engine oil for lubrication, requiring an oil separator to remove oil from the air before it reaches the de-icing system.

An oil separator is a crucial component in wet-type air pump systems. It filters out oil from the compressed air by using a convoluted interior design that condenses the oil and drains it back to the engine.

A solenoid-operated valve that controls the flow of pressurized air from the pump to the de-icing system. When energized by the deice switch in the cockpit, the valve opens, allowing the air to flow to the de-icing system.

A special type of control valve used in more complex de-icing boot systems, distributing the pressurized air to multiple locations.

A critical safety feature, the pressure relief valve prevents overpressure build-up in the de-icing system. Often incorporated into the control valve, it releases excess pressure, preventing potential damage.

Both dry-type and wet-type air pumps are designed to require minimal maintenance. However, regular inspections for bolt security and hose connection integrity are essential for proper operation.

The dry-type air pump provides the advantage of ensuring an oil-free de-icing system, minimizing the potential for contamination and related issues. While wet-type pumps require an oil separator, they offer a longer overhaul lifespan.

Two separate systems operate each pilot's windshield wiper to ensure clear vision in case of a system failure.

The wiper arm, motor, and blade are key components of a windshield wiper system.

Most aircraft use electric motors to power windshield wipers, but some older models use hydraulic motors.

Regular checks, adjustments, and troubleshooting keep the windshield wiper system functioning properly.

A chemical rain repellant creates a film on the windshield that repels water, forming beads that are easily removed by the slipstream, leaving a clear view.

The rain repellant is applied using a switch or push button in the cockpit.

The slipstream, the high-velocity air flowing over the aircraft, helps remove water beads from the windshield.

A chemical rain repellant helps maintain visibility by promoting water bead formation and removing them with the slipstream.

A fluid reservoir, pump, control valve, filter, and relief valve are key components of a typical anti-icing system. Other components may be present.

A windshield heating system with two levels: NORMAL for a wider area and HIGH for a smaller, critical area. The system is usually always on and set to NORMAL.

A system that uses heated air, often from engine bleed air, to keep the windshield warm and fog-free. Typically used on older aircraft.

A system that sprays a chemical liquid onto the outside of the windshield to prevent or remove ice formation. Common on smaller aircraft.

Provides intense heat to a smaller, crucial area of the windshield, often used for essential viewing during critical weather conditions.

Provides a broader, less intense heat to the majority of the windshield.

While effective in preventing fog and frost, this system is not designed or approved for use during known icing conditions.

Air that is drawn from the engine and directed to the windshield to keep it warm and defogged.

This system uses the force of the jet exhaust to deflect rain off the windshield, offering some anti-icing benefits. However, electric windshield heat is usually preferred.