# B777 Anti Ice / Rain

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When an aircraft passes through an icy environment it can build up unevenly between the wings and cause roll control issues and reduced visibility for the pilot. The quiz below is designed to test out what you learn during your training about 777 anti icing and fogging protection. Give it a try!

• 1.

### When can engine anti-ice be operated manually?

• A.

Only on the ground

• B.

Only in flight

• C.

On the ground or in flight

• D.

Only when TAT is above 10 degrees

C. On the ground or in flight
Explanation
Engine anti-ice can be operated manually both on the ground and in flight. This means that the system can be activated to prevent ice from forming on the engine during both stationary and moving conditions. The option "On the ground or in flight" indicates that the anti-ice system can be used in either situation, providing flexibility and ensuring the safety and efficiency of the engine operation. The condition of the TAT (Total Air Temperature) being above 10 degrees is not relevant to the operation of the engine anti-ice system.

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• 2.

### What does the EAI indicate when displayed on the Primary EICAS N1 indication?

• A.

The engine anti-ice is armed

• B.

The engine anti-ice is open

• C.

The engine anti-ice has failed

• D.

The engine anti-ice shut off

B. The engine anti-ice is open
Explanation
The correct answer indicates that the engine anti-ice system is open. This means that the system is actively providing anti-ice protection to the engine, preventing ice from forming and potentially causing damage.

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• 3.

### What is the position of an engine anti-ice valve when the ENGINE ANTI-ICE selector is in AUTO  and EAI is displayed?

• A.

Open

• B.

Closed

• C.

Inoperative

• D.

Cannot be determined

A. Open
Explanation
When the ENGINE ANTI-ICE selector is in AUTO and EAI is displayed, it indicates that the engine anti-ice valve is open. This means that the valve is allowing hot air from the engine to flow into the engine intake, preventing ice from forming.

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• 4.

### When can wing anti-ice be operated manually?

• A.

Only on the ground

• B.

On the ground or in the air

• C.

Only in flight

• D.

Only when TAT is above 10 degrees C

C. Only in flight
Explanation
Wing anti-ice can be operated manually only in flight. This means that the system can be activated and controlled by the pilot while the aircraft is in the air. It is not available for manual operation when the aircraft is on the ground. The other options, such as operating it on the ground or only when the TAT is above 10 degrees C, are not correct as they do not accurately describe when wing anti-ice can be operated manually.

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• 5.

### When will wing anti-ice operate automatically?

• A.

Only on the ground

• B.

Only in flight

• C.

Both on the ground and in flight

• D.

Only when TAT is above 10 degrees C

B. Only in flight
Explanation
The wing anti-ice system operates automatically only in flight. This means that the system is designed to activate and de-activate itself without any manual intervention when the aircraft is in the air. It does not operate automatically on the ground, indicating that the system needs to be manually controlled during ground operations. The answer also indicates that the system does not depend on the Total Air Temperature (TAT) being above 10 degrees Celsius for automatic operation.

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• 6.

### Which flight deck windows are heated to provide both anti-icing and anti-fogging protection?

• A.

Both forward windows

• B.

Left forward window and right pilot's side window

• C.

All windows

• D.

Left forward and side window and right forward and side window.

A. Both forward windows
Explanation
The correct answer is both forward windows. The forward windows on an aircraft's flight deck are heated to provide both anti-icing and anti-fogging protection. This is important to ensure clear visibility for the pilots during flight, especially in cold or humid conditions. By heating the windows, any ice or frost that may form on the surface is melted, preventing any obstruction to the pilots' view. Additionally, the heating helps to prevent fogging, which can occur when there is a significant difference in temperature between the inside and outside of the aircraft.

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• 7.

### Which flight deck windows are provided with a backup anti-fogging system?

• A.

All windows

• B.

Both forward windows

• C.

Left forward window and right pilot's side window

• D.

Left forward and side window and right forward and side window

B. Both forward windows
Explanation
The correct answer is "Both forward windows." This means that only the two windows at the front of the flight deck are equipped with a backup anti-fogging system. The other windows do not have this system.

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• 8.

### Why are the wipers never operated on a dry windshield?

• A.

The wiper blades will be ruined.

• B.

The wiper motor may burn out.

• C.

Windshield scratching may occur.

• D.

Bugs will be smeared all over the window.

C. Windshield scratching may occur.
Explanation
Operating the wipers on a dry windshield can lead to windshield scratching. When the wipers are turned on without any moisture on the windshield, the dry wiper blades can create friction against the glass surface. This friction can cause scratches and damage to the windshield, compromising its clarity and potentially reducing visibility while driving. Therefore, it is important to only operate the wipers when there is enough moisture on the windshield to prevent scratching.

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• 9.

### Why are the WIPER selectors set to OFF during preflight?

• A.

To avoid wiper operation on dry windshields

• B.

To avoid damage to the wiper blades

• C.

To allow the hydrophobic coating to warm up

• D.

To avoid possible injury to maintenance personnel

A. To avoid wiper operation on dry windshields
Explanation
The WIPER selectors are set to OFF during preflight to avoid wiper operation on dry windshields. This is because running the wipers on a dry windshield can cause damage to the wiper blades and the windshield itself. It is important to have moisture on the windshield for the wipers to effectively clean the glass without causing any harm. Therefore, it is necessary to keep the wiper selectors off until there is sufficient moisture on the windshield.

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• 10.

### With the R FWD window heat switch ON, what does the EICAS advisory message WINDOW HEAT R FWD indicate?

• A.

The backup antifog air system is on.

• B.

The window is still in the warm up cycle.

• C.

All window heating functions are inoperative.

• D.

Primary heat for the affected forward window heat is off.

D. Primary heat for the affected forward window heat is off.
Explanation
The EICAS advisory message WINDOW HEAT R FWD indicates that the primary heat for the affected forward window heat is off. This means that the heating function for the window is not functioning properly, which could potentially lead to visibility issues or fogging on the window.

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• 11.

### When will the EICAS advisory message ANTI-ICE ON be displayed?

• A.

TAT above 10 degrees C, all ANTI-ICE selectors OFF and ice is NOT detected

• B.

TAT above 10 degrees C, any ANTI-ICE selector ON and ice is NOT detected

• C.

TAT below 10 degrees C, all ANTI-ICE selectors ON and ice is detected

• D.

TAT below 10 degrees C, any ANTI-ICE selector OFF and ice is NOT detected

B. TAT above 10 degrees C, any ANTI-ICE selector ON and ice is NOT detected
Explanation
When the Total Air Temperature (TAT) is above 10 degrees Celsius, and any of the ANTI-ICE selectors are turned on, but no ice is detected, the EICAS advisory message ANTI-ICE ON will be displayed. This means that the aircraft's anti-ice system is activated even though there is no ice present, and it is a reminder to the pilot to turn off the anti-ice system if it is not needed.

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• 12.

### What position of the ANTI-ICE selectors will remove the ANTI-ICE ON EICAS message when the air temperature is above 10 degrees C and ice is not detected?

• A.

AUTO

• B.

ON

• C.

OFF

• D.

AUTO or OFF

A. AUTO
Explanation
When the air temperature is above 10 degrees C and ice is not detected, setting the ANTI-ICE selectors to AUTO will remove the ANTI-ICE ON EICAS message. The AUTO position allows the system to automatically control the anti-ice function based on the detected conditions. In this case, since the temperature is above 10 degrees C and no ice is detected, the system will automatically deactivate the anti-ice system, removing the message.

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• 13.

### What position should the ENGINE ANTI-ICE selectors be in for taxiing in icing conditions?

• A.

AUTO

• B.

ON

• C.

OFF

• D.

AUTO or OFF

B. ON
Explanation
In icing conditions, it is important to have the engine anti-ice system turned on while taxiing. This helps prevent ice from forming on the engine, which can disrupt its functioning and potentially cause damage. By keeping the engine anti-ice selectors in the "ON" position, the system will continuously provide warm air to the engine, preventing ice build-up and ensuring safe operation.

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• 14.

### What position should the WING ANTI-ICE selector be in for taxiing in icing conditions?

• A.

AUTO

• B.

ON

• C.

OFF

• D.

Either AUTO or ON

A. AUTO
Explanation
The WING ANTI-ICE selector should be in the AUTO position for taxiing in icing conditions. This position allows the system to automatically regulate the wing anti-ice based on the aircraft's needs. It ensures that the anti-ice system is activated when required and deactivated when not needed, providing optimal protection against ice buildup on the wings during taxiing.

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• 15.

### What action should you take if the EICAS advisory message ICE DETECTORS is displayed?

• A.

Turn all ANTI-ICE selectors to ON then back to AUTO to reset the system.

• B.

Turn all ANTI-ICE selectors OFF for remainder of flight and avoid icing.

• C.

Operate engine and wing anti ice systems manually when icing conditions are encountered.

• D.

Operate engine and wing anti ice systems manually for remainder of flight.

C. Operate engine and wing anti ice systems manually when icing conditions are encountered.
Explanation
The correct answer suggests that when the EICAS advisory message "ICE DETECTORS" is displayed, the appropriate action is to operate the engine and wing anti-ice systems manually when encountering icing conditions. This means that the pilot should manually activate the anti-ice systems to prevent ice buildup on the engine and wings during flight in icy conditions.

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• 16.

### What does the EICAS message ICE DETECTORS mean?

• A.

Ice is detected.

• B.

Ice is detected and one or both engine anti-ice selectors are OFF.

• C.

Ice detection has failed.

• D.

One or more anti-ice selectors are in ON.

C. Ice detection has failed.
Explanation
The correct answer is "Ice detection has failed." This means that the system that is responsible for detecting ice on the aircraft has malfunctioned or is not functioning properly. It does not indicate whether ice is present or not, but rather that the detection system is not able to accurately detect ice.

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• 17.

### What does the EICAS message ICING ENG indicate?

• A.

Ice detection for the engines has failed.

• B.

Ice is detected and one or both engine anti-ice selectors are OFF.

• C.

One or both engine anti-ice valves remains closed when commanded open.

• D.

Air temperature is above 10 degrees C and ice is not detected.

B. Ice is detected and one or both engine anti-ice selectors are OFF.
Explanation
The EICAS message ICING ENG indicates that ice is detected and one or both engine anti-ice selectors are OFF. This means that there is a possibility of ice forming on the engines, but the anti-ice system is not activated to prevent it. This could be a potential safety concern as ice accumulation on the engines can affect their performance and lead to engine damage or failure. It is important to have the anti-ice system turned on in such conditions to ensure safe operation of the aircraft.

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• 18.

### How many pilot or angle of attack probes are electrically heated on the ground with either engine operating?

• A.

Four probes, 2 on the left 2 on the right side.

• B.

Three probes, 2 on the left 1 on the right side.

• C.

Three probes, 1 on the left 2 on the right side.

• D.

Two probes, 1 on the left 1 on the right side.

B. Three probes, 2 on the left 1 on the right side.
Explanation
Three probes, 2 on the left 1 on the right side. This is because the question asks about the number of probes that are electrically heated on the ground with either engine operating. The answer states that there are three probes in total, with two on the left side and one on the right side that are electrically heated.

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• 19.

### Which Total Air Temperature (TAT) probes and Angle-of-Attack (AOA) sensors are electrically heated?

• A.

The TAT probe aft of the left pitot probe and the angle of attack (AOA) sensor mounted aft of and above the pitot probes on each side of the fuselage.

• B.

The TAT probe forward of the left pitot probe and the angle of attack (AOA) sensor mounted forward of and above the pitot probe on left side of the fuselage.

• C.

The TAT probes aft of the left and right pitot probes and the angle of attack (AOA) sensors mounted forward of and above the pitot probes on each side of the fuselage.

• D.

The TAT probe forward of the right pitot probe and the angle of attack (AOA) sensor mounted aft of and above the pitot probe on left side of the fuselage.

A. The TAT probe aft of the left pitot probe and the angle of attack (AOA) sensor mounted aft of and above the pitot probes on each side of the fuselage.
Explanation
The TAT probe aft of the left pitot probe and the angle of attack (AOA) sensor mounted aft of and above the pitot probes on each side of the fuselage are electrically heated.

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• 20.

### Which statement about anti-ice systems is not correct?

• A.

The wing leading edge flaps are not heated by the wing anti-ice system.

• B.

Pitot probes automatically heat electrically for anti-ice protection when either engine is operating.

• C.

The total air temperature probe is aspirated inflight by bleed air for anti-ice protection.

• D.

The automatic ice detection system is inhibited on the ground.

C. The total air temperature probe is aspirated inflight by bleed air for anti-ice protection.
Explanation
The correct answer is that the total air temperature probe is aspirated inflight by bleed air for anti-ice protection. This statement is incorrect because the total air temperature probe is not aspirated inflight by bleed air for anti-ice protection. The total air temperature probe measures the temperature of the air entering the engine, and it is not necessary to heat it for anti-ice protection.

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• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Jun 19, 2009
Quiz Created by
Gtd

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