Anti-Ice and Rain Protection

Question 1

This module introduces the onboard systems that provide ice and rain protection.
The aircraft is equipped with the following types of Ice Protection.
Wing Anti-ice; Engine Anti-ice, Probe Heat, and Flight Deck Window Heat.
The aircraft is equipped with specially coated windows and Windshield Wipers to provide the function of rain protection.

Answer 1

This module introduces the onboard systems that provide ice and rain protection.
The aircraft is equipped with the following types of Ice Protection.
Wing Anti-ice; Engine Anti-ice, Probe Heat, and Flight Deck Window Heat.
The aircraft is equipped with specially coated windows and Windshield Wipers to provide the function of rain protection.

Question 2

Wing Anti-ice can only operate in flight.

The conditions that require operation of Wing Anti-ice are shown on this frame.

Answer 2

Wing Anti-ice can only operate in flight.

The conditions that require operation of Wing Anti-ice are shown on this frame.

Question 3

The controls for Wing Anti-ice are located on the Overhead panel, and when operating, the indications appear just below the EICAS N1 display.
The Wing Anti-ice system can operate automatically or can be selected ON/OFF manually by the crew.

Answer 3

The controls for Wing Anti-ice are located on the Overhead panel, and when operating, the indications appear just below the EICAS N1 display.
The Wing Anti-ice system can operate automatically or can be selected ON/OFF manually by the crew.

Question 4

The Wing Anti-ice system operates through the delivery of hot air to the midwing slats.
The hot air for wing anti-ice is provided by the pneumatic system.
Notice this diagram and how the air is routed to each wing through a separate control valve.

Answer 4

The Wing Anti-ice system operates through the delivery of hot air to the midwing slats.
The hot air for wing anti-ice is provided by the pneumatic system.
Notice this diagram and how the air is routed to each wing through a separate control valve.

Question 5

Engine Anti-ice can operate on the ground or in flight.

The conditions that require operation of Engine Anti-ice are shown on this frame.

Answer 5

Engine Anti-ice can operate on the ground or in flight.

The conditions that require operation of Engine Anti-ice are shown on this frame.

Question 6

Heating to the Probes is provided by electrical conductive heating. Take note of which items are heated.
There are no controls for the operation of Probe Heat.
Indications are provided on the EICAS when one or more probe heaters are not operating.

Answer 6

Heating to the Probes is provided by electrical conductive heating. Take note of which items are heated.
There are no controls for the operation of Probe Heat.
Indications are provided on the EICAS when one or more probe heaters are not operating.

Question 7

Probe Heat automatically operates when either engine is operating, however the TAT is not heated on the ground. The level of heat provided to the pitot probes is automatically set a lower level on the ground to protect from over heating the elements. Full heat level is provided in flight.
The AOA vanes are heated on the ground and inflight when either engine is operating. The AOA has only one temperature level.

Answer 7

Probe Heat automatically operates when either engine is operating, however the TAT is not heated on the ground. The level of heat provided to the pitot probes is automatically set a lower level on the ground to protect from over heating the elements. Full heat level is provided in flight.
The AOA vanes are heated on the ground and inflight when either engine is operating. The AOA has only one temperature level.

Question 8

Windshield Heat is provided by electric resistance coatings.
The forward windows have external surface heating to provide anti-ice protection, while all windows are provided with internal surface heating that provide anti-fog protection.

Answer 8

Windshield Heat is provided by electric resistance coatings.
The forward windows have external surface heating to provide anti-ice protection, while all windows are provided with internal surface heating that provide anti-fog protection.

Question 9

The Window Heat switches control the application of heat to the associated windows.
These switches are normally on for all flight operations.
Indications for Window Heat failures appear on EICAS.

Answer 9

The Window Heat switches control the application of heat to the associated windows.
These switches are normally on for all flight operations.
Indications for Window Heat failures appear on EICAS.

Question 10

Rain Protection is provided by independent Windshield Wipers and hydrophobic coating on the window surface.

Answer 10

Rain Protection is provided by independent Windshield Wipers and hydrophobic coating on the window surface.

Question 11

The AUTO position is normally selected after takeoff.

Answer 11

The AUTO position is normally selected after takeoff.

Question 12

First, you should know that the automatic ice detection system detects airplane icing in flight and does not operate on the ground.
The Automatic Ice Detection system provides signals to control the engine and wing anti-ice systems when those systems are selected to the automatic mode.
Notice the available switch positions for the Wing and Engine Anti-ice.

Answer 12

First, you should know that the automatic ice detection system detects airplane icing in flight and does not operate on the ground.
The Automatic Ice Detection system provides signals to control the engine and wing anti-ice systems when those systems are selected to the automatic mode.
Notice the available switch positions for the Wing and Engine Anti-ice.

Question 13

Engine Anti-ice must be in AUTO or ON when the TAT is 100 C or less and icing conditions exist or are anticipated, except during climb, cruise and descent when the temperature is below -400 C SAT.

Do not use anti-ice if OAT or TAT exceeds 100 C (500 F).

During ground operations in icing conditions (including taxi-in and taxi-out), each engine must be run up momentarily to a minimum of 50% N1 at intervals not to exceed 15 minutes.

Answer 13

Engine Anti-ice must be in AUTO or ON when the TAT is 100 C or less and icing conditions exist or are anticipated, except during climb, cruise and descent when the temperature is below -400 C SAT.

Do not use anti-ice if OAT or TAT exceeds 100 C (500 F).

During ground operations in icing conditions (including taxi-in and taxi-out), each engine must be run up momentarily to a minimum of 50% N1 at intervals not to exceed 15 minutes.

Question 14

On the ground or in flight, turning the ENGINE ANTI-ICE selectors ON allows engine bleed air to anti-ice the engine cowl inlets.
The selectors must be ON for the engine anti-ice system to operate on the ground, since AUTO does not operate on the ground.

Answer 14

On the ground or in flight, turning the ENGINE ANTI-ICE selectors ON allows engine bleed air to anti-ice the engine cowl inlets.
The selectors must be ON for the engine anti-ice system to operate on the ground, since AUTO does not operate on the ground.

Question 15

In flight, when the ENGINE ANTI-ICE selector is in AUTO, engine anti-ice system operation is automatic.
When ice is detected more than once by the ice detectors, the engine anti-ice valves open and bleed air is automatically supplied to the engine cowl inlets.
When ice is no longer detected, the engine anti-ice valves close and bleed air is no longer supplied.

Answer 15

In flight, when the ENGINE ANTI-ICE selector is in AUTO, engine anti-ice system operation is automatic.
When ice is detected more than once by the ice detectors, the engine anti-ice valves open and bleed air is automatically supplied to the engine cowl inlets.
When ice is no longer detected, the engine anti-ice valves close and bleed air is no longer supplied.

Question 16

When the Engine Anti-ice is on (either in the Auto or Manual mode), the Engine is selected to Approach Idle by the EEC.

Answer 16

When the Engine Anti-ice is on (either in the Auto or Manual mode), the Engine is selected to Approach Idle by the EEC.

Question 17

Each engine has a dual loop anti-ice system duct leak detection system.
If an anti-ice duct leak is detected, the affected engine anti-ice valve closes.

Answer 17

Each engine has a dual loop anti-ice system duct leak detection system.
If an anti-ice duct leak is detected, the affected engine anti-ice valve closes.

Question 18

The wing anti-ice system provides bleed air to three midwing leading edge slats on each wing.
Wing anti-ice can be operated in flight only. It is inhibited on the ground.

Answer 18

The wing anti-ice system provides bleed air to three midwing leading edge slats on each wing.
Wing anti-ice can be operated in flight only. It is inhibited on the ground.

Question 19

The Wing Anti-ice system is controlled by the Wing Ant-ice switch. The switch has 3 positions.
The bleed air for Wing Anti-ice comes from the Pneumatic System ducting and flows to each wing through a separate anti-ice valve.
On this frame you can manually turn the Wing Anti-ice ON and OFF to see the affect.

Answer 19

The Wing Anti-ice system is controlled by the Wing Ant-ice switch. The switch has 3 positions.
The bleed air for Wing Anti-ice comes from the Pneumatic System ducting and flows to each wing through a separate anti-ice valve.
On this frame you can manually turn the Wing Anti-ice ON and OFF to see the affect.

Question 20

f the total air temperature (TAT) is above 10°C, both Manual and Automatic wing anti-ice operation is inhibited for five minutes after takeoff.
The TAT inhibit is removed any time TAT drops below 10°C.

Answer 20

f the total air temperature (TAT) is above 10°C, both Manual and Automatic wing anti-ice operation is inhibited for five minutes after takeoff.
The TAT inhibit is removed any time TAT drops below 10°C.

Question 21

An additional wing anti-ice inhibit for Automatic Wing Anti-ice operation (independent of the TAT inhibit), is active during the takeoff phase of flight.
Automatic wing anti-ice operation is inhibited for 10 minutes after takeoff.
Manual wing anti-ice operation is not affected by this inhibit.

Answer 21

An additional wing anti-ice inhibit for Automatic Wing Anti-ice operation (independent of the TAT inhibit), is active during the takeoff phase of flight.
Automatic wing anti-ice operation is inhibited for 10 minutes after takeoff.
Manual wing anti-ice operation is not affected by this inhibit.

Question 22

If a bleed source is lost and bleed duct isolation has not occurred, the pneumatic system isolation valves automatically open to maintain anti-icing to both wings.

Answer 22

If a bleed source is lost and bleed duct isolation has not occurred, the pneumatic system isolation valves automatically open to maintain anti-icing to both wings.

Question 23

Whether the system is operating in Manual or Auto, if one wing anti-ice valve fails closed, the wing anti-ice system automatically closes the other valve to prevent asymmetrical wing anti-icing.

Answer 23

Whether the system is operating in Manual or Auto, if one wing anti-ice valve fails closed, the wing anti-ice system automatically closes the other valve to prevent asymmetrical wing anti-icing.

Question 24

All flight deck windows are electrically heated.
Of the windows, only the forward windows have exterior surface anti-icing.
Additionally, the forward windows have exterior and interior surface anti-fogging protection.
The side windows have interior surface anti-fogging protection only.

Answer 24

All flight deck windows are electrically heated.
Of the windows, only the forward windows have exterior surface anti-icing.
Additionally, the forward windows have exterior and interior surface anti-fogging protection.
The side windows have interior surface anti-fogging protection only.

Question 25

An INOP light illuminates in the respective switch when the switch is OFF or when it is ON but there is a failure of the respective window heat, or an overheat is detected.

Answer 25

An INOP light illuminates in the respective switch when the switch is OFF or when it is ON but there is a failure of the respective window heat, or an overheat is detected.

Question 26

The probes are automatically heated with either engine operating. There is no control switch for probe heat. Note: the TAT probe is not heated on the ground.
Failures of probe heat are indicated on the EICAS.
On the ground, the pitot probe heat is provided at reduced power to avoid overheating.
In flight, pitot probe heat is provided at full power.

Answer 26

The probes are automatically heated with either engine operating. There is no control switch for probe heat. Note: the TAT probe is not heated on the ground.
Failures of probe heat are indicated on the EICAS.
On the ground, the pitot probe heat is provided at reduced power to avoid overheating.
In flight, pitot probe heat is provided at full power.