Anti- Ice / Rain ***

Question 1

What happens when you turn the nacelle anti-ice switches on?

Answer 1

• NAI valve opens when the bleed air pressure is available.
• Engine igniters selected by the Auto Ignition selector and EEC operate continuously.
• PRV opens when anti-ice is ON.

Question 2

What conditions would prevent the PRV from opening when nacelle anti-ice is on?

Answer 2

• Prior or present bleed air overheat
• Start valve not closed
• HP bleed air valve failed open

Question 3

With the Nacelle Anti-Ice Switches in AUTO during icing conditions inflight, when will the system operate?

Answer 3

• When nacelle icing conditions exist

Question 4

When a Nacelle Anti-ice switch is ON, the respective nacelle anti-icing valve is:

Answer 4

• Commanded open.

Question 5

How many ice detection probes are there, and where are they located?

Answer 5

• Two probes are located on the forward fuselage left and right

Question 6

If the engine bleed air valve is closed, and nacelle anti-ice is commanded, what is the source of bleed air for nacelle anti-ice?

Answer 6

• IP bleed only (HP bleed valve remains closed)

Question 7

Is wing anti-ice effective with the leading edge flaps extended?

Answer 7

• No, wing anti-ice is ineffective when the LEF are not retracted.

Question 8

Can you operate the wing anti-ice system on the ground?

Answer 8

• No, on the ground, the system is off and the wing anti-ice valves are closed

Question 9

What part of the engine and wing are heated with NAI and WAI?

Answer 9

• Nacelle inlets

* Wing leading edges

Question 10

What is displayed on primary EICAS when the nacelle anti-ice and/or the wing anti-ice valve is open?

Answer 10

• “NAI” for nacelle anti-ice; and “WAI” for wing anti-ice.

Question 11

Describe flight deck window heating systems.

Answer 11

• Flight deck windows are electrically heated
• Forward windshields have anti-ice protection on the exterior surfaces
• Forward windshields have anti-fogging on the interior surfaces.
• Side windows have controlled anti-fogging heating on the interior surfaces

Question 12

What windows’ heating system is controlled by the window heat switches?

Answer 12

• Forward windshields only

Question 13

Since the forward windshields are controlled by the window heat switches, how do we heat the side windows?

Answer 13

• Side window heating is automatic.
• No flight deck controls are provided
• System is powered whenever the AC electrical system is powered.

Question 14

How many pitot-static probes are provided, and when are they heated?

Answer 14

• 4 pitot-static probes, electrically heated when any engine is operating.

Question 15

How many angles of attack probes are provided, and when are they heated?

Answer 15

• 2 angle of attack probes are heated when any engine is operating.

Question 16

NAI: AUTO (On Ground)

Answer 16

System OFF. When NAI valve is open following a landing, it remains on until engine shutdown.

Question 17

NAI: AUTO (In Flight)

Answer 17

NAI operates in response to ice detection.

Question 18

NAI: ON

Answer 18

• Valve Opens
• Ignitors operate continuously
• PRV opens

Question 19

3 times PRV won’t open for NAI activation?

Answer 19

• Bleed Air Overheat
• Start Valve not closed
• HP bleed valve failed open

Question 20

WAI: AUTO (In Flight)

Answer 20

Open valves in flight with ice detection if:

- Leading edge flaps retracted

Question 21

WAI: AUTO (On Ground)

Answer 21

Inhibited

Question 22

WAI: ON (On Ground)

Answer 22

Inhibited

Question 23

WAI: ON (In Flight)

Answer 23

Valves OPEN regardless of leading flap position but only effective if flaps are retracted.

Question 24

WAI Valve Light (Amber)

Answer 24

Either WAI valve position disagrees with switch position.

Question 25

NAI Valve Light (Amber)

Answer 25

Respective NAI valve position disagrees with switch position.

Question 26

What happens if fault or overheat of fwd/side window heat occurs?

Answer 26

Power is disconnected | INOP Light on Switch

Question 27

How do you reset system after a fault/overheat of window heat?

Answer 27

Push window heat switch to turn OFF for 10 seconds, then back ON.

Question 28

Where is windshield washer reservoir?

Answer 28

Behind door in book storage of captain side panel.

Question 29

When are anti-ice probes (AOA, Pitot/Static/TAT) heated?

Answer 29

- When any engine is running. | - TAT on in flight.

Question 30

When is the TAT probe heated?

Answer 30

In flight only

Question 31

How do we turn on the pitot heat?

Answer 31

They are on automatically anytime any engine is operating.

Question 32

What is powered with the Window Heat switches ON? What is de-powered with the switched OFF?

Answer 32

ON: Controlled Heat is applied to the windshield. *Only the front two windows are heated for anti-ice (exterior) and anti-fog (interior). 1L an 1R Side windows are constantly heated and has anti-fog (interior). Heat to side windows is automatic whenever AC power is on the airplane. Side window heat has no cockpit control. OFF: Off for 10 seconds resets a heat controller fault

Question 33

What does the INOP light in the Window Heat switch mean?

Answer 33

The switch is off, or An overheat has occurred, or A system fault has occurred.

Question 34

What do the Washer switches do in the ON position?

Answer 34

Washer Fluid is applied to the respective windshield. The switch is spring loaded to the neutral position.

Question 35

What do the OFF, LO, and HI positions of the Wiper switches do?

Answer 35

OFF: Off and sequence to the stowed position. LO: Operates at low speed HI: Operates at high speed

Question 36

What does the Wing Anti-Ice switch do when pressed IN/OUT?

Answer 36

Out=OFF: Wing Anti-Ice valve commanded closed IN=ON: In flight WAI valve opens to supply bleed air to leading edges of wing **On ground: system is OFF and WAI valves closed regardless of position of switch.

Question 37

What do the OFF, AUTO, and ON positions of the Nacelle Anti-Ice Switches do?

Answer 37

OFF: NAI valve commanded closed AUTO: In flight the system operates when nacelle icing conditions exist and the ON position requirements are met. ON:NAI valve opens when bleed pressure is available and PRV is open. . . . . . PRV may be closed due to current or prior bleed duct overheat, starter valve not closed, or engine High Pressure bleed valve stuck open. ON: Selected engine ignitors operate continuously **System works on the ground or in flight in the ON position.