Anti Ice, Rain

Question 1

When do Nacelle Anti-Ice valves open?

Answer 1

Auto - when icing condition exist 
ON with:
    - engine bleed air avail
    - igniters operating continuously 
    - PRV open

Question 2

When do Wing Anti-Ice Valves open?

Answer 2

Auto:

• in flight: with leading edge flaps retracted and wing icing conditions detected
• ground: closed

On:

• in flight: open and supply left and right wing leading edges
  
  • wing anti ice is ineffective when leading edge flaps not retracted*
• ground : closed

Question 3

When is anti ice automatically activated?

Answer 3

• when wing and engine anti-ice are in AUTO

- two ice detector probes on the forward fuselage detect icing conditions in flight

Question 4

How are flight deck windows protected from ICE?

Answer 4

• electrically heated
• forward windows have anti-icing protection on exterior surface
• anti-fogging heating on interior surface of forward and side windows
• forward windows are heated when Window Heat Switch On
• side windows automatically heated when AC system is powered

Question 5

How do you reset a forward window heat controller fault

Answer 5

Window Heat Switch off for 10 seconds, then ON

Question 6

Which probes are heated?

Answer 6

Heated electrically when any engine running:

• 4 pitot-static probes
• 2 Angle of Attack (AOA) probes

In flight
- 2 Total Air Temperature (TAT) probes

Question 7

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

Answer 7

• 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 8

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

Answer 8

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

Question 9

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

Answer 9

When nacelle icing conditions exist

Question 10

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

Answer 10

Commanded open

Question 11

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

Answer 11

Two probes are located on the forward fuselage

Question 12

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 12

IP bleed only (HP bleed valve remains closed)

Question 13

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

Answer 13

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

Question 14

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

Answer 14

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

Question 15

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

Answer 15

• Nacelle inlets

- Wing leading edges

Question 16

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

Answer 16

“NAI” for nacelle anti-ice; and

“WAI” for wing anti-ice

Question 17

Describe flight deck window heating systems

Answer 17

• 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 anti-fogging heating on the interior surfaces

Question 18

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

Answer 18

Forward windshields only

Question 19

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

Answer 19

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

Question 20

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

Answer 20

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

Question 21

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

Answer 21

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

Question 22

Will Nacelle Anti-Ice work on the ground in AUTO?

Answer 22

On Takeoff - will turn on after takeoff if ice detected

On Landing - will stay on until engine shutdown if ice detected during approach