ANTI-ICE/WINDOW HEAT

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 the EEC,
operate continuously.
• PRV opens when anti-ice valve is open.

FCOM, VOL 2; 3.10.2

Question 2

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

Answer 2

• Prior or present bleed air overheat
• Start valve not closed
• HP bleed air valve failed openFCOM, VOL 2; 3.10.2

Question 3

With the Nacelle Anti-Ice Switches in AUTO during icing conditions, while on the ground, prior to takeoff, would the system be on or off?

Answer 3

• OFF, on the ground.

FCOM, VOL 2; 3.10.2

Question 4

If in the NAI AUTO position, with the anti-ice valves open at touchdown, when do the valves close?

Answer 4

• Valves remain open until engine shutdown.

FCOM, VOL 2; 3.10.2?

Question 5

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

Answer 5

• Two probes are located on the forward fuselage

FCOM, VOL 2; 3.20.1

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)

FCOM, VOL 2; 3.20.2

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.

FCOM, VOL 2; 3.20.3

Question 8

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

Answer 8

• No, on the ground, WAI system is inhibited

FCOM, VOL 2; 3.10.3

Question 9

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

Answer 9

• Nacelle inlets
• Wing leading edges.FCOM, VOL 2; 3.20.1

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.

FCOM, VOL 2; 3.20.1/3

Question 11

Describe flight deck window heating systems?

Answer 11

• Flight deck forward windows are electrically heated when the WINDOW HEAT
switch is ON,
• 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

FCOM, VOL 2; 3.20.3

Question 12

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

Answer 12

• Forward windshields only

FCOM, VOL 2; 3.30.3

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.FCOM, VOL 2; 3.20.2?

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.

FCOM, VOL 2, 3.20.3

Question 15

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

Answer 15

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

FCOM, VOL 2; 3.20.3