Anti-Ice / Window Heat

Question 1

Describe what happens when nacelle anti ice is commanded on?

Answer 1

-NAI valve opens
- selected engine igniters operate continuously
-Engine PRV opens when the NAI valve is open

Question 2

The 747-8 EICAS msg BLD LOW TEMP indicates ______?

Answer 2

Engine bleed air too low for sufficient wing anti-icing

Question 3

Does the Nacelle Anti-Ice AUTO position function on the ground?

Answer 3

No, the AUTO function only works in flight

Question 4

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

Answer 4

Two probes are located on the forward fuselage

Question 5

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

Answer 5

• 2 angle of attack probes
• electrically heated when ANY engine is operating

Question 6

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

Answer 6

• 4 pitot-static probes
• electrically heated when ANY engine is operating

Question 7

Window heat ON switches provide both anti-icing and anti-fogging protections to which flight deck windows?

Answer 7

Forward left and right windshields only

Question 8

On the -400, what indications are displayed on primary EICAS, when the nacelle anti-ice and/or the wing anti-ice valve is open?

Answer 8

“NAI” - nacelle anti ice
“WAI” - wing anti ice

Question 9

On the -8, what indications are displayed on primary EICAS, when the nacelle anti-ice and/or the wing anti-ice valve is open?

Answer 9

“EAI” - nacelle anti ice
“WAI” - wing anti ice

Question 10

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

Answer 10

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

Question 11

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

Answer 11

No, on the ground, WAI is inhibited.