Anti Ice Flashcards
With the NACELLE ANTI-ICE Switches in AUTO, bleed air opens the nacelle anti-ice valve when icing conditions are sensed :
In Flight - FCOM II / 3.10.2 / 3.20.1
When will the nacelle anti-ice valves close after a landing in icing conditions?
Upon engine shutdown. - FCOM II / 3.10.1
With the NACELLE ANTI-ICE Switches ON :
The engine igniters operate continuously. - FCOM II / 3.10.1
What does the EICAS Advisory message >ANTI-ICE mean?
Any Nacelle Anti-ice switch or the Wing Anti-ice switch is ON, and TAT is more than 12°C and icing conditions do not exist. - FCOM II / 3.30.1
Switching the WING ANTI-ICE Switch to ON, will :
Open the wing anti-ice valves in flight, but is ineffective when leading edge flaps are extended. - FCOM II / 3.20.2 / 3.20.3
With the WING ANTI-ICE Switch in AUTO, the wing anti-ice valves open in response to inputs from the ice detection system, when :
The leading edge flaps are retracted and in flight only - FCOM II / 3.10.2
When is Nacelle Anti-Ice Manual Operation possible?
On the ground and in flight - FCOM II / 3.10.1
The WINDOW HEAT Switches Control heating for:
The windshields only.
Positioning the First Officer’s Windshield (WSHLD) Air Switch ON, will direct conditioned air to :
Only to the first officer’s windshield.
When are the two total air temperature probes electrically heated?
In flight.
Is Nacelle Anti-Ice system operation possible when the ENGINE BLEED AIR Switch is selected OFF?
Yes, except when PRV has been closed due to bleed system related failures.
What does the green NAI indication displayed beside the EICAS N1 indication mean?
Nacelle anti-ice valve is open.
The Wing Anti-Ice system can be operated manually :
Only in flight.
Side window heating is automatic and no flight deck controls are provided : (True of False)
TRUE
When are the four pitot-static probes and two angle of attack probes electrically heated?
When any engine is operating.
What should be the WING ANTI-ICE Switch position for taxiing in icing conditions?
AUTO
Describe the engine anti-ice system
when selected, NAI uses bleed air as long as the PRV valve is open
When is NAI required?
Icing conditions (10C or below and visible moisture or dew point spread < 3C) and in descent with SAT < -40C for engine flameout mitigation
What type of engine operation must be observed before takeoff with NAI on?
30 second sunup to 60% N1 at intervals no more than 30 minutes if OAT < 3C
How can you tell if NAI is on?
green NAI indication by respective N1 on primary EICAS
Does WAI operate on the ground?
no
Does WAI operate when the flaps are extended?
yes in the air but it is ineffective
When are the pitot static and angle of attack probes heated?
when any engine is operating
