Ice and Rain Protection Flashcards
Ice and Protection
Which elements have an anti-ice protection ?
5
- Engines
- Wings
- Pack inlets
- Flight deck windows
- Probes
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Is automatic ice detection always functional ?
NO
It is inhibited on the ground below 75 kts.
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How many ice detection probes are there ?
2
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How are the engine cores and cowl inlets ice-protected ?
By using bleed air.
Not a bleed-less aircraft after all !
Ice and Rain Protection
Apart from bleed air, do the engines have additional ice protection ?
Yes, the engine EEC also automatically adjusts idle to prevent engine icing.
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When would the engines anti-ice valves automatically close ?
- During START,
- Bleed air overtemperature,
- Bleed air overpressure,
- Bleed air leak,
- Engine FIRE SWITCH is pulled.
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WAI :
How are wing leading edges ice-protected ?
ELECTRICALLY.
Thermal anti-icing mats on 4 midwing leading edge slats.
3 thermal anti-icing mats on each slat.
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What happens if one thermal anti-icing mat fails on one side ?
To maintain aerodynamics stability, the wing anti-ice system would automatically de-power the opposite thermal mat.
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In-flight, can wing anti-ice be manually operated ?
YES
Positioning the wing anti-ice selector ON powers the system anytime TAT < 25°C
Ice and Rain Protection
Do all flight deck windows have anti-fogging protection ?
YES, all flight deck windows have interior anti-fogging protection.
Ice and Rain Protection
Do all flight deck windows have anti-icing protection ?
NO, only the L/R FWD windows have exterior anti-ice protection.
Ice and Rain Protection
When is the TAT probe electrically heated ?
When the aircraft is in flight.
Ice and Rain Protection
When are the pitot probes electrically heated ?
When either engine is operating.
How many ice detection systems are fitted to the aircraft?
Two
When is automatic ice detection inhibited on the ground?
Below 75kts
Which anti-ice systems are controlled by automatic ice detection?
Engine, wing and pack inlet anti-ice
When are the ice detectors heated?
They are electrically heated after engine start
What is the heat source for engine anti-ice?
Bleed air
Which section of the engine is de-iced?
Engine core & cowl inlet
Can engine anti-ice be used on the ground?
Yes, in MANUAL mode
What indicates that engine anti-ice is on?
EAI is displayed above the EICAS N1 indication
What happens to the engine idle setting when engine anti-ice is on?
The engine EEC automatically adjusts idle to prevent icing
If there is a leak in the engine anti-ice…a. how is it detected?b. what is the automatic action? c. what is the indication?
a. Duct leak detection system.b. Engine anti-ice valve closesc. EICAS message ANTI-ICE LEAK ENG L, R.
What is the heat source for wing anti-ice?
Electrically powered thermal anti-icing mats
Which areas are anti-iced on the wing?
Four midwing leading edge slats on each wing
When is automatic wing anti-ice available?
In flight and on the ground above 75kts
What happens if a wing anti-ice thermal mat fails?
The system automatically de-powers the opposite thermal mat to prevent asymmetrical wing icing.
What is the cockpit indication when wing anti-ice is operating?
WAI is displayed below the EICAS N1 indication
With flaps out of up and engine or wing anti-ice ON, what happens to the stick shaker logic?
Stick shaker speed and minimum maneuvering speed is increased. This reduces maneuver margin to stick shaker.
What provides pack ram air inlet anti-ice protection?
Electric heaters on the leading edge of each inlet
When is pack inlet anti-icing inhibited?
On the ground and when TAT is above 10°C
What is the indication for:a. A failed window heater?b. Twoormorefailedwindowheaters?
a. INOP light and appropriate EICAS message.b. INOP lights and EICAS WINDOW HEAT message.
When is window heat applied?
Window heat switches in the ON position, the primary system operates automatically
Which windows have backup antifogging?
The forward windows.
How is backup antifogging activated?
Automatically when the BACKUP L FWD and R FWD switches in the ON position.
Which wiper selections are available?
OFF, INT (Intermittent), LOW and HIGH
When is power applied to the pitot and angle of attack probes?
When either engine is running
When is power applied to the TAT probe?
In flight
