Ice and Rain Protection

Question 1

Ice and Protection

Which elements have an anti-ice protection ?

Answer 1

5

1. Engines
2. Wings
3. Pack inlets
4. Flight deck windows
5. Probes

Question 2

Ice and Rain Protection

Is automatic ice detection always functional ?

Answer 2

NO

It is inhibited on the ground below 75 kts.

Question 3

Ice and Rain Protection

How many ice detection probes are there ?

Answer 3

2

Question 4

Ice and Rain Protection

How are the engine cores and cowl inlets ice-protected ?

Answer 4

By using bleed air.

Not a bleed-less aircraft after all !

Question 5

Ice and Rain Protection

Apart from bleed air, do the engines have additional ice protection ?

Answer 5

Yes, the engine EEC also automatically adjusts idle to prevent engine icing.

Question 6

Ice and Rain Protection

When would the engines anti-ice valves automatically close ?

Answer 6

• During START,
• Bleed air overtemperature,
• Bleed air overpressure,
• Bleed air leak,
• Engine FIRE SWITCH is pulled.

Question 7

Ice and Rain Protection

WAI :
How are wing leading edges ice-protected ?

Answer 7

ELECTRICALLY.
Thermal anti-icing mats on 4 midwing leading edge slats.
3 thermal anti-icing mats on each slat.

Question 8

Ice and Rain Protection

What happens if one thermal anti-icing mat fails on one side ?

Answer 8

To maintain aerodynamics stability, the wing anti-ice system would automatically de-power the opposite thermal mat.

Question 9

Ice and Rain Protection

In-flight, can wing anti-ice be manually operated ?

Answer 9

YES

Positioning the wing anti-ice selector ON powers the system anytime TAT < 25°C

Question 10

Ice and Rain Protection

Do all flight deck windows have anti-fogging protection ?

Answer 10

YES, all flight deck windows have interior anti-fogging protection.

Question 11

Ice and Rain Protection

Do all flight deck windows have anti-icing protection ?

Answer 11

NO, only the L/R FWD windows have exterior anti-ice protection.

Question 12

Ice and Rain Protection

When is the TAT probe electrically heated ?

Answer 12

When the aircraft is in flight.

Question 13

Ice and Rain Protection

When are the pitot probes electrically heated ?

Answer 13

When either engine is operating.

Question 14

How many ice detection systems are fitted to the aircraft?

Answer 14

Two

Question 15

When is automatic ice detection inhibited on the ground?

Answer 15

Below 75kts

Question 16

Which anti-ice systems are controlled by automatic ice detection?

Answer 16

Engine, wing and pack inlet anti-ice

Question 17

When are the ice detectors heated?

Answer 17

They are electrically heated after engine start

Question 18

What is the heat source for engine anti-ice?

Answer 18

Bleed air

Question 19

Which section of the engine is de-iced?

Answer 19

Engine core & cowl inlet

Question 20

Can engine anti-ice be used on the ground?

Answer 20

Yes, in MANUAL mode

Question 21

What indicates that engine anti-ice is on?

Answer 21

EAI is displayed above the EICAS N1 indication

Question 22

What happens to the engine idle setting when engine anti-ice is on?

Answer 22

The engine EEC automatically adjusts idle to prevent icing

Question 23

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?

Answer 23

a. Duct leak detection system.b. Engine anti-ice valve closesc. EICAS message ANTI-ICE LEAK ENG L, R.

Question 24

What is the heat source for wing anti-ice?

Answer 24

Electrically powered thermal anti-icing mats

Question 25

Which areas are anti-iced on the wing?

Answer 25

Four midwing leading edge slats on each wing

Question 26

When is automatic wing anti-ice available?

Answer 26

In flight and on the ground above 75kts

Question 27

What happens if a wing anti-ice thermal mat fails?

Answer 27

The system automatically de-powers the opposite thermal mat to prevent asymmetrical wing icing.

Question 28

What is the cockpit indication when wing anti-ice is operating?

Answer 28

WAI is displayed below the EICAS N1 indication

Question 29

With flaps out of up and engine or wing anti-ice ON, what happens to the stick shaker logic?

Answer 29

Stick shaker speed and minimum maneuvering speed is increased. This reduces maneuver margin to stick shaker.

Question 30

What provides pack ram air inlet anti-ice protection?

Answer 30

Electric heaters on the leading edge of each inlet

Question 31

When is pack inlet anti-icing inhibited?

Answer 31

On the ground and when TAT is above 10°C

Question 32

What is the indication for:a. A failed window heater?b. Twoormorefailedwindowheaters?

Answer 32

a. INOP light and appropriate EICAS message.b. INOP lights and EICAS WINDOW HEAT message.

Question 33

When is window heat applied?

Answer 33

Window heat switches in the ON position, the primary system operates automatically

Question 34

Which windows have backup antifogging?

Answer 34

The forward windows.

Question 35

How is backup antifogging activated?

Answer 35

Automatically when the BACKUP L FWD and R FWD switches in the ON position.

Question 36

Which wiper selections are available?

Answer 36

OFF, INT (Intermittent), LOW and HIGH

Question 37

When is power applied to the pitot and angle of attack probes?

Answer 37

When either engine is running

Question 38

When is power applied to the TAT probe?

Answer 38

In flight