Anti ice system

Question 1

Which parts of the aircraft does the pneumatic anti ice system heat?

Answer 1

Engine anti ice - Engine cowl lips
Wing anti ice - first 3 inboard leading edge slats

Question 2

Where does the pneumatic anti ice system get heated air from?

Answer 2

Bleed air from the 5th and 9th stage of the compressor section of engine

Question 3

Which windscreens are heated and how?

Answer 3

Front windows(1L and 1R) are electrically heated when FWD window heat is selected on

Side windows(2L and 2R) are electrically heated when side window heat is selected on. 4 and 5 would be heated by this switch if installed

Windows 3L and 3R are not heated

Question 4

What does the OVERHEAT annunciator above the window heat switches indicate and do we get a MC?

Answer 4

Respective window has overheated

MC for ANTI ICE without recall

Question 5

What does a bright L VALVE OPEN or R VALVE OPEN light indicate and do we get a MC?

Answer 5

Respective wing anti ice valve is in transit or disagreement between valve and switch position.

No MC

Question 6

What does a bright COWL VALVE OPEN light indicate and do we get a MC?

Answer 6

Respective engine anti ice valve is in transit or disagreement between valve and switch position.

No MC

Question 7

What does the COWL ANTI ICE annunciator light mean and do we get a MC?

Answer 7

overpressure condition in the duct downstream of the cowl anti ice valve.

MC for ANTI ICE without recall

Question 8

What does a dim COWL VALVE OPEN light indicate and do we get a MC?

Answer 8

Cowl anti ice valve is open with switch on

No MC

Question 9

What does a dim L VALVE OPEN or R VALVE OPEN light indicate and do we get a MC?

Answer 9

Respective wing anti valve open with switch on.

No MC

Question 10

What does it mean if the window heat ON light is extinguished?

Answer 10

Either

window heat is off or,
window has overheated or,
failure of the window heat system

Question 11

How is water removed from the windshield?

Answer 11

Wipers with permanent rain repellent coating

Question 12

Which probes are heated(unless of standby power)?

Answer 12

TAT probe
Pitot probe
Alpha vanes

Question 13

Which probes are not heated?

Answer 13

Static port

Question 14

What happens when the Engine anti switch is selected on?

Answer 14

Opens the cowl anti ice valve, routing hot bleed air to the engine cowl lip.

Changes stick shaker logic to icing conditions
Changes min manoeuvring speed bars

Question 15

When will the stick shaker logic and min manouvering speed bars revert to non icing conditions logic?

Answer 15

When the engine anti ice is switches off provided wing anti ice was not used during flight

Question 16

What do the probe heat annunciator lights indicate and do we get a MC?

Answer 16

Respective probe is not heated.

MC for ANTI ICE without recall

Question 17

How does standby power affect the probe heat annunciator lights?

Answer 17

On standby power, probe heat annunciator lights do not indicate system status

Question 18

When the windscreen wipers are switched to INT, how frequent do they activate?

Answer 18

7 second intermittent operation

Question 19

When will the wing anti ice control valves open on the ground?

Answer 19

Switch selected on and,
Thrust lever position below TO config warning activation setting and,
Wing duct temperature below thermal switch activation temp

Question 20

When will the wing anti ice switch automatically trip off if selected on during ground operations?

Answer 20

On lift off

Question 21

What will selecting wing anti ice on during flight do?

Answer 21

Opens both wing anti ice valves
Changes stick shaker activation logic to icing conditions
Adjusts min maneuvering speed bars to icing conditions
Icing condition logic remains for rest of flight regardless of switch position