Ice and Rain Protection Systems

Question 1

what anti ice provided?

Answer 1

Wing leading edges
Engine intake cowls
Air data probes and sensors
Windshield and windows

Question 2

what is used for anti icing? For wings and cowls?

Answer 2

14th stage bleed air

Question 3

Where do electric anti icing provide?

Answer 3

Windshields, windows, air data probes, sensors

Question 4

where are the controls and indications of anti ice?

Answer 4

Anti ice panel and wiper panel

Question 5

What is the ice detection system?

Answer 5

Monitors and alerts pilots for icing

Question 6

Where are the ice detector probes?

Answer 6

On each side of the airplane

Question 7

When ice is detected what is generated?

Answer 7

Ice caution or ice advisory

Question 8

When do we have ice caution message?

Answer 8

Icing conditions detected

Wing and cowl anti ice is selected off

Question 9

When does the ice advisory message is generated?

Answer 9

Icing conditions detected

Wing and cowl anti is selected on

Question 10

What do you see on EICAS when icinf conditions are no longer detected?

Answer 10

“ICE” caution and advisory

Question 11

Question 12

What is the purpose of 14th stage shutoff valves?

Answer 12

allows bleed air to pressurize the anti ice ducts for their respective side

Question 13

How do you control the 14th stage shutoff valve?

Answer 13

On the bleed air panel

Question 14

what is the purpose of wing and anti ice valve?

Answer 14

left and right and anti ice ducts. Controlled by the Wing Anti Ice System

Question 15

What is the purpose of 14 stage isolation valve?

Answer 15

Allow both wings to be anti iced using one bleed source

Question 16

How the wing and cowl anti icing valves are identified?

Answer 16

Color cyan and label CMD

Question 17

What do the wing and cowl anti ice color and label indicate?

Answer 17

Commanded position. Not actual

Question 18

What is at least required for 14th stage isolation valve?

Answer 18

One wing anti-ice valve

Question 19

14th stage SOVs fail open, wing anti ice valves fail closed and the isolation valve fails in the last commanded position

Question 20

Question 21

Question 22

What are the two modes that can be selected? for wing anti ice

Answer 22

Normal mode and standby mode

Question 23

What is normal mode?

Answer 23

When wing anti ice required, normal mode is selected for valves to maintain a constant temperature

Question 24

what is standby mode?

Answer 24

Used when directed by QRH

controls the wing anti ice valves to maintain a lower temperature across the leading edge than the normal mode

Question 25

Question 26

Where can you see wing-ice EICAS indications?

Answer 26

Primary, status and anti ice synoptic page

Question 27

Wing Anti Ice primary page

Answer 27

Wing Inti Ice is selected: Amber gauges from 0-77.9%

Question 28

What is the purpose of amber color on the arc?

Answer 28

For sufficient bleed air to the system: N2 should be 78% or greater

Question 29

Wing Anti Ice status page

Answer 29

Appropriate advisory messages

Question 30

Question 31

What is thrust reverser override?

Answer 31

During a rejected takeoff or landing 14th stage bleed air is redirected to thrust reverser Anti Ice will reactivate once trust verses are stowed

Question 32

What is bleed air leak detection?

Answer 32

Single loop configuration with heat sensing loops detect air leak

Question 33

Question 34

Explain Cowl Anti Ice and Fail Open. Where do we turn them on?

Answer 34

14th bleed air | failed open to allow continuous air

Question 35

What is the purpose of pressure relief valve?

Answer 35

If Cowl anti ice fails or 14th stage bleed air pressure increase, this valve prevents overpressure

Question 36

do you have any message on EICAS? for overpressure valve

Answer 36

no only during external inspection

Question 37

Question 38

Question 39

Question 40

What are the modes of air data probes and sensors?

Answer 40

Ground and flight

Question 41

For the air data probes and sensors what is the difference between ground and flight?

Answer 41

Ground mode; can be off, low heat or high heat | Flight mode all probes and sensors are heated regardless of switch position

Question 42

What are the heated probes and sensors?

Answer 42

Left and right Pitot static probes stand by Pitot probe left and right AOA vanes total air temperature probe

Question 43

Explain windshield and window anti ice system

Answer 43

low heat level to prevent thermal shock | High heat level windshields are maintained at high heat while side windows remain at low heat

Question 44

What is the maximum speed for wiper operation?

Answer 44

220

Question 45

Answer 45

Question 46

Answer 46

Question 47

Answer 47

Question 48

Question 3: How do ice detector probes operate?

Answer 48

Answer: Ice detector probes vibrate at high frequency.

Question 49

Question 4: What action does the microprocessor take when the aircraft encounters icing conditions?

Answer 49

Answer: The microprocessor de-ices the probe electrically for 5 seconds during each sixty-second period.

Question 50

Question 5: What role does the microprocessor play in the anti-icing system?

Answer 50

Answer: The microprocessor signals the data concentrator.

Question 51

Question 6: How long does the microprocessor typically de-ice the probe for during each de-icing cycle in icing conditions?

Answer 51

Answer: 5 seconds.

Question 52

Question 7: What is the frequency at which the microprocessor de-ices the probe during icing conditions?

Answer 52

Answer: Once every sixty-second period.

Question 53

Question 7: What is the frequency at which the microprocessor de-ices the probe during icing conditions?

Answer 53

Answer: Once every sixty-second period.

Question 54

Question 8: What is the purpose of vibrating the ice detector probes at high frequency? .

Answer 54

Answer: To prevent the formation of ice on the probes

Question 55

Question 56

Question 1: How are wing anti-icing valves normally positioned?

Answer 56

Answer 1: Wing anti-icing valves are spring-loaded to the closed position.

Question 57

Question 2: What events can trigger the closure of wing anti-icing valves?

Answer 57

Answer 2: Loss of 14th-stage pressure or loss of electrical power causes the valve to close.

Question 58

Question 3: How is the 14th-stage isolation valve operated? Answer 3: The 14th-stage isolation valve is pneumatically operated.

Question 59

Question 4: What controls the operation of the 14th-stage isolation valve? .

Answer 59

Answer 4: The 14th-stage isolation valve is electrically controlled

Question 60

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Question 65