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Captain > Ice and Rain Protection Systems > Flashcards

Ice and Rain Protection Systems Flashcards

1
Q

what anti ice provided?

A

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

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2
Q

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

A

14th stage bleed air

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3
Q

Where do electric anti icing provide?

A

Windshields, windows, air data probes, sensors

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4
Q

where are the controls and indications of anti ice?

A

Anti ice panel and wiper panel

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5
Q

What is the ice detection system?

A

Monitors and alerts pilots for icing

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6
Q

Where are the ice detector probes?

A

On each side of the airplane

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7
Q

When ice is detected what is generated?

A

Ice caution or ice advisory

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8
Q

When do we have ice caution message?

A

Icing conditions detected

Wing and cowl anti ice is selected off

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9
Q

When does the ice advisory message is generated?

A

Icing conditions detected

Wing and cowl anti is selected on

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10
Q

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

A

“ICE” caution and advisory

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11
Q
A
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12
Q

What is the purpose of 14th stage shutoff valves?

A

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

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13
Q

How do you control the 14th stage shutoff valve?

A

On the bleed air panel

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14
Q

what is the purpose of wing and anti ice valve?

A

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

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15
Q

What is the purpose of 14 stage isolation valve?

A

Allow both wings to be anti iced using one bleed source

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16
Q

How the wing and cowl anti icing valves are identified?

A

Color cyan and label CMD

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17
Q

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

A

Commanded position. Not actual

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18
Q

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

A

One wing anti-ice valve

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19
Q

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

A
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20
Q
A
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21
Q
A
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22
Q

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

A

Normal mode and standby mode

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23
Q

What is normal mode?

A

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

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24
Q

what is standby mode?

A

Used when directed by QRH

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

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25
Q
A
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26
Q

Where can you see wing-ice EICAS indications?

A

Primary, status and anti ice synoptic page

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27
Q

Wing Anti Ice primary page

A

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

28
Q

What is the purpose of amber color on the arc?

A

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

29
Q

Wing Anti Ice status page

A

Appropriate advisory messages

30
Q
A
31
Q

What is thrust reverser override?

A

During a rejected takeoff or landing 14th stage bleed air is redirected to thrust reverser

Anti Ice will reactivate once trust verses are stowed

32
Q

What is bleed air leak detection?

A

Single loop configuration with heat sensing loops detect air leak

33
Q
A
34
Q

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

A

14th bleed air

failed open to allow continuous air

35
Q

What is the purpose of pressure relief valve?

A

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

36
Q

do you have any message on EICAS? for overpressure valve

A

no only during external inspection

37
Q
A
38
Q
A
39
Q
A
40
Q

What are the modes of air data probes and sensors?

A

Ground and flight

41
Q

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

A

Ground mode; can be off, low heat or high heat

Flight mode all probes and sensors are heated regardless of switch position

42
Q

What are the heated probes and sensors?

A

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

43
Q

Explain windshield and window anti ice system

A

low heat level to prevent thermal shock

High heat level windshields are maintained at high heat while side windows remain at low heat

44
Q

What is the maximum speed for wiper operation?

A

220

45
Q
A
46
Q
A
47
Q
A
48
Q

Question 3: How do ice detector probes operate?

A

Answer: Ice detector probes vibrate at high frequency.

49
Q

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

A

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

50
Q

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

A

Answer: The microprocessor signals the data concentrator.

51
Q

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

A

Answer: 5 seconds.

52
Q

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

A

Answer: Once every sixty-second period.

53
Q

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

A

Answer: Once every sixty-second period.

54
Q

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

A

Answer: To prevent the formation of ice on the probes

55
Q
A
56
Q

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

A

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

57
Q

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

A

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

58
Q

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

A
59
Q

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

A

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

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61
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62
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63
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64
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65
Q
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Captain (3 decks)

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