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Part 121 - CRJ 701/900 > Ice and Rain Protection > Flashcards

Ice and Rain Protection Flashcards

1
Q

What are the two different sources of heating for ice protection?

A
  1. Bleed air 2. Electrical heating
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2
Q

What is Bleed air used to heat?

A
  1. Wing leading edges 2. Engine intake cowls
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3
Q

What does the electrical system heat?

A
  1. Flight deck windshields 2. Flight deck side windows 3. Air data probs 4. Sensors
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4
Q

How is the Anti-Ice system monitored?

A
  1. Synoptic page 2. EICAS messages 3. Switch lights
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5
Q

What is the ice detection system made of and where is it powered from?

A

Made of 2 assemblies consisting of a detector unit and probes and it’s powered by AC.

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6
Q

If Ice is detected, by the ice detection system, what will happen?

A

Wing and Cowl On: ICE advisory Wing and Cowl OFF: ICE caution And temperature will be sent to the ice detection probe

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7
Q

When is the ICE caution message removed

A

When ice is no longer detected.

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8
Q

If the Ice detection system fails, what will happen?

A

If 1 fails: “ICE DET 1/2” displays in white on synoptic page. If both fail, it will display in Amber on synoptic page

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9
Q

How do we test the Ice detector system and what do we look for during the test?

A

Holding the test Switchlight for 5 seconds. 5 things: 1. Ice Switchlight illuminates 2. Master caution flashes 3. ICE caution on EICAS primary 4. ADS HEAT TEST OK on advisory It also tests the probe heater

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10
Q

How is the engine bleed air routed through the wings?

A

Piccolo tubes

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11
Q

When the WING switch is turned on on the ANTI-ICE panel, what happens?

A

Enables the anti-ice and leak detection controller to automatically open or close anti-ice valves as necessary to keep ice from forming on wings.

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12
Q

AILC

A

Anti-ice and leak detection controller

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13
Q

How many channels does the AILC have and what is it’s purpose?

A

2 channels in order to move the lest and right anti-ice valve independently

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14
Q

How many temperature probes are on the wing leading edges?

A

4 in total, 2 per side, 1 outboard, 1 inboard.

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15
Q

What is the cross bleed valve and it’s purpose?

A

It’s used if one side of the Anti-ice system fails. Allows X-Bleed valve to open and provide bleed air from on side to heat both wings.

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16
Q

If “FROM LEFT” is selected, what will happen?

A

The X-BLEED VALVE will open and the Right Wing Anti-Ice Valve will close to prevent back pressure from the left to the right engine.

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17
Q

“L/R WING A/I” EICAS caution displays if…

A
  1. One of the wing anti-ice valves fail or… 2. a low temperature has been detected.
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18
Q

What does the “WING A/I ON” advisory mean?

A

The wing anti ice system is on and normal

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19
Q

What will display the position of the anti-ice bleed valves?

A

The ANTI-ICE synoptic page

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20
Q

What does “WING A/I SNSR” on the synoptic page mean?

A

A failure of both Channels of the left or right outboard wing temperature sensor occurs with wing A/I selected on

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21
Q

“WING OVHT” means what?

A

Overheating has been detected on a wing.

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22
Q

Describe the the purpose of the Cowl ANTI-ICE system?

A

It prevents ice formation on the leading edges of the engine nacelles by ducting bleed air from engines, running it through insulated ducting and air mixing tubes which carry the bleed air to the inner wall of the engine cowl

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23
Q

How does the COWL anti ice system detect a fault?

A

If the inner wall of the engine cowl ruptures, a bleed leak detector transducer located in outer wall senses the leak.

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24
Q

How will you know if there is a rupture in the inner wall of the engine cowl anti-ice system?

A

“COWL A/I DUCT” warning on EICAS and Aural.

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25
Q

How is engine bleed air routed to the engine cowls?

A

Through the L/R cowl anti-ice shutoff valves.

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26
Q

How are the L/R cowl anti-ice shutoff valves controlled and activated?

A

Controlled electronically Activated pneumatically

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27
Q

what does “COWL A/I” advisory mean?

A

The LH and RH Cowl Anti-Ice valves are open

28
Q

What does L COWL A/I OPEN caution mean?

A

The Left cowl anti-ice valve failed to close.

29
Q

When will L/R COWL A/I DUCT caution be displayed?

A

When cowl duct pressure is less than 3.12 psi or greater than 53.1 psi with the battery bus powered.

30
Q

Where is the T2 probe? What is it used for?

A

On the engine cowling before the fan. It monitors temperature and sends it to FADEC to set respective engine parameters.

31
Q

FADEC

A

Full authority digital engine control

32
Q

Describe the anti-ice system for the T2 probes.

A

T2 probes have built in heating elements that are automatically controlled by FADEC.

33
Q

How do we test the T2 probe heating functions?

A

We don’t it’s done automatically by FADEC after LANDING and SHUTDOWN on the ground.

34
Q

After right engine shutdown, what should we do regarding the T2 Sensor Probe test?

A

Maintain power on the aircraft for a minimum of two minutes to allow FADEC to complete the test.

35
Q

If the T2 probe fails it’s test, how will we know?

A

R/L ENG TAT HEAT caution will be displayed

36
Q

What probes does the ADS Anti-ice system regulate?

A

L/R Pitot L/R Static L/R AOA STBY Pitot TAT Probe

37
Q

How many controllers make up the ADS Anti-Ice system and which one controls what?

A

3 controllers: 1st: L Pitot, Static and AOA 2nd: R Pitot, Static and AOA 3rd: Sby Pitot, TAT

38
Q

What are the different modes of the ADS anti-ice system?

A

GROUND and FLIGHT

39
Q

What are different running options for the GROUND mode of the ADS anti-ice system and the differences between each?

A

AUTOMATIC: Probes switches in OFF, all pitot probes heated 1/2 power, no AOA or static. MANUAL: Probes switches in ON, everything in automatic with AOA and Static ports heated.

40
Q

In flight mode of the ADS Anti-ice system what will happen if the probes are in the OFF position?

A

Controllers will automatically supply full power to all of the probes and sensors…. THIS HAPPENS REGARDLESS OF SWITCH POSITION.

41
Q

Describe the Windshield and Side-window heating system.

A

All flight deck windows are Heated electronically, contain their own controller to control temperature heat (4 in total) and contains 3 sensors each: 1 normal sensor 1 overheat sensor 1 standby sensor as a backup for either The switches in the flight deck can be controlled to apply LOW or HI heat.

42
Q

When is the LOW position used for the windshield heat?

A

For de-misting or de-fogging

43
Q

When is the HIGH position used for windshield heat?

A

For deicing the MAIN windows only, side windows remain on low regardless of switch position

44
Q

If the WSHLD switches are selected off, what will happen regarding EICAS messages?

A

L/R WINDOW HEAT and L/R WINDSHIELD HEAT messages will display

45
Q

Max speed for windshield wiper?

A

220

46
Q

If one windshield wiper selector fails, what will happen?

A

Both wipers we be controlled by the other selector.

47
Q

If the windshield wiper selectors and each set to a different position, what will happen?

A

The last selection will take precedence.

48
Q

If the T2 heater test fails on both FADEC channels, what will happen?

A

The L/R ENG TAT HEAT EICAS caution message displays The FADEC will not attempt to energize the respective T2 heater

49
Q

What needs to happen for the ADS Anti-Ice system to go into the ground automatic mode?

A

At least 1 generator on.

50
Q

What does green ICE mean?

A

In icing conditions, stuff turned on

51
Q

What does amber ICE message mean?

A

In ice with stuff not turned on

52
Q

How many ice detectors are there and how do they work?

A

Two ice detectors on the sides of the nose, they work by vibrating at high frequencies, ice accumulation will drop the frequency and that drop in frequency triggers the ICE messages.

53
Q

The Bleed Air valves displayed on the ECS and A/ICE synoptic pages ______.

A

Indicate actual position of the valves.

54
Q

What is the inboard temperature sensor used for?

A

Temperature regulation and overheat monitoring.

55
Q

What is the outboard temperature sensor responsible for?

A

Giving the wing A/I caution message AND anti-ice duct warning message.

56
Q

What is the sequence for turning on Wing and Cowl Anti-ice?

A

1st turn on wing 2nd turn on cowl

57
Q

Above 230 knots, when should Wing Anti-Icing be on?

A

When you have an ICE message.

58
Q

How many air data sensor heat controllers?

A

3

59
Q

What are the only probes that are pilot selectable on the ground?

A

AOA vanes and S1 and S2 static ports

60
Q

Is S3 heated on the ground automatically?

A

Yes, S1 and 2 are not.

61
Q

When do we switch the window heat off?

A

Temperature is above 30 degrees C. Back on after takeoff

62
Q

When is the only time you would go to high on the windshield heat?

A

When you’re actually accumulating ice.

63
Q

Maximum speed with the windshield wiper stuck.

A

250

64
Q

The ice detector probes vibrate at a very high frequency, they are not heated until __________.

A

Icing is encountered and the vibration rate decreases.

65
Q

With the windshield heat switch in the high position, the 2 windshields are heated to ______ and the 2 side windows are heated to ________.

A

Night & Low

Part 121 - CRJ 701/900 (25 decks)

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