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CRJ 900 > Ice And Rain > Flashcards

Ice And Rain Flashcards

1
Q

What controls the wing anti-ice system?

A

Anti-ice leak detection controller (AILC)

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2
Q

How many common bleed manifolds are there?

A

Just one

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3
Q

When do Icing conditions exist on the ground?

A

When OAT is less than 10ºC and either visible moisture is present in any form or the operating areas (ramps, taxiways, runways, etc.) are contaminated.

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4
Q

What is “visible moisture”

A

Fog (with visibility of 1sm or less), rain, snow, sleet, or ice crystals.

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5
Q

What are icing conditions in flight?

A

Total Air Temperature (TAT) is 10ºC or less an visible moisture is present, except when the Static Air Temperature (SAT) is -40ºC or below.

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6
Q

How many ice detectors does the aircraft have?

A

2

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7
Q

How do the ice detectors detect ice?

A

The ice detectors vibrate at a particular high frequency. When ice accumulates on them it changes the vibrating frequency which can be detected by the aircraft.

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8
Q

How does the ice detector know if its left icing conditions or not?

A

When in icing conditions, the probe de-ices electrically for five seconds during each 60 second period. If no new ice accrues then the aircraft knows it’s left icing conditions. This could mean it takes up to 60 seconds after leaving icing conditions for the aircraft to know it.

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9
Q

How does the aircraft let us know that we’re in icing conditions?

A

There will be either a green or amber “ICE” indication at the top of the EICAS Primary page, depending on the aircraft configuration.

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10
Q

When will an amber ICE message be displayed on the top of the Primary page?

A

When either ICE detector detects ice, and if either the wing or cowl anti-ice is NOT selected on. It will also be amber if the wing and cowl anti-ice are both selected on, but the wing leading edge is 39ºC or less.

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11
Q

When will a green ICE message be displayed at the top of the Primary page?

A

When either Ice detector detects ice, both wing and cowl anti-ice are selected on, and the wing leading edge is greater than 39ºC

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12
Q

What items are anti-iced/de-iced using bleed air?

A

Wing leading edges and engine intake cowls

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13
Q

Which items are anti-iced/de-iced electrically?

A

Windshields, side windows, pitot/static probes, alternate static ports, AOA sensors, TAT probe, ice detectors, T2 probe.

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14
Q

What part of the wings are heated using bleed air?

A

Inboard (behind the slats) leading edges, and slats

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15
Q

What determines the determines the wing anti-ice temperature schedule?

A

The position of the slats. When the slats are deployed a bigger gap is required to be heated requiring higher temperatures.

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16
Q

What does the wing cross bleed valve do?

A

In the open position it allows air from from the left/right engine to heat the leading edge of the opposite side wing (in addition to the same side wing).

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17
Q

What is the tube in the leading edge slat that disperses heat bleed air called?

A

The piccolo tube

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18
Q

How are the piccolo tubes from different slat segments connected to each other?

A

Via flexible joints

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19
Q

In which slat is the piccolo tube the biggest? Smallest?

A

Slat 1 (the most inboard slat) has the biggest piccolo tube, and they get smaller as they go towards to tip of the wing. This slat 3 has the smallest piccolo tube/

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20
Q

Which duct supplies heated bleed air the engine intake cowl?

A

The double-walled cowl anti-ice duct. The inner duct supplies heated air. The air between the walls is heated by the inner tube.

21
Q

How would a leak in the cowl anti-ice be detected by the aircraft? How would it be displayed to the pilots?

A

There’s an independent pressure transducer on the outer wall of the double-walled cowl anti-ice duct. If the pressure increases in the space between the walls, the pressure transducer will sense it, indicating a leak in the duct. The pilots will be advised via a “L (R) COWL A/I DUCT” warning message on the primary page.

22
Q

What does a red “WING OVHT” warning on the EICAS mean?

A

The temperature sensor in the wing detects an overheat condition

23
Q

What does a red “ANTI-ICE DUCT” on the EICAS mean?

A

Bleed air leak is detected in the center fuselage or wing ducting

24
Q

What does a yellow “L(R) WING A/I” caution message on the EICAS mean?

A

Low anti-icing pressure and inadequate temperature are found

25
Q

Is the Isolation valve considered an anti-icing component?

A

No

26
Q

What does the cross bleed switch do when set to “FROM RIGHT” or “FROM LEFT”?

A

It closes the opposite side anti-ice valve, and opens the crossbleed valve, allowing for single source anti-icing.

27
Q

How many AILC channels are there?

A
  1. Left A, left B, right A, and right B.
28
Q

What does the AILC do if a wing overheat is detected?

A

Automatically closes the affected wing anti-ice valve.

29
Q

What monitors and controls the probe heaters?

A

The air data sensor heater controllers (ADSHC’s)

30
Q

What’s an ADSHC?

A

Air data sensor heater controller

31
Q

How many ADSHC’s are there?

A

3

32
Q

Which probes are heated on the ground, using external power, with the probe heat switch in the off position?

A

None.

33
Q

Which probes are heated on the ground, with external power, with the probe heat switch on?

A

The static ports, the AOA sensors, and the pitot heads (at half heat)

34
Q

Which probes are heated on the ground, using generator power, with the probe heat switch off?

A

Pitot heads only (1/2 power)

35
Q

Which probes are heated on the ground, using generator power, with the probe heat switch on?

A

Static ports, AOA sensors, TAT probe, and pitot heads (1/2 power)

36
Q

Which probes are heated in flight, regardless of probe heat switch position?

A

Pitot heads, pitot bases, static ports, TAT probe, and AOA sensors

37
Q

Which probe will never be heated on the ground regardless of power source or probe heat switch position?

A

The pitot bases

38
Q

When must the windshield heat be turned off?

A

OAT greater than 30ºC

39
Q

What happens when the windshield anti-ice/fog is set to LOW?

A

All 4 windows will be heated to 24ºC

40
Q

What happens when the windshield anti-ice/fog is set to high?

A

Windshield is heated to 41ºC and side windows are heated to 24ºC

41
Q

What’s the operating limit of the windshield wipers?

A

250kias

42
Q

How many windshield wiper switches are there? What determines the windshield wiper speed?

A

There are two switches, one for the Captain and one for the FO. The last selected position by either the FO or Captain will be active, regardless of the switch position on the opposite side.

43
Q

What are the windshield wiper switch settings?

A

Off, intermittent, low, and high

44
Q

What happens when the windshield wipers are set to intermittent?

A

There’s a 5 seconds delays between wipes

45
Q

What happens when the wing anti-ice switch is set to on?

A

The AILC modulates the wing anti-ice valves and white N2 arcs appear. You should attempt to keep N2 above that arc to supply enough bleed air to the wings.

46
Q

What tests the wing anti-icing system?

A

The AILC continuously tests the wing anti-ice system.

47
Q

What’s an AILC?

A

Anti-ice leak detection controller

48
Q

What does the DET TEST switchlight on the anti-ice overhead panel do?

A

Tests both ICE detection and Air Data Sensor Heater Controller (ADSHC) systems. If the test passes, a “ADS HEAT TEST OK” advisory message on the status page

CRJ 900 (23 decks)

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