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ATR > Ice & Rain > Flashcards

Ice & Rain Flashcards

1
Q

What ice protection does pneumatic air provide?

A
  • wing leading edges
  • horizontal stabiliser leading edges
  • engine air intakes
  • gas paths
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2
Q

Where are the chordwise boots used?

A

Leading edges and gas paths

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3
Q

Where are the annular boots used?

A

Engine intakes

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4
Q

What happens when the boot is deflated?

A

It is held to the structure by Venturi effect

The Venturi effect is created by the bleed air

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5
Q

What controls the inflation of the boots?

A

The associated distribution valve

There are seven distribution valves

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6
Q

What uses electrical power for deicing?

A
  • prop blades
  • windshields
  • probes
  • static ports
  • flight control horns
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7
Q

Where is the ice detector located?

A

Rosemont Ice detector probe - Under the left wing

Provides crew with visual and aural alert when ice is accreting on the probe

Powered by AC Wild bus 2

As ice accumulate the vibration freq changes

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8
Q

Where is the Ice Evidence Probe located?

A

Located outside and below the Captains left side window

Visible to both pilots and provides a visual indication of ice accretion

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9
Q

When will the amber icing light illuminate?

A

When 0.5 mm of ice has accumulated on the probe

Probe will initiate a heat cycle to remove accretion and start again

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10
Q

What does it mean if the ICING light extinguishes on its own?

A

Indicates that ice is no longer accumulating

Does not indicate that airframe is clear of residual ice

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11
Q

What is the delivery pressure of the de-ice valves?

A

20.3 psi

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12
Q

What distributes air to the wing and horizontal stabiliser distribution valves?

A

The common manifold

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13
Q

What controls the boots?

A

The associated MFC

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14
Q

How long is the boots inflation cycle?

A

If SAT is greater than -20 cycle is set at 60 secs with 20 sec dwell

If SAT is less than -20 cycle is set at 180 secs with 140 sec dwell

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15
Q

What happens if you press in the DE-ICE MODE SEL pb?

A

SLOW caption is the pb is illuminated and cycle is forced to 180 secs

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16
Q

What is electrically anti-iced?

A
  • props
  • flight control horns
  • probes
  • windshields
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17
Q

What anti-ices the flight control horns?

A

AC Wild electrical power

115 VAC

Horn anti-icing is inhibited on the ground

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18
Q

Why does the ICING AOA illuminate green when anti-icing is on?

A

The AOA threshold is lowered by selection of anti-ice

Serves as a reminder to the crew to set speed bugs and observe minimum icing speeds

Light can only be extinguished manually by pressing the pb after both horn anti-icing buttons have been selected OFF

19
Q

What powers the propeller heat?

A

AC Wild bus

20
Q

When is the low power propeller cycle used?

A

Between 0 and 10 degrees celcius

Heating time is 10 seconds

Normal cycle when the pb is in the out position

21
Q

What is the high power propeller cycle?

A

Heating time is 20 secs and there is no pause between cycles

22
Q

Why are the two front windshields heated?

A

To prevent anti-icing and defogging

The side windows are heated to prevent fogging only

23
Q

What powers the windshield heat?

A

The associated AC Wild bus

24
Q

What does the temperature controller maintain the windshields at?

A

Outside ply maintained at 2 degrees

Maintains inner ply above 21 degrees to prevent fogging

25
Q

What heats the side windows?

A

Heated by the 28 VDC bus

Temp regulated to maintain the inner temp over 20 degrees

26
Q

Why is the aft portion of the side windows not heated?

A

The heating element is designed to warm the whole plane

Ice build up aft of the heated portion is usually an indication of severe icing and/or freezing rain

27
Q

What is the probe heat source?

A

AC power used to heat:
- pitot probes
- alpha probes
- TAT probe

28
Q

How is static port heat controlled?

A

Static port heat controlled by the associated probe heat pb

29
Q

What happens to TAT probe heat on the ground?

A

Automatically inhibited and the condition of the probe is not monitored

30
Q

What is the windshield wiper speed limit?

A

160 kt

31
Q

When does the ICING light illuminate?

A

When ice accretion is detected

It will be steady if both horn anti-icing and airframe de-icing are selected on

It will flash if either is off

32
Q

What is the icing test?

A

Test button pressed and held for 3 seconds

During the test the ICING amber light flashes and a single chime will sound

FAULT will illuminate if a fault is detected during the test

33
Q

When will the blue DEICING light flash?

A

If the de-icing system is still on 5 minutes after the last detection of ice accretion

34
Q

When will the FAULT light on the airframe air bleed pb light?

A

If the pressure downstream of the de-ice valves is below 14 psi for more than 10 secs or when air temp of the bleed air exceeds 230 degrees

35
Q

When will the airframe pb FAULT light illuminate?

A

When a distribution valve is commanded closed but bleed air pressure still exists downstream or if a valve is commanded open but no pressure is sensed

36
Q

When does the MODE SEL AUTO FAULT light illuminate?

A
  • failure of the 1B or 2B MFC
  • ADC failure
37
Q

What is the de-icing emergency mode?

A
  • timing cycle of 60 secs
  • OVRD caption illuminates white
  • all de-icing lights extinguish

Used when a fault light illuminates

38
Q

When will the FAULT light in the DEICING OVERRIDE pb illuminate?

A

If there is a failure in both MFC modules

39
Q

What is level 1 anti-icing?

A

Must be selected on before each flight

Probe and forward windshield anti-ice are turned on

40
Q

What is anti-icing level 1.5?

A

Take off in ground icing but flight into non-icing conditions

Continuous relight selected

Prop anti-ice selected on

41
Q

What is anti-icing level 2?

A

Operating or taking off in icing conditions

  • prop anti-ice
  • horn anti-ice
  • side window anti-ice
  • engine de-ice

Continuous relight selected

42
Q

What is anti-ice level 3?

A

Flight where ice is accreting

  • prop heat
  • horns and side window anti-ice
  • engine de-icing
  • airframe de-icing

Continuous relight selected

43
Q

With the MOD SEL pb in AUTO, what system determines the de-icing cycle?

A

The MFCs and the ADCs

ATR (24 decks)

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