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Cat B- Mod 11 Aircraft Systems > 11.12 Ice and Rain Protection > Flashcards

11.12 Ice and Rain Protection Flashcards

1
Q

What are the three most common types of ice encountered in flight?

A

Clear
Rime
Mixed

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2
Q

What is clear ice also known as?

A

Glaze ice

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3
Q

How does clear ice form?

A

Formed by larger supercooled water droplets, of which only a small portion freezes immediately.

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4
Q

How is rime ice formed?

A

Small, supercooled water droplets, such as those in stratified clouds or light drizzle, freeze rapidly on contact with a sub-zero surface.

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5
Q

What is mixed ice?

A

Mix of rime and clear.

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6
Q

What are wing inspection lights for?

A

Detection of ice.

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7
Q

What is a hot rod detector?

A

Similar to the ice rod on the front of the windscreen, it is found outside a flight deck window, is heated and lit.

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8
Q

Where is the rotary ice detector mounted?

A

Forward fuse

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9
Q

How does a rotary ice detector work?

A

When ice builds up it takes more rotational torque to shave off the ice with the blade from the rotary part.

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10
Q

How does a vibrating ice probe detect ice?

A

It vibrates at a set frequency, as ice builds up the frequency decreases.

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11
Q

How does a sangamo weston ice detector work?

A

It detects freezing temps and moisture separately to decide if there is a chance of ice build up.

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12
Q

What three key parts does a sangamo weston ice detector have?

A

Moisture detector controller
Moisture Sensing Head
Thermal switch

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13
Q

How does a Beta Particle Ice Detection Probe (Sunstrand System) work?

A

Beta particles are released, and reach a sensor, ice would reduce the amount of particles making it too the sensor.

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14
Q

What is thermal pneumatic anti icing used for?

A

Leading edges

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15
Q

In the wing anti icing system when does the temperature of the bleed air trigger the overheat warning?

A

100 °C outboard or 175 °C inboard

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16
Q

How can a surface be anti iced?

A

Keep it dry
Keep it hot

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17
Q

What does the WAI valve do?

A

Controls the flow of bleed air from the pneumatic system to the WAI ducts.

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18
Q

In auto how long will the WAI valves stay open?

A

3 Mins

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19
Q

If an aircraft has EAI (engine anti ice) is it activated before or after WAI?

A

Beforee

20
Q

What is weeping wing?

A

Chemical protection of the wing and stabiliser

21
Q

What is ice protection based upon?

A

Freezing point depressant concept

22
Q

What is the freezing point depressant concept?

A

An antifreeze solution is pumped from a reservoir through a mesh screen, embedded in the LEs of the wings and stabilisers.

23
Q

What does the TKS (weeping wing) system contain?

A

Laser drilled titanium panels with over 800 tiny holes.

24
Q

How long does the capacity of the TKS system reservoir allow?

A

1-2 hours of operation

25
Q

What are the most common component used for de icing wings on small aircraft?

A

Pneumatic boots

26
Q

How long are LE boots inflated for?

A

6-8 seconds

27
Q

When the de-icing boots are not in use what happens to them?

A

The vacuum suction keeps them tight to the aircraft.

28
Q

What PSI does the ice boots deflate at?

A

17 psi

29
Q

How can the life of the rubber boots be extended?

A

By storing the when they are not needed.

30
Q

How is grease and oil removed from the rubber boots?

A

Naphtha

31
Q

Where can chemical de-ice for windshields be found?

A

Small aircraft

32
Q

What happens in electrical propellor de-icing if the heat is enough to melt the ice but not evaporate the water?

A

Runback occurs, causing the melted ice to freeze on other parts of the blade.

32
Q

How is chemical de icing delivered to the propellors?

A

Slinger ring

33
Q

What systems do aircraft use to control rain on the windshield?

A

Chemical
Pneumatic
Coatings

34
Q

What is the rainboe system?

A

Rain repellent system used that has CFC 113

35
Q

Why is rain repellent now banned?

A

Because it contains CFC which is ozone depleting.

36
Q

When and why should rain repellent systems not be used?

A

Dry conditions, as heavy undiluted repellent restricts window visibility.

37
Q

Which treatment is a popular repellent?

A

Hydrophobic coating

38
Q

What should you not do to hydrophobic coatings?

A

Apply wax or polish

39
Q

What is the life of hydrophobic coating effected by?

A

Wiper blade tension

40
Q

What does each windshield wiper system consist of?

A

Wiper, wiper arm and wiper motor.

41
Q

What is the wiper blade tension?

A

Then angle at which the blade sweeps across the windshield.

42
Q

What does the off/park mode do to the wipers?

A

Sets it to the park/stowed mode.

43
Q

How many cycles are there in low mode for the wipers?

A

160 cycles per minute.

44
Q

How many cycles are there in high mode for the wipers?

A

250 cycles per minute

45
Q
A

Cat B- Mod 11 Aircraft Systems (28 decks)

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