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Airframes > Ice Protection > Flashcards

Ice Protection Flashcards

1
Q

How do aircraft get ice?

A

Aircraft surface disturbs super cooled droplets turning into ice

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2
Q

What are the three types of ice?

A

Rime Ice
Clear/Glaze Ice
Mixed Ice

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3
Q

This type of ice is MILKY white and rough, made of SMALL water droplets?

A

Rime Ice

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4
Q

This type of ice is CLEAR and made of LARGE droplets?

A

Clear Ice

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5
Q

What are the effects of Icing?

A 
Loss of lift, comms. thrust
more weight
flutter
damage to turbines
piston carb icing
flight control reduced
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6
Q

What are 2 types of ice detection?

A

Visual and Electrical detection

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7
Q

What are the components of electronic detection?

A

strut,
probe into the wind, electronic microprocessor
heating element

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8
Q

How does electronic ice detection work?

A

microprocessor causes probe to vibrate at high frequency

more ice = less frequency = turn on warning light

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9
Q

What are the types of Anti-Ice systems?

A

Thermal
electric
Chemical

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10
Q

How does the thermal ice system work?

A

uses PNEUMATIC air flowing though PERFORATED AIR DUCT (piccolo) that prevent formation of ice

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11
Q

How is air supplied for piston and turbine engine for thermal ice system?

A

Piston = Combustion heaters

Turbines = Bleed air

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12
Q

How do electric anti-ice system work?

A

HEATING ELEMENTS EMBEDDED IN COMPONENT OR WRAP TO INCREASE SURFACE TEMPERATURE PREVENTING ICE FORMA

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13
Q

Electric anti-ice is limited to what and why?

A

small components because of high amp draw

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14
Q

What type of heating elements are used for Electric anti-ice?

A

resistive filament

transparent film

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15
Q

What is Electric anti-ice used for?

A

heat probes, wind screens, drains, plumbing

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16
Q

For electric anti-ice what is used to monitor and control heater temp?

A

temp. sensitive resistors and thermal switches

17
Q

How is electricity transferred to the prop?

A

slip ring
brush block
switching/harness

18
Q

How does chemical anti-ice work?

A

uses a mixture to decrease freezing point + decrease surface adhesion

19
Q

What chemicals are used?

A

isopropyl alcohol

ethylene glycol

20
Q

Where is the chemical anti-ice used?

A

prop
leading edge
windscreen

21
Q

How does Electrical Prop De-Ice system work?

A

heating element in rubberized cloth at leading edge melts the boundary layer and centrifugal force throws it off

22
Q

What are the 2 tpes of Pneumatic de-ice systems?

A

Boots and vaccuum

Airframes (19 decks)

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