Airframe Ice + Rain Control Flashcards

1
Q

What controls the temperature in a thermal anti-icing system?

A

Hot and cold air are mixed.

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2
Q

What are the sources of heat for thermal anti-icing systems?

A

Bleed air from the compressor.

Engine exhaust heat exchangers.

Combustion heaters.

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3
Q

What prevents overheating of the leading edges of a thermal anti-ice system operated by engine bleed air?

A

Overheat sensors signal the anti-icing valves to close and shut off the hot air.

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4
Q

What happens to the hot air used by a thermal anti-ice system after it has heated the surface?

A

The air is dumped overboard.

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5
Q

Why is it necessary to provide overheat protection for an anti-icing system that uses turbine engine bleed air?

A

The air is hot enough to cause damage to the aircraft structure.

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6
Q

What are the effects of arcing on an electrically heated windshield?

A

Localized overheating. Damage to the windshield.

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7
Q

Can the operation of an electrically heated pitot tube be checked with the aircraft’s ammeter, and if so, how?

A

Yes.
Turn the Pitot heater on, and observe the deflection of the ammeter needle.

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8
Q

Describe several potential problems associated with electrically heated windshield:

A

Arcing.
Delamination.
Scratches.
Discoloration.

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9
Q

Why do some pneumatic deicer boot systems have an electrically operated timer?

A

To automatically cycle the boots.

Provide the proper rest time.

Then recycle the boots.

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10
Q

What are the two common methods of inflating pneumatic deicer boots?

A

Bleed air from a turbine engine.

Exhaust from an engine driven vacuum pump.

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11
Q

What procedure is used to hold deicer boots flat with an airfoil surface during flight?

A

Suction is applied to the boots.

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12
Q

Why do some deicer boot systems incorporate an oil separator?

A

If a wet pump system is used, the oil must be removed before it reaches the boot because oil damages the rubber.

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13
Q

What methods are used to attach a deicer boot to the leading edges of the wing and tail surfaces?

A

Adhesives.
Ferring strips and screws.
A combination of both.

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14
Q

What important steps should be taken prior to making a cold patch repair to a deicer boot?

A

Consult the manufacturer’s service manual and follow the repair instructions explicitly.

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15
Q

Describe the methods commonly used to remove rain from a windshield:

A

Windshield wipers.
A blast of air.
Chemical rain repellent.

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16
Q

What power sources are used to operate windshield wipers?

A

Electricity.
Hydraulic pressure.

17
Q

Name two problems associated with in-flight operation of aircraft windshield wipers:

A

Insufficient blade pressure caused by aerodynamic forces.

Failure to oscillate fast enough.

18
Q

Describe the operation of a pneumatic rain removal system:

A

A high velocity air blast prevents the rain from reaching the surface of the windshield.

19
Q

What are the effects of spraying rain repellent on a dry windshield?

A

It smears and streaks, which reduces visibility.

It is hard to remove when dry.

20
Q

Where would you find information on the acceptable limits of windshield delamination?

A

In reference material provided by the manufacturer.