Airframe Chapter 13 Flashcards

1
Q

What controls the temperature in a thermal anti icing system?

A

Heat 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 section of a turbine engine, engine exhaust heat exchangers and combustion heaters.

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3
Q

What prevents overheating of the leading edge 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 anti icing systems that use turbines 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 and 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 windshields.

A

Arcing, delamination, scratches, and discoloration.

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9
Q

Why do some pneumatic de-icer boot systems have an electrically operated timer?

A

To automatically cycle the boots, provide the proper rest time, and then recycle the boots.

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10
Q

What are the two common methods of inflating pneumatic de-icer boots?

A

Bleed air from a turbine engine or exhaust from an engine driven vacuum pump.

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11
Q

What procedure is used to hold deicer boots flat with the 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 boots because oil damages the rubber.

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13
Q

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

A

Adhesives, fairing strips and screws, or a combination of both.

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14
Q

What important step 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, or chemical rain repellant.

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16
Q

What power sources are used to operate windshield wipers?

A

Electrical or hydraulic pressure.

17
Q

Name the two problems associated with in flight operation of aircraft windshield wipers.

A

Insufficient blade pressure caused by aerodynamic forces and 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 repellant on a dry windshield?

A

It smears and streaks, which reduces visibility, and it is hard to remove when dry.

20
Q

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

A

In the reference material provided by the manufacturer.