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Flashcards in Ice And Rain Deck (26):
1

What are the source of heat for thermal anti-icing systems

Bleed air, engine exhaust heat exchangers and combustion heaters

2

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

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

3

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

Is dumped overboard

4

Why is it necessary to provide overheat protection for anti-icing systems that use turbine engine bleed air

Is hot enough to cause damage to the aircraft structure

5

Can the operation of an electrically heated pitot tube be checked with the aircrafts ammeter and if so how

Yes turn the pitot heater on and observe the deflection of the ammeter needle

6

Describe several potential problems associated with electrically heated windshields

Arcing, delamination, scratches, and discoloration

7

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

automatically cycle the boots, proper rest time, and recycle the boots

8

What are the two common methods of inflating pneumatic deicer boots

Bleed air or the exhaust driven vacuum pump

9

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

Suction is applied to the boots

10

Why do some deicer boots systems incorporate an oil separator

If a wet pump system is used the oil must be removed before it reaches the boots because the oil will damage the rubber

11

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

Adhesives, fairing strips, and screws

12

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

Consult manufactures service manual and follow repair instructions exactly how it says

13

Describe the methods commonly used to remove rain from a windshield

Windshield wipers, a blast of air, or chemical rain repellent

14

What power source are used to operate windshield wipers

Electrical or hydraulic power

15

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

Insufficient blade pressure and blades don't move fast enough

16

Describe the operation of a pneumatic rain removal system

A high velocity air blast prevents the rain from hitting the windshield

17

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

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

18

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

In reference material provided by manufacturer

19

What is used to clean deicer boots

A mild soap and water solution

20

What must be done before you can make a cold patch repair to a deicer boot

Deicer boot must be relieved from it's installed tension before applying the patch

21

What component of a pneumatic deicer system normally allows suction to be supplied to the boots to hold them down in flight

Solenoid distributor valve

22

Describe the operating principle of thermal anti-icing systems

used for preventing ice from forming on the leading edge, also used to deice the leading edges by supplying really hot air for a short period of a time

23

What does arcing usually indicate in an electrical heated windshield

Indicates that there is a breakdown in the conductive coating

24

What is windshield delamination

Is the separation of the plies

25

What controls the temperature in a thermal anti-icing system

Hot and cold air mixed

26

What are the affects of arcing on an electrically heated windshield

Overheating and damage to the windshield