Ice And Rain

Question 1

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

Answer 1

Bleed air, engine exhaust heat exchangers and combustion heaters

Question 2

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

Answer 2

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

Question 3

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

Answer 3

Is dumped overboard

Question 4

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

Answer 4

Is hot enough to cause damage to the aircraft structure

Question 5

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

Answer 5

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

Question 6

Describe several potential problems associated with electrically heated windshields

Answer 6

Arcing, delamination, scratches, and discoloration

Question 7

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

Answer 7

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

Question 8

What are the two common methods of inflating pneumatic deicer boots

Answer 8

Bleed air or the exhaust driven vacuum pump

Question 9

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

Answer 9

Suction is applied to the boots

Question 10

Why do some deicer boots systems incorporate an oil separator

Answer 10

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

Question 11

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

Answer 11

Adhesives, fairing strips, and screws

Question 12

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

Answer 12

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

Question 13

Describe the methods commonly used to remove rain from a windshield

Answer 13

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

Question 14

What power source are used to operate windshield wipers

Answer 14

Electrical or hydraulic power

Question 15

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

Answer 15

Insufficient blade pressure and blades don’t move fast enough

Question 16

Describe the operation of a pneumatic rain removal system

Answer 16

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

Question 17

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

Answer 17

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

Question 18

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

Answer 18

In reference material provided by manufacturer

Question 19

What is used to clean deicer boots

Answer 19

A mild soap and water solution

Question 20

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

Answer 20

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

Question 21

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

Answer 21

Solenoid distributor valve

Question 22

Describe the operating principle of thermal anti-icing systems

Answer 22

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

Question 23

What does arcing usually indicate in an electrical heated windshield

Answer 23

Indicates that there is a breakdown in the conductive coating

Question 24

What is windshield delamination

Answer 24

Is the separation of the plies

Question 25

What controls the temperature in a thermal anti-icing system

Answer 25

Hot and cold air mixed

Question 26

What are the affects of arcing on an electrically heated windshield

Answer 26

Overheating and damage to the windshield