Ice & Rain Control Systems

Question 1

What maintains normal windshield temperature control in an electrically heated windshield system?

Answer 1

Thermistors

Question 2

Two possible sources of heat for the operation of a wing thermal anti-icing system are

Answer 2

Compressor bleed air and aircraft electrical system.

Question 3

Arcing in an electrically heated windshield panel usually indicates a breakdown in the

Answer 3

Conductive coating

Question 4

Why are the tubes in deicer boots alternately inflated?

Answer 4

Alternate inflation of deicer boot tubes keeps distance of the airflow to a minimum

Question 5

What may be used to clean deicer boots?

Answer 5

Soap and water

Question 6

Which of the following is the best means to use when removing wet snow from an aircraft?

Answer 6

A brush or squeegee

Question 7

Why should a chemical rain repellant not be used on a dry windshield?

Answer 7

It will restrict visibility.

Question 8

Which of the following are found in a laminated integral electrically heated windshield system?

1) Autotransformer
2) Heat control relay
3) Heat control toggle switch
4) 24V dc power supply
5) indicating light

Answer 8

1,2,3,5

Question 9

What icing condition may occur when there is no visible moisture present?

Answer 9

Carburetor ice

Question 10

What should be used to melt the ice in a turbine engine if the compressor is immobile because of the ice

Answer 10

Hot air

Question 11

Prior to installation of a pneumatic surface-bonded type deicer boots, on the leading edge of the wing, you should

Answer 11

Remove all paint from the area to be covered by the deicer boot.

Question 12

What controls the inflation sequence in a pneumatic deicer boot system?

Answer 12

Distributor valve

Question 13

What is used as a temperature-sensing element in an electrically heated windshield?

Answer 13

Thermistor

Question 14

What mixture may be used as a deicing fluid to remove frost from an aircraft surface?

Answer 14

Ethylene glycol and isopropyl alcohol

Question 15

How do deicer boots help remove ice accumulations?

Answer 15

By breaking up ice formations

Question 16

What are the heating elements located on most aircraft with electrically heated windshields?

Answer 16

Laminated in the glass

Question 17

What is the purpose of the oil separator in the pneumatic deicing system?

Answer 17

To protect the deicer boots from oil deterioration.

Question 18

What system component aids in the prevention of carburetor icing?

Answer 18

Alcohol injection nozzle.

Question 19

Which of the following indications occur during a normal operational check of a pneumatic deicer system?

Answer 19

Fluctuating readings on the pressure gauge and relatively steady readings on the vacuum gauge.

Question 20

Which of the following connects vacuum to the deicer boots when the system is not in operation, to hold the boots tightly against the leading edges in flight?

Answer 20

Distributor valve.

Question 21

How is the source of pressure for inflating deicer boots on reciprocating engine aircraft?

Answer 21

Vane-type pump

Question 22

Which of the following regulates the vacuum of the air pump to hold the deicing boots deflated when the pneumatic deicing system is off?

Answer 22

Suction relief valve

Question 23

What is the purpose of the distributor valve in a deicing system utilizing deicer boots?

Answer 23

To sequence the deicer boots inflations symmetrically

Question 24

Some aircraft are protected against airframe icing by heating the leading edges of the airfoils and intake ducts. When is the type of anti-ice system usually operated during flight?

Answer 24

Whenever icing conditions are first encountered or expected to occur.

Question 25

What is the principle characteristic of a windshield pneumatic rain removal system?

Answer 25

An air blast forms a barrier that prevents raindrops from striking the windshield surface.

Question 26

What are three methods of anti-icing aircraft windshields?

1) Blanket-type heating system.
2) An electric heating element in the windshields?
3) Heated air circulating system.
4) Hot water system.
5) Windshield wipers and anti-icing fluid.
6) Ribbon-type heating system.

Answer 26

2,3,5

Question 27

What is one check for proper operation of a pitot-static tube heat after replacement?

Answer 27

Ammeter reading

Question 28

What method is usually employed to control the temperature of an anti-icing system using surface combustion heaters?

Answer 28

Thermo-cycling switches.