Ice and Rain Control Systems

Question 1

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

Answer 1

remove all paint from the area to be covered by the deicer boots.

Question 2

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

Answer 2

Autotransformer, heat control relay, heat control toggle switch, and indicating light.

Question 3

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

Answer 3

Ammeter reading.

Question 4

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

Answer 4

Distributor valve.

Question 5

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

Answer 5

Vane-type pump.

Question 6

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 6

Suction relief valve.

Question 7

What may be used to clean deicer boots?

Answer 7

Soap and water.

Question 8

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

Answer 8

Whenever icing conditions are first encountered or expected to occur.

Question 9

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

Answer 9

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

Question 10

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

Answer 10

Thermo-cycling switches.

Question 11

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

Answer 11

To sequence the deicer boots inflations symmetrically.

Question 12

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

Answer 12

To protect the deicer boots from the oil deterioration.

Question 13

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

Answer 13

Laminated in the glass.

Question 14

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

Answer 14

Compressor bleed air and aircraft electrical system.

Question 15

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

Answer 15

Thermistors.

Question 16

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

Answer 16

Conductive coating.

Question 17

What system component aids in the prevention of carburetor icing?

Answer 17

Alcohol injection nozzle.

Question 18

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

Answer 18

A brush or a squeegee.

Question 19

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

Answer 19

Carburetor ice.

Question 20

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

Answer 20

Hot air.

Question 21

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

Answer 21

Thermistor.

Question 22

What are three methods of anti-icing aircraft windshields?

Answer 22

An electric heating element in the windshield, a heated air circulating system, and windshield wipers and anti-icing fluid.

Question 23

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

Answer 23

It will restrict visibility.

Question 24

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

Answer 24

Ethylene glycol and isopropyl alcohol.

Question 25

Why are the tubes in deicer boots alternately inflated?

Answer 25

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

Question 26

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

Answer 26

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

Question 27

How do deicer boots help remove ice accumulations?

Answer 27

By breaking up ice formations.

Question 28

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

Answer 28

Distributor valve.