ICE AND RAIN CONTROL SYSTEM

Question 1

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

Answer 1

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

Question 2

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 2

1,2,3,5

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 guage

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 oil deterioration

Question 13

Where are the heat sensors located on most aircraft with electrically heated windshields?

Answer 13

imbedded in the glass

Question 14

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

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

Answer 16

conductive coating

Question 17

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 17

distributor valve

Question 18

How do deicer boots help remove ice accumulations?

Answer 18

by breaking up ice formation

Question 19

Why are the tubes in deicer boots alternately inflated?

Answer 19

alternate inflation of deicer boot tubes keep disturbance of the airflow to a minimum

Question 20

Carburetor icing may be eliminated by which of the following methods?

Answer 20

alcohol spray and heated induction air

Question 21

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

Answer 21

it will restrict visibility

Question 22

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

Answer 22

an airblast forms a barrier that prevents raindrops from striking the windshield surface

Question 23

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

Answer 23

ethylene, glycol, and isopropyl alcohol

Question 24

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

Answer 24

a brush or a squeegee

Question 25

What are three methods of anti-icing aircraft windshields?
1. Blanket-type heating system.
2. An electric heating element in the windshield.
3. Heated air circulating system.
4. Hot water system.
5. Windshield wipers and anti-icing fluid.
6. Ribbon-type heating system.

Answer 25

2,3,5

Question 26

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

Answer 26

carburetor ice

Question 27

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

Answer 27

hot air

Question 28

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

Answer 28

thermistor