Ice and Rain Control Systems

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

A brush or a squeegee

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

Carburetor ice

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

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

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?

Whenever icing conditions are first encountered or expected to occur

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

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

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

Thermo-cycling switches

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

Laminated in the glass

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

compressor bleed air and aircraft electrical system

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

Thermistors

What system component aids in the prevention of carburetor icing?

Air diverter butterfly

What are three methods of anti-icing aircraft Windshields?

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

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

Hot air

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

Thermistor

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

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

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

Distributor valve

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

Vane-type pump

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

Suction relief valve

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

To sequence the deicer boots inflations

symmetrically

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

To protect the deicer boots from oil deterioration

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?

Distributor valve

How do deicer boots help remove ice accumulations?

By breaking up ice formations

Why are the tubes in deicer boots alternately Inflated?

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

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

Ethylene glycol and isopropyl alcohol

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

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

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

Ammeter reading

What may be used to clean deicer boots?

Soap and water

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

conductive coating

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

It will restrict visibility