Ice & Rain Control Systems Flashcards
What maintains normal windshield temperature control in an electrically heated windshield system?
Thermistors
Two possible sources of heat for the operation of a wing thermal anti-icing system are
Compressor bleed air and aircraft electrical system.
Arcing in an electrically heated windshield panel usually indicates a breakdown in the
Conductive coating
Why are the tubes in deicer boots alternately inflated?
Alternate inflation of deicer boot tubes keeps distance of the airflow to a minimum
What may be used to clean deicer boots?
Soap and water
Which of the following is the best means to use when removing wet snow from an aircraft?
A brush or squeegee
Why should a chemical rain repellant not be used on a dry windshield?
It will restrict visibility.
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
1,2,3,5
What icing condition may occur when there is no visible moisture present?
Carburetor ice
What should be used to melt the ice in a turbine engine if the compressor is immobile because of the ice
Hot air
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 used as a temperature-sensing element in an electrically heated windshield?
Thermistor
What mixture may be used as a deicing fluid to remove frost from an aircraft surface?
Ethylene glycol and isopropyl alcohol
How do deicer boots help remove ice accumulations?
By breaking up ice formations
What are the heating elements located on most aircraft with electrically heated windshields?
Laminated in the glass
What is the purpose of the oil separator in the pneumatic deicing system?
To protect the deicer boots from oil deterioration.
What system component aids in the prevention of carburetor icing?
Alcohol injection nozzle.
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.
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 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
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?
Whenever icing conditions are first encountered or expected to occur.
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 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.
2,3,5
What is one check for proper operation of a pitot-static tube heat after replacement?
Ammeter reading
What method is usually employed to control the temperature of an anti-icing system using surface combustion heaters?
Thermo-cycling switches.
