Ice and Rain Control Systems Flashcards
Prior to installation of a pneumatic surface bonded type deicer boots, on leading edge of the wing, you should
remove all paint from the area to be covered by the deicer boot
Which of the following are found in a laminated integral electrically heated windshield system?
Autotransformer, heat control relay, heat control toggle switch and indicating light
When repairing a laminate structure, the repair must preserve the ________ of the original part.
Electrical bonding
What is one check for proper operation of a pitot static tube heater after replacement?
Ammeter reading
What controls that inflation swquence 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 if off?
Suction relief valve
What may be used to clean deicer boots?
Soap and water
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 reading 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
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 seperator in the pneumatic deicing system?
To protect the deicer boots from oil deterioration
Where are the heat elements located on most aircraft with electrically heated windsheilds?
Laminated in the glass
Two possible sources of heat for the operation of a wing thermal anti-icing system are
compressor bleed air, aircraft electrical system
What maintains normal windshield temperature control in a electrically heated windshield system?
Thermistors
Arcing in an electrically heated windshield panel usually indicates a breakdown in the
conductive coating
Which of the following connects vacuum to the deicer boots when the systems 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 alternatively inflated?
Alternate inflation of deicer boots tubes keeps disturbance of the airflow to a minimum
What system components aids in the prevention of carburetor icing?
Alcohol injection nozzle (could say heated induction air)
Why should a chemical rain repellent not be used on a dry windshield?
It will restrict visibility
What is the principle characteristic of a windshield pneumatic rain removal system?
An airblast forms a barrier that prevents rain drops from striking the windshield surface
What mixture may be used as a deicing fluid to remove from form an aircraft surface?
Ethylene glycol and isopropyl alcohol
