ICE AND RAIN CONTROL SYSTEM Flashcards
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
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 is one check for proper operation of a pitot/static tube heater after replacement?
ammeter reading
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 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 readings on the pressure gauge and relatively steady readings on the vacuum guage
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 separator in the pneumatic deicing system?
to protect the deicer boots from oil deterioration
Where are the heat sensors located on most aircraft with electrically heated windshields?
imbedded 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
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 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 formation
Why are the tubes in deicer boots alternately inflated?
alternate inflation of deicer boot tubes keep disturbance of the airflow to a minimum
Carburetor icing may be eliminated by which of the following methods?
alcohol spray and heated induction air
Why should a chemical rain repellant 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 raindrops from striking the windshield surface
What mixture may be used as a deicing fluid to remove frost from an aircraft surface?
ethylene, glycol, and isopropyl alcohol
Which of the following is the best means to use when removing wet snow from an aircraft?
a brush or a squeegee
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.
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 ice?
hot air
What is used as a temperature-sensing element in an electrically heated windshield?
thermistor
