Ice/Rain/Waste Systems Flashcards
What must all aircraft that operate in weather conditions where ice is likely to form be provided with?
Ice protection
Ice increases _______ and reduces _______
Increases drag
Reduces lift
Ice hampers instrument readings and causes what?
Vibration
What does an anti-icing system do?
Prevents the formation of ice
What does a deicing system do?
Removes ice on the aircraft
What are the deicer boots coated with to dissipate static?
Neoprene
What are on the back side of the deicer boots?
Air connections
How are deicer boots driven?
Pneumatically
What controls the inflation sequence for the deicer boots by directing the vacuum?
The Distributor valve
How is airflow disruption minimized when inflating deicer boots?
Boots are inflated alternately
What holds the boots deflated when the system is off, by regulating the vacuum?
A suction relief valve
What is the purpose of the oil separator in a wet type vacuum pump?
To protect the boots from oil deterioration by removing the oil from the air
How do you remove any grease or oil from a deicer boot?
With Naptha or Soap & Water
Where would you find deicer boot removal procedures?
The Maintenance Manual
How does the Wing Anti-Ice (WAI) System work?
Uses heated air flowing through passages in the wing, or electric resistance heat elements in a “blanket”
The WAI system is an Anti-ice system. TRUE or FALSE?
TRUE
What are the heat sources for thermal anti-icing pneumatic systems?
Combustion heaters, Bleed air, or Augmenter tubes
What components are heated with a Thermal Electric Boot System?
Wing leading edges, or leading-edge slats, horizontal/vertical stabilizer leading edges, and some turbine and turboprop inlets
How are many propellers deiced?
By an electrically heated boot on each blade
With the boot firmly cemented in place, it receives current from what?
A slip ring and brush assembly on the spinner bulkhead
How is the 10 PSI variable output for propeller fluid anti-icing controlled?
By a Rheostat
What are the flow rate ranges for propeller fluid anti-icing?
Less than 1 quart to more than 1 gallon per hour
How is anti-icing fluid ejected from the slinger ring?
Centrifugal Force
How are the heaters controlled for probe anti-icing?
Switches
How can proper operation of the pitot/static tube heat be verified?
With an Ammeter
Carburetor icing is most severe at temperatures between ___-___degrees F.
30 - 40
Carburetor icing can occur in warm weather with no visible moisture. TRUE or FALSE?
TRUE
What are 3 methods of windshield ice control?
-Electric heating element in windshield
-Circulating heated air
-Spraying fluid on the windshield
Where are the heated sensors located for the windshield heating?
Imbedded in the glass
What are 3 things to check for when inspecting the windshield heating?
Delamanation
Scratching
Arcing
When is spraying the windshield normally used?
To clear the windshield prior to landing
What are 3 ways that windshield wiper systems are operated?
Electrically
Hydraulically
Pneumatically
How does the pneumatic rain removal system work?
Uses high velocity compressor bleed air to prevent rain from hitting the windshield
What 2 fluids are used to remove frost?
Ethylene Glycol
&
Isopropyl Alcohol
How is ice removed from turbine engines?
Hot air
How can an operational check of the deicing system be made?
By operating the aircraft systems per operational instruction
Deicing fluid is NONflammable.
TRUE or FALSE?
FALSE
What is used to clean and dry heated windshields?
Clean with Mild Soap & Water
Dry with Chamois or Absorbent Cotton
How are lavatory holding tanks drained?
Through a valve that can only be opened by ground personnel
Water pipes, where icing conditions are likely to occur, are insulated and heated with what?
Electrical tape heaters
What controls the amount of current to the heating elements in a windshield?
Thermistors
What causes arching in electrically heated windshields?
A breakdown of the conductive coating
What are the two types of ice formations?
Rime & Clear/Glaze
