11.12 Flashcards
What is clear ice and how is it formed
Aka glaze ice
Formed when only some of the droplet freezes
What is rime ice
Small droplets are supercooled
Lighter then clear
What effects does ice have on aircraft
Increase drag and reduce thrust
Increase weight and decrease lift
Where are wing inspection lights
Each side of fuselage foward section
What are visual ice indicators
Posts on the windshield , if ice forms tells the pilot the aircraft is icing over
What angle is a hot rod detector
30 degrees
How can we deice the hot rod detector
It has a heated element within it which is operated by press button in cockpit
What are the number of holes in a pressure operated ice detector
4 holes in leading edge
2 holes in trailing edge
Where is a rotory detector placed and what motor is it
Forward fuselage and has a single phase ac motor
What frequency does a vibrating probe operate
40Khz
How does the sangamo western ice detector work
Icy conditions are detected rather then ice formation
What are the 3 parts of the element ice sensing unit
Moisture detector controller
Moisture sensing head
Thermal switch
What is the sunstrand system
Uses beta particles that release from a strong 90 radiation source
How does primary manual work
Ice detection alters crew and they activate ice protection manually
What are ice detection alerts
Visual and/or audio alerts to draw flight crews attention
How do we thermal pneumatic anti ice
Warm air into piccolo tubes then gets spread over inner surface of aerofoil
What air is used for wing anti ice system
Air bled off from engines
Why are joining sections of ducting hermetically sealed
To prevent the loss of air
When can we use the wai system
In the air and ground tests
What is the wai valve and what does it control
Electrically controlled and Pneumatically actuated
Controls the flow of bleed air from the pneumatic system
What air is used in engine anti ice and how is it controlled
Bleed air is used and is Pneumatically actuated to control flow of air
What force do windshields need to withstand
4lbs
Where are hearing elements in a windshield
Inside of outer glass ply
What is a high heat level
Higher intensity of heat to smaller precise area
What is normal heating level
Heat to the broadest area of windshield
Disadvantage of tkstm
Only carry a certain amount that can run out
What are pneumatic de ice boots
They expand with pneumatic air and break away ice when it forms
How quick are boots inflated
6 to 8 seconds and deflated by vaccine section
In small aircraft how is the de-ice system used
Pilot has to manually start the inflation/deflation cycle
How do you trouble shoot de icer boot
ATA chapter 30
What anti ice fluid is used
Isopropyl alcohol
What anti ice fluid is used
Isopropyl alcohol
Where are the heating elements on a propeller to de ice
Internally and externally on the propeller spinner and blades
How long are propeller electrical de icing periods
15-30 seconds
How long is a propeller electrical de icing cycle
2 minutes
When should chemical rain repellent be used
Very wet conditions as dry windows undiluted repellent restricts visibility
What windshield coating is used
Hydrophobic coating
(never polish or wax windows with this coating)
How do you clean hydrophobic windshields
50/50 isopropyl and deionised/distilled water
Soft cloth or nonabrasive paper towel
What is pneumatic rain removal
Hot air that beaks up raindrops and heats windshield to stop moisture from freeezing
Air supplied by electric blower and bleed air
When is caution necessary with probes
They can become very hot
What’s used to heat water and drain lines
Heater blankets
In-line heaters
Heater boots
How are flight crew windshields operated
Separate systems to maintain clear vision if one window system fails
What are the 3 parts of a wiper
Wiper
Wiper arm
Wiper motor/converter
How many cycles in a low wiper mode
160 cycles per minute
How many cycles in a low wiper mode
160 cycles
How many cycles in a high wiper configuration
250 per minute
What caution should you take with the wiper system before carrying out any maintenance
Window heat circuit breakers on to prevent electrical shock
