De-icing Flashcards
Is the de-icing system hydraulically operated?
No, it’s electrically operated
How many de-icing systems are there?
Two
- Airframe and propeller system
- Windshield
What to the proportioning units do?
Regulate the flow of fluid to porous panels (weep) on the LE of wings, fin and horizontal stabiliser and slinger rings on the propeller
How does the fluid get to the proportioning units?
Two electric pumps pump fluid to proportioning units in each engine nacelle and aircraft tail
Why do the proportioning units regulate fluid to windshield?
Because a separate distribution supplies to the windshield.
How does the windshield de-ice?
Two pumps feed fluid to spray bar directed onto windshield. One pump normally active.
Operates for 5secs after each button press.
What is the capacity of the de-icing tank?
Hold 30l useable
When does the de-ice low level warning come on? And how long does it last?
When there is 10l left
Lasts for 45mins on Normal mode
Minimum de-icing fluid needed when flying into known icing conditions?
Need at least 22l -> 1.5hrs on Normal mode
Describe Normal mode.
- Flow and operation
Both pumps intermittent fluid flow.
30secs on 90secs off
Max operating 2.5hrs
Describe High mode.
- Flow, when and operation
Pump continuous flow of fluid
Used when ice built up on airframe
Operates for 1hr
Describe High and Max mode.
- Flow, when and operation
Both pumps operate continuously
For 2mins
In severe ice conditions
Max 30mins
What is the mass of de-ice tank?
1.1kg/l or 9.2lbs/USGal
Effect on CG when carrying no de-icing fluid on a flight?
CG will move forward as fuel is burned during flight
Can icing affect the instruments?
Could expect loss of static instruments
-> open alternate static
