Propeller Ice Protection Flashcards
2 types of ice protection
Fluid anti ice
Electrical de-ice
Where is fluid anti ice used
Piston aircraft
Why can’t you use fluid of GTE
Compressor damaged by iso-propyl alcohol
What’s does the rheostat control
Speed of pump that directs fluid to slinger ring
How does fluid get forced into grooved anti icing rubber boots
Centrifugal force
What shape is the slinger ring
U shaped
Disadvantages of de-icing
Weight of fluid
Amount monitored
Needs to be operated before icing occurs
Can’t remove ice once it’s impacted
What do heated boots / mats contain
Electrical elements
Where are hearing boots/mats bonded
To inner third of each propeller blade
Fast cycle
2 minutes at 10 degrees - 6
Slow cycle
6 minutes at -6 and below
Why do we need to do continuity & resistance checks on heated elements
Ensure the heating elements are adequately insulated from blades & spinner
Why is it important no elements is exposed
Moisture can increase resistance
What manual limitations do we need to comply with
Operating heating elements on ground
