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21 Cards in this Set
- Front
- Back
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Briefly describe the ice protection system on the DA42.
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It's a ‘Weeping wing’ system certified for known icing that distributes a thin film of deicing fluid over the:
-Wing -Horizontal/Vertical Stabilizers -Propellers -Canopy |
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What are some of the characteristics of the de-ice fluid?
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It is glycol based with additives.
Approved fuids are: -AL-5 (DTD 406B) -Aeroshell Compound 07 Note: Use of non-approved fluids can damage the system and provide inadequate protection. |
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How much does the de-ice fluid weigh per gallon?
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9.2 lbs / gal
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Describe the de-ice fluid tank.
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It's a 7.9 gallon tank located in the nose section. It has a low level sensor that warns when there is 45 minutes remaining at the "normal" operating setting.
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Does the nose baggage area maximum weight change depending on the de-ice tank level?
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No, max baggage area weight in the nose is 66lbs independent of deicing fluid level.
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What is the total weight of the de-icing tank with full fluid?
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72.7 lbs
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How does the de-icing fluid get from the tank to the airframe and propellers?
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-There are 2 main pumps which feed the deicing fluid to 2 filters, then on to the 3 proportioning units.
-The 3 proportioning units regulate the flow via capillaries to the porous panels and the propeller slinger rings. |
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How many proportioning units are there? Where are they located?
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There are 3 proportioning units:
-2 In each engine nacelle. -1 In the upper vertical tail (forward of the front spar). |
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What are the porous panels? Where are they located?
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The porous panels weep fluid at a low rate through fine holes. They are located on the leading edge of the:
-Outer wings -Vertical tail -Horizontal tail |
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How do the propeller slinger rings work?
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-They spray fluid into slinger ring mounted on propeller's spinner back plate.
-From there, fluid is distributed through 3 nozzles by the centrifugal force of the spinning plate out onto the propeller. |
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How does the de-icing fluid get onto the windshield?
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-There are 2 pumps with valves installed in nose compartment.
-Only one pump is active and it pumps fluid into the spray-bar. -The switch in the cockpit allows pump selection. |
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What are the different modes of operation of the de-ice system?
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The different modes are:
-Off -Normal -High -Max -Normal and High are selected using the toggle switch. -Max is selected by pressing the max button op the de-icing panel. |
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Describe the normal mode of operation.
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-It is used prior to ice accumulation.
-During normal mode, both pumps run simultaneously. -They cycle: On: 30s Off: 90s The max duration in normal mode is approximately 2.5 hrs based on a full tank. |
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Describe the high mode of operation.
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It is used when ice has already accumulated.
During the high mode, the selected pump runs continuously. The max duration in high mode is approximately 1.0 hrs based on a full tank. |
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Describe the max mode of operation.
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It is used in severe icing conditions.
During the max mode, both pumps run continuously for 2 minutes every time the max button is pressed. The max duration in max mode is approximately 30 minutes based on a full tank. |
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What does the pump switch do?
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It allows you to toggle between pump 1 or 2 in high mode.
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What does the windshield push button do?
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It activates the selected windshield pump for 5 seconds.
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If the main de-icing switch is off and the windshield push button is pressed, will fluid spray out of the spray-bar?
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Yes, it will work even if main switch is off.
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How do you purge air from the de-icing system?
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Press and hold windshield button.
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What main bus is the de-icing system connected to? What do you do if that bus fails?
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-It is connected to the LH main bus.
-If the LH main bus fails, flip the alternate switch. That connects the system to RH main bus. Note: Only high mode on pump #2 is available with the alternate switch on. |
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How do you test the de-ice system?
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Press the Annun-Test test button. This activates a “DEIC PRES LO” caution after 2 minutes.
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