Ice Protection

Question 1

What is the purpose of the optional TKS ice protection system?

Answer 1

Permits flight into known icing conditions, except for specific conditions.

Question 2

List the conditions under which the TKS ice protection system should not be used.

Answer 2

• Forecast icing conditions greater than MODERATE
• Freezing rain
• Freezing drizzle
• Ambient temperatures below -30˚C

Question 3

What does the TKS ice protection system distribute on the aircraft’s surfaces?

Answer 3

A film of fluid on the wings, horizontal and vertical stabilizer, propellers, and canopy.

Question 4

When should the TKS ice protection system be activated for best results?

Answer 4

Prior to icing encounters.

Question 5

How many airframe pumps and filters are included in the TKS ice protection system?

Answer 5

2 airframe pumps and filters.

Question 6

Where are the windshield de-icing pumps located?

Answer 6

In the nose compartment.

Question 7

What do the proportioning units in the TKS system do?

Answer 7

Regulate fluid flow.

Question 8

What is the capacity of the fluid reservoir in the TKS ice protection system?

Answer 8

7.9 gallons.

Question 9

What is the weight of the fluid reservoir in the TKS ice protection system?

Answer 9

72.7 pounds.

Question 10

How many LED ice detection lights are included in the TKS ice protection system?

Answer 10

2 LED ice detection lights.

Question 11

What material are the leading edge panels of the TKS system made from?

Answer 11

Porous, stainless steel.

Question 12

What components are included in the TKS ice protection system?

Answer 12

• Airframe pumps and filters
• Windshield de-icing pumps
• Proportioning units
• Fluid reservoir
• LED ice detection lights
• Leading edge panels
• Propeller nozzles and slinger rings
• Windshield spray bar

Question 13

True or False: The TKS ice protection system allows flight into severe icing conditions.

Answer 13

False.

Question 14

Fill in the blank: The TKS ice protection system is designed to activate before _______ encounters.

Answer 14

[icing]

Question 15

What are the positions of the 3 position switch?

Answer 15

OFF, NORM, HIGH

Question 16

What is the function of the momentary switch?

Answer 16

MAX mode (used with HIGH mode ON)

Question 17

What color is the NORM indicator light?

Answer 17

White

Question 18

What color is the HIGH indicator light?

Answer 18

Amber

Question 19

What color is the MAX indicator light?

Answer 19

Amber

Question 20

What does the pump selector switch control?

Answer 20

Pump 1 / Pump 2

Question 21

What is the purpose of the Ice Light / DEIC PRES LO annunciator test switch?

Question 22

What does the alternate power switch do?

Question 23

What is the function of the windshield deice?

Question 24

How are the airframe and windshield fluid distribution systems designed?

Answer 24

Separate, redundant fluid pumps

Question 25

What happens when the DEIC PRES LO is displayed?

Answer 25

Pump selector switch changes active pump for both airframe and windshield systems

Question 26

What occurs when HIGH mode is selected and the MAX button is depressed?

Answer 26

Standby airframe pump runs concurrently with the active pump for maximum fluid flow for two minutes

Question 27

What happens after the two minutes of MAX mode?

Answer 27

The system will return to HIGH mode

Question 28

What does the NORM selection indicate on the ice protection system?

Answer 28

The lower, white indicator light will illuminate ## Footnote Indicates normal operation mode.

Question 29

What happens when HIGH is selected and the MAX button is pressed?

Answer 29

The middle and upper amber lights will illuminate for two minutes ## Footnote This indicates a temporary boost in ice protection.

Question 30

What message may be displayed when activating HIGH mode at temperatures below 10˚C?

Answer 30

DEICE PRES LO ## Footnote Indicates low deice pressure.

Question 31

How long does the WINDSHIELD push button provide fluid flow?

Answer 31

5 seconds ## Footnote Activates the windshield spray bar.

Question 32

What happens if the Electric master switch is ON and the canopy is open when pressing the WINDSHIELD button?

Answer 32

De-icing fluid will spray into the cockpit ## Footnote This occurs even if the airframe ice protection switch is OFF.

Question 33

What is the normal power source for the airframe ice protection system?

Answer 33

LH main bus ## Footnote The system can switch to RH main bus if LH fails.

Question 34

What is the endurance of the airframe ice protection system when the ALTERNATE switch is ON?

Answer 34

1 hour ## Footnote Assumes a full reservoir.

Question 35

What is the capacity of the fluid reservoir?

Answer 35

7.9 gallons ## Footnote Located in the right nose baggage compartment.

Question 36

What message is displayed when fluid level is below 2.6 gallons?

Answer 36

DEICE LVL LO ## Footnote Indicates low fluid level.

Question 37

What is the density of approved de-icing fluid AL-5?

Answer 37

9.2 pounds per gallon ## Footnote Affects total weight calculations.

Question 38

What is the minimum fluid requirement for dispatch into known icing conditions?

Answer 38

5.8 gallons ## Footnote Provides 90 minutes of protection.

Question 39

What is the minimum operating temperature for the aircraft?

Answer 39

-30˚C ## Footnote Below this, operations may be unsafe.

Question 40

What should be done if ice accumulates aft of protected surfaces?

Answer 40

Disengage autopilot ## Footnote Also do this if trim warnings occur.

Question 41

What is the minimum climb speed for the DA42NG?

Answer 41

118 KIAS ## Footnote Ensures safe ascent performance.

Question 42

What is the minimum approach speed with Flaps APP?

Answer 42

90 KIAS ## Footnote Critical for landing safety.

Question 43

List the ice protection CAS messages.

Answer 43

* DEICE LVL LO * DEICE PRES HI * DEIC PRES LO ## Footnote Indicate various system statuses.