Ice And Rain Protection

Question 0

Describe the ice detection system.

Answer 0

• two automatic independent AC ice protection probes.
• piezoelectric - ice changes probes’ rigidity and therefore the frequency of vibration.
• If either prove detects ice, ICE DETECTED appears on the ED
• After ice is detected, the probes are heated, allowing them to detect ice again.

Question 1

Which ice and rain protecting equipment is heated?

Answer 1

• Leading Edges of the Propeller Blades
• All three pitot static tubes (#3 is DC)
• Both AOA Vanes
• Both windshields and the pilot’s side window
• The engine intake flanges

Question 2

When will the ICE DETECT FAIL caution light b illuminate?

Answer 2

When both ice detection probes fail.

Question 3

Describe the airframe de-icing system.

Answer 3

• 6 sets of boots adhered to leading edges of the wings, empennage, and engine inlets.
• Controlled by the ice protection panel. FAST = 1 minute = 6 seconds per boot set (6x6=36) + 24 seconds dwell. SLOW = 3 minutes.
• P2.7 bleed air continuously supplied to system
• 6 DDVs with integrated heater elements use that air to control inflation and deflation.
• heater elements activate automatically at 5°C or when the mode select knob is at MANUAL.
• boot ISO switch cuts system in half.

Question 4

What does the TMU do?

Answer 4

The De-icing Timer Monitor Unit controls the inflation and deflation of the boots, the heating of the DDVs, AOA Vane heating …

Question 5

When would you use the MANUAL Mode?

Answer 5

DEICE TIMER Caution Light

Question 6

What are two possible causes of a DEICE PRESS Caution Light?

Answer 6

• Loss of system pressure (check DEICE press indicator gauge on copilot panel)
• Continuous inflation or failure of a boot. (Boot leak, or DDV malfunction)

Question 7

Describe the Propeller DEICE SYS.

Answer 7

• Two identical TMCUs control the operation of propeller deicing.
• The TMCUs monitor Np, SAT, and faults.
• The propellers alternate heating cycles.
• “ON” will activate the system, provided that SAT is less than 5°C and Np is greater than 400 RPM.
• Propeller Heat Indicator Lights illuminate with heat activation.

Question 8

What does a PROP DEICE Caution Light Indicate?

Answer 8

TMCU failure.

Question 9

When should the pitot heat be on?

Answer 9

Prior to every flight, regardless of ambient conditions.

Question 10

When do the intake heaters automatically activate?

Answer 10

• Engine intake bypass door is open AND
• Engine is running (positive oil pressure) AND
• SAT is below approximately 15°C AND
• AC Power is available

Question 11

What might a PUSHER SYS FAIL and a STALL SYS FAIL Caution Light Indicate?

Answer 11

AOA Heater Failure.