Ice Protection

Question 1

T or F: de-icing systems are used to get rid of ice that has already formed.

Answer 1

True.

Question 2

T or F: de-icing systems are used to prevent icing from forming.

Answer 2

False.

Question 3

T or F: anti-icing systems are used to prevent ice from forming.

Answer 3

True.

Question 4

T or F: anti-icing systems are used to get rid of ice that has already formed.

Answer 4

False.

Question 5

How many electronic ice detection proves are installed on the aircraft?

Answer 5

Two.

Question 6

Where are the electronic ice detection probes located on the aircraft?

Answer 6

Either side of the front fuselage.

Question 7

How much ice needs to be detected before an indication is displayed on the ED?

Answer 7

0.5 mm.

Question 8

T or F: when the ice detection probes detect ice, they heat to melt the ice off.

Answer 8

True.

Question 9

When will the ICE DETECT FAIL caution light illuminate?

Answer 9

If both ice detection probes fail.

Question 10

T or F: if one ice detection probe is not working, no alert is provided.

Answer 10

True.

Question 11

What inflates the de-icing boots?

Answer 11

Bleed air from each engine.

Question 12

Which aircraft structures do not have deicing boots that use bleed air?

Answer 12

Boots are found on: leading edges of wings, horizontal/vertical stabilizers, engine nacelle inlet lips.

Question 13

T or F: boot inflation for all the de-ice boots is regulated by a single distributor valve.

Answer 13

False. It is a dual distributing valve.

Question 14

In order for the TMU to send signals automatically, the airframe mode select switch must not be selected to which position?

Answer 14

Manual.

Question 15

How long does each de-ice boot inflate?

Answer 15

6 seconds.

Question 16

T or F: if a malfunction occurs in the automatic timer, the boots can be inflated manually.

Answer 16

True.

Question 17

When should pilots move to the next boot position when using the deicing boots in manual mode?

Answer 17

When the light illuminates.

Question 18

T or F: the DDVs and check valves have integral heaters which are automatically activated.

Answer 18

True.

Question 19

What is the normal position for the airframe mode select switch?

Answer 19

Manual.

Question 20

T or F: if the TMU temperature monitoring detector fails, the valve heaters default to a permanent ON position to ensure they remain heated?

Answer 20

True.

Question 21

When a pneumatic line ruptures on either side of the aircraft, the de-ice system should be set to ____.

Answer 21

ISO.

Question 22

T or F: all the boots on the horizontal and vertical stabilizers are pneumatically cross-connected.

Answer 22

True.

Question 23

When will the DEICE PRESS caution light illuminate?

Answer 23

If the pneumatic pressure available to either side is less than 15 psi, boot pressure doesn’t reach 15 psi after the DDV opens, or boot pressure stays at 15 psi after the DDV closes.

Question 24

What heats the propellor blades?

Answer 24

Electrical power.

Question 25

T or F: the heater cycle for each propeller is controlled by a timer monitor control unit.

Answer 25

True.

Question 26

T or F: the TMCU adjusts prop heat cycle times depending on the total air moisture.

Answer 26

False, it is dependent on the total air temperature.

Question 27

The total air temperature must be equal to or lower than ____ for the propeller heaters to operate.

Answer 27

5ºC.

Question 28

T or F: the propellers alternate being heated to reduce electrical load.

Answer 28

True.

Question 29

T or F: both propellers are heated at the same time.

Answer 29

False, they alternate.

Question 30

What do the prop indicator lights on the Ice Protection panel indicate when illuminated?

Answer 30

That the related propeller is being heated.

Question 31

The TMCU can only begin a propeller heating cycle if Np is above ____.

Answer 31

400 RPM.

Question 32

Which statement is true regarding prop heat duration as it relates to temperature?

Answer 32

The colder it is, the longer it heats.

Question 33

Once pilots have performed a propeller heat test, how long must they wait until the next propeller test can be performed?

Answer 33

30 seconds.

Question 34

When is the engine intake heat energized?

Answer 34

When the engine bypass doors are opened.

Question 35

What air temperature causes the engine heater to energize?

Answer 35

Less than or equal to 15ºC.

Question 36

How are the static ports heated?

Answer 36

Electrically (115v AC).

Question 37

How are the pitot tubes heated?

Answer 37

Electrically (#1 and #2 are 115v AC, standby is DC).

Question 38

How many volts are needed to power the #1 and #2 probe heaters?

Answer 38

115V AC.

Question 39

When set to NORM, the windshield is being heated at ____.

Answer 39

Full power.

Question 40

How many wiper blades are installed on the aircraft?

Answer 40

Two.

Question 41

Anti-ice equipment is primarily powered by what source?

Answer 41

115V AC.

Question 42

T or F: boot inflation time is the same in both fast and slow modes.

Answer 42

True.

Question 43

T or F: all propeller blades on both engines are heated at the same time.

Answer 43

False, they alternate engines.

Question 44

Which of the following statements best describes AOA vane heat?

Answer 44

Automatic.

Question 45

Which window in the flight deck is not heated?

Answer 45

Right side window.