EMB120 Icing System

Question 1

Where does the Bleed air come from for the boots?

Answer 1

P3

Question 2

How do the boots knock the ice off?

Answer 2

The boots inflate to ridges to help knock the ice off

Question 3

are the boot timers connected?

Answer 3

No they are not connected but they are identical systems

Question 4

What cycle are the the boots on?

Answer 4

6 sec for each boot on a 1 min cycle

There are 4 sections on the boots

Question 5

What Nh % do we need to for the boots to work?

Answer 5

80% Nh

Question 6

When does the cold setting get turned on for the prop ice?

Answer 6

below -10c

Question 7

What oil pressure is needed to for the prop deice?

Answer 7

40PSI

Question 8

What DC is the Pito tube #1 on?

Answer 8

EDC2

Question 9

When are windshield wipers not turned on?

Answer 9

Dry windshields

Question 10

How does the ice detection probe work?

Answer 10

It vibrates at a specified frequency, when ice begins to accumulate the frequency of the vibration changes indicating ice

Question 11

What is the HOT 7 and when are they turned on?

Answer 11

Pito static
slip
AOA
TAT

and before takeoff

Question 12

What is turned on with the first indication of ice?

Answer 12

Boots
Prop deice 
Engine air boots
windshield heat 
ignitions

Question 13

Icing with 25 degree flaps what is VREF?

Answer 13

VREF +10kts

Question 14

Icing with 45 degree flaps what is VREF?

Answer 14

VREF +5kts

Question 15

What is the timer cycle for the engine air inlet boots?

Answer 15

3 min cycle

6 sec inflated

Question 16

What is the timer cycle for the prop deice?

Answer 16

Norm - 10 secs on, 60 off

Cold - 20 sec on, 60 off

Question 17

When do we turn on icings on the ground and what is turned on?

Answer 17

10 degree C and below in visible moisture, everything but the leading edge boots