Ice Protection

Question 1

what is the sequence of the boots cycle

Answer 1

Horizontal stabilizer 8 sec
Wings bottom inboard 8 sec
Wings top inboard 8 sec
Wings bottom outboard 8 sec
Wings top outboard 8 sec

1 min = 40 sec boots on / 20 off
3 min = 40 sec boots on/ 140 off

Question 2

BOOTS
Normal operating pressure,
Relief valve activation pressure
Minimum pressure before caw’s

Answer 2

14 PSI normal OPS
Relief valve at 18 PSI
min 10/11 PSI

Question 3

Limitation of flaps with operating boots

Answer 3

Flaps 15

Question 4

Operation of the surface deice system in ambient temperatures below ___ or above___ may cause permanent damage to the deice boots

Answer 4

-40
+40

Question 5

When probes are active, which systems are heated?

Answer 5

Pitot Tube
AOA Sensor
Static Port

Question 6

The EIS OAT is programmed to blink, and Amber EIS CAUTION will illiminate, when the Outside Air Temperature
Is less than ___ °C and PROBES has not be selected On or the relay has failed

Answer 6

4 °C

Question 7

PROBES are powered by____ , and on which bus are they located?

Answer 7

Powered by 28 VDC
BAT BUS

Question 8

On which side is the captain’s pitot located?

Answer 8

RH side

Question 9

if the Windshield exceeds _____ degrees, the power will be cut off to prevent overheating

Answer 9

60 degrees

Question 10

How much pressure or what type of pressure will be retained in the boots when they are off?

Answer 10

-Bleed air passes through the control valve ejector and dump oulet creating the vaccum which holds the boots deflated
-Negative pressure

Question 11

how the Engine Air Intake Lip Heat system works

Answer 11

Exhaust gases from left exhaust

Question 12

Prop Deice

The system is powered by____
and is connected to____Bus and____Bus

Answer 12

28VDC
BAT BUS
AND
GEN 1 BUS

Question 13

PROP DEICE
How the “mode” are selected?
What’s the difference between the three cycles?

Answer 13

Mainly Left OAT sensor

Mode 1:
0°C and over
Standby/ off
Mode 2:
Between 0°C and -16°C
45 sec On and then 90 sec off
Mode 3:
-16°C and below
90 sec On without pause

Question 14

what can make caw’s light {PROP DEICE} light up?

Answer 14

-Left OAT sensor failure
-Disparity between Left and Right OAT Sensors (+ 5°C )
-Incorrect deice boot supply voltage
-Self test failure

Question 15

When using ice mode, pusher activation will occur ___ degrees earlier.

Answer 15

8 degrees

Question 16

Approach speed with flaps 15 ice mode

Answer 16

105/45 and 47

Question 17

Approach speed with flaps 0 ice mode

Answer 17

130 /45 and 47

Question 18

Go-around boots failed, flaps 0 ( ice mode)
____IAS

Answer 18

134 /45
140 /47