Ice and Rain Protection

Question 1

With regard to the ice detectors, how many signals are required to get an EICAS message?

Answer 1

Only one. The two detectors provide system redundancy.

Question 2

If the anti-ice systems are OFF when ice is detected, what message is displayed?

Answer 2

An amber ICE DETECTED

Question 3

If the anti-ice systems are ON when ice is detected, what message is displayed?

Answer 3

A cyan ICE DETECTED

Question 4

One detector has failed. What message is displayed?

Answer 4

An advisory ICE DETECTOR FAULT

Question 5

Both ice detectors have failed. What message is displayed?

Answer 5

An amber ICE DETECTOR FAIL

Question 6

How are the ice detectors tested?

Answer 6

Each detector conducts a self-check during power-up. In addition, there is continuous built-in testing.
Pilot can, also, conduct a test on the SYSTEMS TEST panel.

Question 7

What controls the operation of the wing anti-ice system.

Answer 7

Two dual channel IASC’s (Channel B) control operation and leak detection. They receive data from sensors in the inboard/outboard section of each leading edge and adjust bleed air to maintain the correct temperature range.

Question 8

What position does the wing anti-ice valve fail to?

Answer 8

Spring loaded to the closed position

Question 9

The wing anti-ice valves will close when …

Answer 9

Removal of bleed-air supply pressure
Loss of electrical power at the valve
Failure of an anti-ice duct
Operation in either FROM L or FROM R mode

Question 10

The high-pressure valves limit high-stage engine bleed pressure to …

Answer 10

36 +- 3 psi

Question 11

In the wing leading edge, how many sensing loops exist?

Answer 11

Two

Question 12

How many sensors exist in the entire wing section?

Answer 12

Four. Two inboard and two outboard.

Question 13

The outboard sensor of the wing anti-ice heat system at each section monitors …

Answer 13

Insufficient temperature. A L/R WING ANTI-ICE FAIL caution illuminates if there is insufficient heat.

Question 14

The inboard sensor of the wing anti-ice system at each section does what …

Answer 14

Provides temperature data that modulates the wing anti-ice valves.

Question 15

The inboard sensor at each section monitors …

Answer 15

The wing for overheat. L/R WING OVHT warning is displayed if the condition exists.

Question 16

The wing cross-bleed valve will automatically open if …

Answer 16

An engine failure occurs

Question 17

The IASC will automatically close both wing anti-ice valves when …

Answer 17

A WING ANTI-ICE LEAK warning occurs. If the leak stops following the automatic shutdown, the warning message is replaced with a L/R WING ANTI-ICE FAIL caution message.

Question 18

For engine anti-ice, what senses inlet temperature and supplies this information to both IASC’s?

Answer 18

The T2 sensor. It senses the engine inlet total air temperature and supplies it the IASC’s

Question 19

With regard to L/R WSHLD/WINDOW heat, what happens when wing or engine anti-ice is selected?

Answer 19

The high heat mode of the windshield heat is activated. All heat is directed to the center section of the windshield.
Also will occur if the center section is unable to maintain the proper temperature.

Question 20

The wing cross-bleed valve is normally …

Answer 20

Closed