Ice and Rain protection

Question 1

From which ebg part is bleed air for anti ice taken

Answer 1

Compressorn4 and 6 stages

Question 2

how the ice detectors work when anti ice is on or auto?

Answer 2

If either ice detector senses ice accumulation, a signal is sent to the Integrated Air System Controller (IASC) to open the wing anti-ice valves and to the Full Authority Digital Engine Control (FADEC) to open the Cowl Anti-Ice Valves (CAIVs)

A signal is also sent to the Fly-By-Wire (FBW) system to adjust the stall warning parameters.

Question 3

How long ICE advisory stays on after ice is detected?

Answer 3

1 min

Question 4

How long antiice system will remain on after ICE advisory is gone?

Answer 4

2 mins

Question 5

At what point does the WAI system activates after takeoff when set to AUTO?

Answer 5

At 1500ft or 2 mins after takeoff

Question 6

Until what altitude is cowl anti ice inhibited if selected AUTO?

Answer 6

When selected auto, it is inhibited during takeoff up to 1500ft or 2 mins

Question 7

When is WAI inhibited?

Answer 7

On ground below 60kts except when testing

Question 8

Are the leading edge inner slats deiced?

Answer 8

No, they do not accumulate a lot of icing

Question 9

What is IASC and what does it do?

Answer 9

Integrated Air System Controller. Two Integrated Air System Controllers (IASCs) manage and control all the aircraft bleed valves. Each IASC has three channels: A channel, B channel, and a safety channel C (refer to Figure 02−02−8).Channels A and B alternate control on a daily basis

Question 10

How do ice detector probes work?

Answer 10

The sensing element in the ice detector probe is an electrical oscillator that vibrates at a specific frequency. Ice on the sensing element is detected by a change in the vibration frequency of the oscillator. When ice is detected, the sensing element momentarily heats up to de-ice.

Question 11

When does amber ICE displays on EICAS?

Answer 11

When ICE is detected but WAI is off

Question 12

Which stage engine compressor bleed air is used by cowl anti ice?

Answer 12

6th stage

Question 13

How many anti ice Cowl temperature sensors each engine has?

Answer 13

2 sesnsors each engine

Question 14

When are all air data probes and sensors heated?

Answer 14

With weights off wheels is sensed and when engine is running. Theyy modulate below 55kt and on all the time above 55 kt

Question 15

When are angle of attack vanes heated?

Answer 15

Whenever AC has ground, APU, battery (any electrical power) or engine power

Question 16

Where are air data computers located?

Answer 16

At the base of each ADS probe

Question 17

When are P2T2 probes heated?

Answer 17

Whenever any engine is running

Question 18

With AUTO selected, what controls the Cowl anti ice system?

Answer 18

Ice detection system and EECU

Question 19

How odes each air date probe look?

Answer 19

Question 20

How many heating elements are in each Window?

Answer 20

3

Question 21

What happens when the aircraft is on the ground and the PROBE HEAT switch/light on the overhead panel is pressed? (select three responses).

Answer 21

The ADS PROBE HEAT GND ON status message displays on the EICAS
The GND ON legend illuminates
Air data system probes (ADSPs) and total air temperature (TAT) probes heat turns on

Question 22

What is the purpose of the sensing probe in the ice detection system? (Select two responses.)

Answer 22

Monitors the ice on the probes
Detects a change in vibration frequency

Question 23

The fan inlet cone and cover are de-iced using 6th stage engine bleed air.

Answer 23

False ? From able test