Ice & Rain Protection

Question 1

What areas of the CRJ-700 are protected against ice accretion?

Answer 1

• The wing leading edges
• The engine cowls
• Windshields and Side Windows
• The Air Data Probes

Question 2

What provides ice protection for the wing leading edges and engine cowling areas?

Answer 2

Engine bleed air

Question 3

What occurs to the N2 gauges when the wing anti-icing is selected?

Answer 3

White arcs are displayed on the N2 gauge between 0%-77%. The arcs remind the pilots that N2 core speed should be kept at a high rpm when the wing anti-ice is on to ensure an adequate flow of bleed air from the engine.

Question 4

How many ice detectors are installed on the CRJ-700?

Answer 4

Two

Question 5

How does the ice detector provide ice accretion information to the cockpit?

Answer 5

Either an ICE caution message or an ICE advisory message

Question 6

What does an amber “ICE” caution message indicate to the pilots?

Answer 6

The ice detectors have detected ice and the wing and cowl anti-ice systems are not selected on.

Question 7

What does a green “ICE” advisory message indicate to the pilots?

Answer 7

The ice detectors have detected ice or are still detecting ice and the wing and cowl anti-ice systems are selected on

Question 8

Where does the left wing anti-icing system normally receive bleed air?

Answer 8

The left engine

Question 9

Where does the right wing anti-ice system normally receive bleed air?

Answer 9

The right engine

Question 10

What is the function of the Wing Anti-Ice Cross Bleed rotary switch on the Bleed Air Control Panel?

Answer 10

It allows the pilot to select both or either engine as the source of anti-icing bleed air.

Question 11

Why is the bleed air output increased when the slats are extended?

Answer 11

When the slats are extended, the wing leading edge is maintained at a higher temperature.

Question 12

What is the function of the anti-ice system piccolo tubes located in the inner surface of the leading edges?

Answer 12

To allow for the uniform spraying of hot bleed air onto the inner surfaces of the leading edges of the wings

Question 13

How is the hot bleed air routed to the slats from the piccolo tubes?

Answer 13

Via a telescopic duct to slat #1 and then span wise to slats 2 and 3.

Question 14

What occurs after a wing overheat is detected?

Answer 14

• The associated anti-icing valve is automatically closed
• The red WING OVHT warning is displayed on the Primary page
• The overheated wing leading edge is displayed in red on the Ant-Ice synoptic page

Question 15

What is the function of the FROM LEFT position of the Wing Anti-Ice Cross Bleed selector located on the Bleed Air Control Panel?

Answer 15

This position closes the right wing anti-icing valve and allows both wings to be anti-iced with bleed air from only the left engine.

Question 16

What is the function of the NORMAL position of the Wing Anti-Ice Cross Bleed selector located on the Bleed Air Control Panel?

Answer 16

The left wing leading edge is anti-iced with bleed air from the left engine and the right wing leading edge is anti-iced with bleed air from the right engine.

Question 17

What is the function of the FROM RIGHT position of the Wing Anti-Ice Cross Bleed selector located on the Bleed Air Control Panel?

Answer 17

This position closes the left wing anti-icing valve and allows both wings to be anti-iced with bleed air from only the right engine

Question 18

How are the air data probes protected against ice accretion?

Answer 18

They are electrically heated

Question 19

What occurs to the pitot heaters when an engine generator is operating and the probe switches are off during ground operations?

Answer 19

Half power is applied to the pitot heads

Question 20

What will occur to the pitot heaters when an engine generator is operating and the probe switches are on during ground operations?

Answer 20

• Half power is applied to the pitot heads
• Full power is applied to the static ports and AOA sensors

Question 21

What will occur if APU or external power is applied to the aircraft with the probes switches in the OFF position during ground operations?

Answer 21

Nothing is heated

Question 22

What will occur if APU or external power is applied to the aircraft with the probe switches in the ON position during ground operations?

Answer 22

• Half power is applied to the pitot heads
• Full power is applied to the static ports and AOA vanes

Question 23

What function will the Air Data Sensor Heater Controller (ADSDC) perform after takeoff regardless of probe or generator switch position?

Answer 23

Full power is applied to all pitot tubes, static ports, AOA vanes, and the TAT probe

Question 24

What is the function of the LOW position of the Windshield / Window Heater switch?

Answer 24

To heat the side windows and windshields at a low temperature setting for de-fogging and de-misting

Question 25

What is the function of the HI position of the Windshield / Window Heater switch?

Answer 25

To apply a higher temperature setting to the windshields to shed ice accumulations

Question 26

What will occur if the WSHLD Heat switch is brought from the OFF to the HI position during ground operations?

Answer 26

A normal warm-up cycle is first completed and then the windshields are heated to a higher temperature

Question 27

What three separate functions does the Ice DET TEST switchlight perform?

Answer 27

1. Icing Indicator
2. Ice Detection System testing
3. ADSHC System testing

Question 28

What is a functional ice detection system test if the leading edges are cool (below 19 degrees c)?

Answer 28

• Amber ICE switchlight is illuminated
• Amber ICE caution message appears on the Primary page
• ADS HEAT TEST OK green Advisory message id displayed on the Status page

Question 29

What message will appear during an ice detection system test if the leading edges have a raised temperature do to ambient conditions (above 19 degrees c)?

Answer 29

• Green ICE Advisory message appears on the Status page
• ADS HEAT TEST OK green Advisory message id displayed on the Status page