Ice and Rain Protection

Question 1

Source of Engine Anti-Ice

Answer 1

• Hot Air from low pressure stage of respective engine bleed to engine cowl

Question 2

Source of Wing Anti Ice

Answer 2

• Hot air from respective engine side heat 3 outboard leading edges
• Can be sourced from opposite engine via XBLEED if on side source fails
• APU Bleed Air CANNOT be used

Question 3

Systems electrically heated to prevent ice

Answer 3

• pitot and static port heating systems
• windshield anti-ice system
• water lines heating system

Question 4

What happens to anti-ice valve if electrical or pressure signal is lost

Answer 4

• engine anti-ice valves fail safe open

Question 5

Single or Dual ice detector failure

Answer 5

Single failure - remaining detector is still automatic

Dual failure - anti-ice operation is only possible in the manual mode.

Question 6

Logic operation of REF A/I Modes with mode selector in AUTO

Answer 6

Off - engine and wing anti-ice valves will open if ice is detected at 1700’ or 2 mins after takeoff

ENG - eng anti-ice valves open after engine start; wing anti-ice valves will open if ice detected at 1700’ or 2 mins after takeoff

All - eng anti-ice valves open after engine start, wing anti-ice valves will open above 40 knts

Question 7

How long do the anti-ice valves remain open and active after ice is no longer detected

Answer 7

5 mins

Question 8

When does window heat automatically turn on

Answer 8

With at least 2 AC sources

* in flight with single AC source only Left window is heated (right will be heated if left fails)

Question 9

Automatic heating of air data probes

Answer 9

• engine running, or

- aircraft airborne

Question 10

When is wing anti-ice automatically tested

Answer 10

• 10 mins after takeoff, or
• 10,000’

*test duration is max 60s