Anti-Ice and Rain

Question 1

Describe the operation of the Engine Anti-Ice Switch.

Answer 1

• ON - ENG Anti-Ice Valve and PRV Commanded OPEN, allowing Bleed air to heat the engine cowl, Idle goes to Approach, Continuous ignition.
• OFF (ON not visible) - Valve is commanded closed
• VALVE Illuminated - valve disagrees with switch position.
• TAI appears on EICAS below N1 when System is ON.

Question 2

TAT Light

Answer 2

Probe is not being heated in flight.
(TAT light inhibited on ground).
(TAT Heat should be automatic, after engine start).

Question 3

What does the anti-ice and rain system include?

Answer 3

• Engine Anti-Ice
• Wing Anti-Ice
• Flight Deck Window Heat
• Windshield Wipers
• Probe Heat

Question 4

Describe the Wing Anti-Ice System.

Answer 4

• Used as De-ice (When EICAS ICING Appears)
• Used as Anti-Ice in Icing Conditions below FL220.
• BLD Air Sourced After ENG BL Valve; Before ISLN Valve.
• Inhibited on the Ground.
• Provides protection to three outboard LE slats.

Question 5

Describe Flight Deck Window Heat.

Answer 5

• Electric.
• Forward windows have Anti-Ice and Fog. ( Side- Fog only.)
• Window Heat Switch ON operates as soon as power is established.
• Automatically protected from “thermal shock.”
• Air is ducted along top of forward windows continuously.
• INOP Light indicates that a window is not being heated

Question 6

Describe Probe Heat operation.

Answer 6

• Fully Automatic.
• Heated when an engine is running, except
• TAT Fault Light is only active when airborne.
• Light indicates that a probe is not heated when commanded (in flight).

Question 7

When do we turn ENG AI ON? OFF?

Answer 7

• ON when temperature less than 10C with visible moisture or contamination present / expected, except when climbing / cruising and SAT < -40
• ON in icing conditions with power reduced, all temps.
• OFF when TAT is greater than 10C.

Question 8

CF6-80A Engine Icing Consideration

Answer 8

In icing conditions, maintain N1 above:
45%, at or above 10,000’
40%, below 10,000’