Ice Protection

Question 1

What does the WINDOW HEAT OVERHEAT (amber) light mean?

Answer 1

Overheat [62C] for the respective window

Question 2

Describe the rain removal system for the forward flight deck windows?

Answer 2

Permanent rain repellent coating [hydrophobic coating]

Windshield wipers

Question 3

What does positioning the ENG ANTI-ICE switches ON in flight do?

Answer 3

Allows engine bleed air to flow through the cowl anti ice valves

Adjusts stall warning logic [SMYD] for icing while the switches are on

Question 4

What does the COWL ANTI-ICE (amber) light mean?

Answer 4

Excessive pressure in the duct leading from the cowl anti ice valve to the cowl lip

Question 5

What does an amber TAI indication on the N1 display indicate?

Answer 5

Cowl anti-ice valve fails to move to the commanded position

Question 6

What is heated by wing anti-ice?

Answer 6

Three inboard leading edge slats from the engine

[Outboard slat and inboard leading edge flaps not heated]

Question 7

Explain WAI valves on the ground with the switch on

Answer 7

Both valves open if:
low thrust commanded, and
temp inside duct is low enough

Both valves close if:
either thrust lever is raised for takeoff, or
temp sensor detects an overheat

Question 8

How is stall warning logic affected with WAI?

Answer 8

Adjusts stick shaker and minimum maneuvering speed for the remainder of the flight

Question 9

PROBE HEAT provides electrical heat for which sensors?

Answer 9

AOA, and
TAT, and
PITOT Tubes

[Static ports are not heated]