ANTI ICE PANEL-odd

Question 1

What is accomplished if the WING anti ice pushbutton is selected ON while the aircraft is on the ground?

Answer 1

The system will self-test for 30 seconds, and then the valves will close until the aircraft is airborne.

Question 2

What does the WING FAULT light illumination on the ANTI ICE panel indicate?

Answer 2

• Valve disagreement. (comes on momentarily when valve in transit)
• Low pressure

Question 3

What does the ENG 1(2) FAULT light illumination on the ANTI ICE panel indicate?

Answer 3

Valve disagreement (comes on momentarily when valve in transit)

Question 4

After selecting the probe/window heat pb on the ground to remove ice or fog on the window. Would the pilot need to
select it off before T/O?

Answer 4

Yes, so it can operate in the automatic mode.

Question 5

What part of the wing is heated?

Answer 5

Outboard 3 slats.

Question 6

What is the significance of high swept wings versus less swept wings in ice
accumulation?

Answer 6

The more swept the wing, the less time for the moisture to attach.

Question 7

In what position do the WING and ENGINE anti ice valves fail if electrical
power is lost?

Answer 7

• Wing – valves CLOSE

* Engine – valves OPEN

Question 8

A flight crew is arriving to the aircraft in DTW early in the morning and notice
that cockpit windows are frosted over. What should the flight crew do?

Answer 8

Select the PROBE/WINDOW HEAT on. This must be selected off prior to
takeoff in order to regain normal system logic.

Question 9

The temperature outside is 2°C with visible moisture. What should the flight
crew turn on?

Answer 9

ENG anti ice after engine start.

Question 10

After takeoff, when should the flight crew turn on the WING anti ice?

Answer 10

WING anti ice can be used after the aircraft is in a clean wing and when
conditions warrant its use.

Question 11

Climbing through FL240 in visible moisture, the crew notices the TAT is -
22°C and the SAT is -45°C. What would be appropriate use of the ENG anti
ice?

Answer 11

• Engine anti ice may be turned OFF in this scenario. Engine anti ice is
required when icing conditions exist or are expected except during climb or
cruise when the SAT is below -40°C.

Question 12

Starting a descent out of FL350 with visible moisture, the TAT is -32°C and
SAT is -53°C, what would be appropriate use of the ENG anti ice?

Answer 12

Engine anti-ice must be ON during the descent in icing conditions even if
SAT is below -40°C.

Question 13

Descending through 10,000ft, the pilots notice ice accumulation on the
cockpit windshield blades. What should they do?

Answer 13

Turn on the WING anti ice. WING anti ice may either be used to prevent or
remove ice accumulation from the wing leading edges. After takeoff, WING
anti ice can be used after the aircraft is in a clean wing configuration. Ice
accumulation can be detected by observing the ice indicator located
between the two cockpit windshields or by observing the windshield wipers
blades.

Question 14

Can the WING anti ice be used on the approach and landing?

Answer 14

Yes, but it should only be considered in severe icing because second
segment climb performance could be affected if a go-around is performed.

Question 15

What is TAT?

Answer 15

• Total Air Temperature is also called Indicated Air Temperature (IAT) or Ram 
Air Temperature (RAT)

Question 16

What is SAT?

Answer 16

Static Air Temperature is also called: Outside Air Temperature (OAT) or
True Air Temperature

Question 17

Should a flight crew use TAT or SAT when determining whether to turn anti
ice systems on?

Answer 17

• Remember TAT indicates when to turn anti ice ON. SAT indicates when it
may be able to be turned OFF.