Perform Deice/Anti-Ice Procedures

Question 1

What checklist must be completed prior to starting the deice/anti-ice process?

Answer 1

The Before Start Checklist.

Question 2

What is used in lieu of Normal Procedures Checklist from the start of the deice/anti-ice process through the Before Takeoff Checklist?

Answer 2

ERJ Flight Deck Deice/Anti-Ice Checklist

Question 3

What is the guidance the checklist provides regarding running the APU during deicing procedures?

Answer 3

It should remain off.

Question 4

Are there different deice procedures for Engines Off versus Engines Running?

Answer 4

Yes.

Question 5

Are the Deice/Anti-Ice Communication Elements required? Where are they found?

Answer 5

Yes, Communication Elements Table in the GDPM. Located in the Weather tab of Company Manuals.

Question 6

List two required communications elements from the Communications Elements Table.

Answer 6

• Type of fluid to be used.
• Percentage of fluid.
• Time of beginning of final deice step.
• Deicing complete.

Question 7

When does the Holdover Time (HOT) begin?

Answer 7

Final application of fluid commences.

Question 8

What does the HOT represent?

Answer 8

A range of time in which the fluid provides acceptable protection for the varying precipitation intesnsities.

Question 9

In a HOT table, what do the longer and shorter times represent?

Answer 9

Heavier versus lighter precipitation intensities.

Question 10

What should a crew use to determine precipitation intensities in order to accurately establish a HOT?

Answer 10

Official weather observations. Tables from the Ground Deicing Procedures Manual (GDPM) should only be used in the absence of intensities listed in the official observations.

Question 11

Can the HOT be used as the sole determinant that aircraft critical surfaces are free of frozen contaminants?

Answer 11

No, several pre-takeoff checks may be required to determine the condition of the aircraft prior to takeoff.

Question 12

What are two factors that influence the effectiveness of deicing/anti-icing fluid?

Answer 12

• Change in precipitation type, intensity, and moisture content.
• Change in ambient and aircraft skin temperature.
• Position of aircraft relative to the exhaust or prop wash of other aircraft.
• Change in wind direction or velocity.

Question 13

Can parking in the proximity of another aircraft’s jet wash blow the deice/anti-ice fluid off the wings rendering the HOT invalid or the fluid ineffective?

Answer 13

Yes.

Question 14

List two precipitation types that HOTs do not exist for.

Answer 14

• Heavy Snow
• Ice Pellets
• Moderate and Heavy Freezing Rain
• Hail

Question 15

When is a Pre-Takeoff check conducted?

Answer 15

Within the holdover time and just prior to takeoff.

Question 16

What is checked as part of the Pre-Takeoff check?

Answer 16

The representative surface from a vantage point in the aircraft that the PIC determines will give an accurate indication of the condition of the aircraft.

Question 17

What should the crew do if they are unable to determine that the representative surface is free from frozen contaminants?

Answer 17

The aircraft must be deiced again.

Question 18

When is a Pre-Takeoff Contamination check conducted?

Answer 18

After the HOT has been exceeded or the HOT is no longer valid due to changing weather conditions, or in heavy snow. This is to ensure the wings, control surfaces, and other critical surfaces are free of all frozen contaminants.

Question 19

Can the Pre-Takeoff Contamination check be performed if the deicing process was initiated at a location other than the wings, for instance, the tail?

Answer 19

No.

Question 20

Is there ever a case where the aircraft can depart with frozen contaminants on any of the critical surfaces?

Answer 20

No.