Deice / Anti-Ice

Question 1

What checklist must be complete prior to starting the

deice/anti-ice process?

Answer 1

The Before Start Checklist.

ERJ FLIGHT DECK DEICE/ANTI-ICE 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

Should remain off. (ERJ FLIGHT DECK DEICE/ANTI-ICE CHECKLIST)

Question 4

Are there different deice procedures for Engines off vs

Engines Running?

Answer 4

Yes. (ERJ FLIGHT DECK DEICE/ANTI-ICE CHECKLIST)

Question 5

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

Answer 5

Yes. COMMUNICATION ELEMENTS TABLE

Question 6

List two required communications elements from the

COMMUNICATION ELEMENTS TABLE.

Answer 6

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

Question 7

When does the Holdover Time (HOT) begin?

Answer 7

Final application of fluid commences.

GDPM DEFINITIONS

Question 8

What does the HOT represent?

Answer 8

A range of time in which the fluid provides acceptable protection for the varying precipitation intensities. (GDPM HOT guidelines)

Question 9

In a HOT table what do the longer and shorter times

represent?

Answer 9

Heavier vs Lighter precipitation.

GDPM HOT guidelines

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 GDPM should only be used in the absence of intensities listed in the official observations.
(GDPM Precipitation intensities and types.)

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. (GDPM HOT Guidelines)

Question 12

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

Answer 12

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

GDPM HOT Guidelines

Question 14

List two precipitation types that HOTs do not exist for;

Answer 14

o Heavy snow
o Ice pellets
o Moderate and heavy freezing rain
o Hail

Question 15

When is a Pre-takeoff check conducted?

Answer 15

Within the holdover time and just prior to takeoff.

GDPM DEFINITIONS

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.
(GDPM DEFINITIONS)

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.

GDPM Pre-takeoff Procedure

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 - to ensure the wings, control surface and other critical surfaces are free of all frozen contaminants.
(GDPM DEFINITIONS and HOT Exceeded.)

Question 19

Is there ever a case where the aircraft can depart with

frozen contaminants on any of the critical surfaces?

Answer 19

No.

GDPM