Cold Weather Operations

Question 1

Is takeoff with cold soaked fuel frost ever permitted? What conditions must be met?

Answer 1

Yes. the conditions are (and must all be met):

• ambient temp above 4 C
• no precip or visible moisture
• tank temp at or above -16C
• all LE devices, control surfaces, tab surfaces, winglet, control surface balance panel cavities must be free of snow, ice, frost
• frost less than 1/8 in

Question 2

Can you use reduced thrust (fix derate, ATM, or both) on wet runways?

Answer 2

Yes, provided suitable takeoff performance is made for the increased stopping distance on wet runways

Question 3

If a runway is contaminated by slush, snow, standing water, or ice, can you use any reduced thrust method (fix derate, ATM, or both)?

Answer 3

ONLY fixed derate is allowed provided the takeoff performance accounts for the runway surface conditions

Question 4

Takeoffs are NOT recommended when slush, wet snow, or standing water depth is more than __ inch or dry snow depth is more than __in

Answer 4

1/2 inch

4 inches

Question 5

When are icing conditions on the ground present? In flight?

Answer 5

On the ground when OAT is 10 C or below or in flight when TAT is 10 C or below and the following conditions are met:
- visisble moisture (clouds, vis of 1SM or less, rain snow sleet ice crystals, etc)
OR
-ice, snow, slush, or standing water present on ramps, taxiways, runways

Question 6

If you will be using engine anti-ice on the ground, when should you turn it on?

Answer 6

After both engines are started and should remain on for all ground operations when icing condition exist or are anticipated

Question 7

When should you use wing anti ice on the ground? when shouldn’t you?

Answer 7

Use wing anti ice during all ground operations between engine start and takeoff when icing conditions exist or are anticipated. DO NOT USE if the airplane will be protected by TYPE II or TYPE IV fluid

Question 8

When engine anti ice is required and OAT is __ degrees C or below, an engine runup is recommended to minimize ice build up during taxi

Answer 8

3 C

Question 9

When engine anti ice is required and OAT is _ degrees C or below, the takeoff must be preceded by a static engine runup (a minimum of 70% N1 and confirm stable engine operations. 30 sec recommended when possible)

Answer 9

3 C

Question 10

When do you NOT have to use engine anti ice in flight when icing conditions exist?

Answer 10

During climb and cruise when temp is below -40 C SAT. Does not apply to descent

Question 11

What are items to consider when determining whether to implement Deicing/anti icing procedures

Answer 11

• frost or precip occuring?
• anytime OAT is below 10 C and visible moisture
• contaminated taxiways with near freezing temps
• light freezing rain or drizzle conditions
• forecasts?

Question 12

In relation to aircraft contamination what is the pre-takeoff check?

Answer 12

the check that the aircraft and surfaces are free or frozen contaminants. Conducted within the holdover time and is required if any precipitation has occurred from the time anti-ice/de-ice has occurred and until the aircraft departs

Question 13

in relation to aircraft contamination, what is the pre-takeoff contamination check?

Answer 13

required if the holdover time has passed and it is to ensure that the critical surfaces of the a/c are free of frozen contaminants. Must happen within 5 minutes of beginning takeoff

Question 14

When checking the aircraft on a pre-takeoff contamination check, what should you look for?

Answer 14

• look for white patches
• loss of glossiness to fluid
• surfaces turning opaque
• snow flakes remaining on surface
• clear ice
• any questions about the surface which would require you to go touch it

Question 15

When does hold over time for anti-icing begin?

Answer 15

HOT begins when the final application of anti-icing fluid commences