Winter Ops

Question 1

How much frost is permitted on the underside of the wing?

Answer 1

1/8”

Question 2

When must a cold weather preflight be performed?

Answer 2

OAT 5° C or less
Wing fuel temp 0°C or less
Atmospheric conditions conducive to icing
A/c parked overnight and may have been exposed to frost/ precip. Etc..
Any through flight where residual ice may be present
Cold soak ice suspected in fuel tank areas

Question 3

What should you do if taxiing in icing conditions for >30min or fan vibration is detected?

Answer 3

Set N1 to 54% for 30 seconds or until fan vibration is normal

Question 4

What do you do if you suspect ice accretion on fan blades in flight?

Answer 4

Reduce one thrust lever at a time towards idle then advance to a minimum of 70% N1 for 10-30 seconds

Question 5

What auto brake setting is used for contaminated runways?

Answer 5

Medium