Winter Ops

Question 1

When should engine anti-ice be turned when on the ground?

Answer 1

whenever the temperature is 10°C or less when icing conditions exist or are anticipated to exist Immediately after engine start and remain on during all ground operations.
icing conditions are defined as:
1. visible moisture with 1 mile visibility or less
2. Ice, snow, slush or standing water is present on ramps taxiways or runways

Question 2

Under what cold conditions should the aircraft not be started without maintenance intervention

Answer 2

if the engine has been cold soaked for one hour or more with a temperature below -40°C Do not start the engine! Maintenance must heat the engine before starting.

Question 3

if the ambient temperature is below -35° how long should the engines be idled before moving thrust lever position?

Answer 3

2 minutes

Question 4

is it normal to have the oil filter bypass light come on during engine start in cold weather?

Answer 4

Yes, The oil pressure may go above normal range for a couple of minutes and trigger the light.

Question 5

if oil pressure remains above the normal range even after the oil temperature has stabilized what should be done?

Answer 5

Shut down the engine. In this case allow 10 to 15 minutes to pass until trying again. This will allow the internal heat distribution of the engine to warm the oil.

Question 6

Normally generators stabilize within one minute, however in very cold weather it could take up to _______ minutes for the generators to stabilize

Answer 6

5 minutes

Question 7

Engine Runups- If OAT is 3 degrees C or below (and engine anti-ice is required) what must be done on the ground while taxing or standing?

Answer 7

Minimum 70% N1 for 30 seconds at least every 30 minutes. (if engine anti-ice is required that means that there is snow slush or standing water on the taxiways and runways)

Question 8

Run ups in freezing rain freezing fog or heavy snow

Answer 8

70 % N1 for a duration of 1 second at least every 10 minutes

Question 9

If temperature is three degrees C or below (and engine anti-ice is required) what type of takeoff?

Answer 9

Standing - hold the brakes while in position until engines are stabilized at or above 70% N1.

Question 10

What is the recommended
1. stabilizer trim position
2. Pressurization mode selector position
3. outflow valve switch position
for securing the airplane at the end of a flight in the winter time?

Answer 10

1. 4 units of trim - This prevents melting snow and ice from running into balance bay areas which can possibly freeze or lock controls
2. • pressurization mode select- manual
3. Outflow valve switch - Close

Question 11

what can happen if wing anti ice is used above 35,000 feet

Answer 11

Possible bleed trip off and loss of cabin pressure