Cold weather ops

Question 1

Icing and freezing conditions

Answer 1

Icing conditions exist when OAT (on the ground) or TAT (in flight) is 10°C

Freezing conditions exist on the ground when the OAT is +3°C or below and any of the following exist: * visible moisture (clouds, fog with visibility of one statute mile (1600m) or less, rain, snow, sleet, ice crystals, and so on) is present, or * ice, snow, slush or standing water is present on the ramps, taxiways, or runways.

Question 2

Probe Heats

Answer 2

In freezing conditions do the following step during the normal Preflight Procedure - Pilot Flying:

PROBE HEAT switches………………………………………………….. ON

Question 3

ENG anti ice

Answer 3

Engine anti-ice must be selected ON immediately after both engines are started and remain on during all ground operations when icing conditions exist or are anticipated.

Question 4

ENG run up

Answer 4

When engine anti-ice is required and the OAT is 3°C or below, an engine run up is recommended to minimize ice build-up. Use the following procedure: Check that the area behind the airplane is clear. Run-up to a minimum of 70% N1 for approximately 30 seconds duration at intervals no greater than 30 minutes.

When operating in conditions of freezing rain, freezing drizzle, freezing fog or heavy snow, run-ups to a minimum of 70% N1 for approximately 1 second duration at intervals no greater than 10 minutes enhance ice shedding.

Question 5

APU during de-icing

Answer 5

The APU should be shut down unless APU operation is necessary.

Question 6

TO procedure

Answer 6

When engine anti-ice is required and the OAT is 3°C or below, the takeoff must be preceded by a static engine run-up. Use the following procedure:

Run-up to a minimum of 70% N1 and confirm stable engine operation before the start of the takeoff roll. A 30-second run-up is highly recommended whenever possible.

Question 7

Fan Ice removal

Answer 7

ENGINE START switches (both) …………………………………….FLT

Autothrottle (if engaged) ………………………………………..Disengage

Thrust ……………………………………………………………………. Increase Increase thrust to a minimum of 80% N1 for approximately 1 second to ensure the fan blades and spinner are clear of ice.

Thrust ………………………….Reduce as needed for flight conditions Wait 15 seconds. This allows engine vibration level to stabilize.

Question 8

After landing

Answer 8

Do not retract the flaps to less than flaps 15 until the flap areas have been checked to be free of contaminants.

Stabilizer trim …………………………………………Set 5 units

Question 9

Minimum RWY Braking action?

Answer 9

Poor or NIL prohibited

Question 10

Landing guidelines contaminated RWY

Answer 10

• Flap 40 landing
• Theshold at 50ft
• Touchdown at aiming point
• Autobrake MAX
• Max reverse

Question 11

Max allowable fros CSFF?

Answer 11

1.5mm inside the area of CSFF