Adverse Conditions

Question 1

Engine-Ice must be turned ON during all ground and flight operations in icing conditions. The definition of icing is:

Answer 1

OAT (on the ground and for takeoff) or TAT (inflight) is less than or equal to 10° C, and
visible moisture.
Operating on ramps, taxiways or runways where snow, ice standing water/slush, etc., may be injested in to the engines.

Question 2

When using the ALL HOT App, why is the cabin pressurization confirmed in the “AUTO” position?

Answer 2

To automatically close all external valves when the DITCHING pushbuttong is selected “ON” in step 8.
* Outflow valve
* emergency RAM air inlet
* Avionics Ventilation inlet and extract valves
* Pack Flow Control vavles
* Forward Cargo Isolation Outlet Valve

Question 3

True or False
Engine anti-ice must be on prior to and during descent in icing conditions, including temperatures below -40°C SAT?

Answer 3

True

AOM 18.5.2

Question 4

Upon the completion of the HOT App checklist, and re-accomplishing the After Start Flow and Checklist, hwne should the flaps be set for takeoff?

Answer 4

Approximately 5 minutes before takeoff because holdover times decrease once slats and flaps are extended (curved surfaces lose fluid effectivenes at a faster rate.)

Question 5

Engine run-ups must be accomplished when the OAT is at or below __°C

Answer 5

3°C OAT
See AOM Engine Runup - Taxi for details

AOM Cold Wx Ops 15.8.4