Deice/Anti-Ice Flashcards
What temperature determines icing conditions?
10* C or below when operating in visible moisture.
Ramp conditions with slush, snow, ice etc.
When is MCDU set to ENG?
With an OAT between 10 and 5C with visible moisture up to 1700 ft
Engine anti ice vales will open with engine start.
When is MCDU set to ALL?
Below 5C and visible moisture up to 1700 ft
Engine valves open on engine start
Wing valves open with wheel speed above 40kt
How does the windshield heat work?
Button in for automatic operation.
Only operates with 2 AC sources
On the ground with 1 AC source, each windshield heats for 120 sec for its standard power up PBIT
In the air with 1 AC source, captains side is heated. If failed, switches to FO side.
What is the cold weather inspection and when does it need to be performed?
Inspection to determine if the wings are free of frozen contaminants.
Must be done when…..
- OAT is 5C or less.
- Wing fuel temp is 0C or less.
- Atmospheric consisting conducive to icing are present.
- Aircraft on a RON and may be contaminated.
- When ice could accumulate on the aircraft during approach or landing.
- Cold soak suspected in the fuel tank.
What are the effects of cold fuel in the tanks?
Clear Ice is likely to form the upper surface of the wings when the dew point is close. (Within 3 degrees)
Frost can also form on the upper/lower surface of the wing with temps significantly above freezing
What is a pre-takeoff check?
A check of the essential surfaces for any frozen contaminants after deicing and prior to takeoff. Performed from inside the aircraft.
What is a pre-takeoff contamination check?
Check done when the pre-takeoff check cannot be effectively completed.
Completed within 5 minutes prior to takeoff from outside the plane and performed by trained personnel.
What are the preflight requirements for the ADSP probes?
Verify condition. No obstructions, contaminants, damage, covers or deice fluid if the aircraft what’s decide prior to crew arrival.
How do you deice the ADSPs?
Turn the heater on. Once an engine is on they will be heated.
Must be turned on when OAT is at or below freezing and ice/snow is suspected.
Turn off after engine start.
How do you recognize the ADSP probes may be blocked?
Undesired airspeed indication during power up.
EICAS messages of AFCS fault, AT fail, AP fail, FD fail, appr 2 not avail.
Is frost permitted?
Frost is not permitted on the upper surface areas of the wings and tail.
Fuselage: allowed as long as surface features can be distinguished.
Under the wings: 1/8” or 3mm permitted.
What do you do if holdover time is exceeded?
A pre takeoff contamination check has to be completed prior to takeoff. If there are any contaminants, you must return for more deice.
When are flaps extended if deicing is planned?
When the captain calls for them.
Flaps stay up for deicing. Trim full nice down.
Follow the deicing checklists.
