Icing Flashcards
When does active frost form
Frost will form on an unprotected surface, or re-form on a surface protected with de/anti-icing fluid when the holdover time has expired
Definition of anti-icing
It is a procedure in which an Aircraft Anti-Ice Fluid (AAF) is supplied to a surface free of frozen contaminants for a limited period of time
What is clear ice
Clear ice is a coating of ice, generally clear and smooth, but with some air pockets. It is formed on exposed objects at temperatures below, or slightly above freezing temperature, with freezing of super-cooled drizzle, droplets or raindrops.
Definition of de-icing
De-icing is a procedure by which frost, ice, snow or slush is removed from an aircraft by use of a heated Aircraft De-Icing fluid (ADF), to provide surfaces free of contamination.
Definition of icing condition
When OAT on ground, or TAT in flight is at or below +10°C and there is visible moisture in the air, such as clouds, rain, ice crystals or fog with a visibility of 1 mile or less, or there is standing water, slush, ice or snow present on the taxiways or the runway.
When shall engine anti ice be selected on
When in icing conditions and temp is between +10°C to -40°C in climb and cruise, and anytime the temp is lower than +10°C in descent
What is the minimum speed in extended icing conditions
VLS +15 kt in clean configuration, or VLS +5 kt
How much shall landing distance be increased with in extended icing conditions
Multiply landing distance with 1.1
When is FAN ICE SHEDDING procedure required
When on ground in icing conditions with NO freezing fog in temp of +3C or below
Describe the FAN ICE SHEDDING procedure
Increase N1 to 50% for 10 sec for every hour on the ground, and before takeoff
What is required if freezing fog is present
Apply the CORE ICE SHEDDING procedure
Describe the ICE CORE SHEDDING procedure
Increase
What is the maximum cumulative taxi time in freezing fog
45 min
What action need to be taken after taxi in freezing fog
Write up total taxi time in the tech log
If taxing out for departure in freezing fog, and the taxi time is less than 45 min, is an log book entry required
No