Icing Flashcards
The holdover tables reveal a timing range for different contaminants (ie 30 to 45 minutes). What are the shorter and longer times appropriate for?
The shorter HOT is for moderate precipitation and the longer HOT is for light precipitation.
After a landing and taxi, in dry snow conditions with an OAT of -20 degrees, is it necessary to use engine anti ice?
Engine anti ice must be used during all ground and flight operations when icing conditions exist or are anticipated.
What are the takeoff limitations for ice and snow on the leading edges, control surfaces, and upper wing?
Free of Ice and snow.
The shorter HOT has been exceeded, but not the longer HOT, and precipitation is present. What action in required?
A pre-takeoff contamination inspection. (Visual inspection from cabin of the effectiveness of the anti-icing fluid on the critical surfaces within 5 minutes prior to the takeoff roll).
What Holdover time is available if +SN conditions exist or are forecast for takeoff?
No HOT guidelines exist for heavy snow.
Having decided to leave Flaps up during taxi out for slush and/or standing water conditions, what would you do differently with regard to checklist management?
Wait until Flaps reach takeoff configuration before calling for “before takeoff checklist”
What are the take off limitations for ice and snow on the underside of the wing?
A light coating of frost up to 3mm on the underside of the wing fuel tank.
The longer HOT has been exceeded and precipitation is present. What action is required?
A pre take off contamination inspection (from the cabin) and and pre takeoff contamination check (external check) must be completed within 5 minutes prior to the take off roll.
When does Hold Over Timing begin?
HOT timing begins with the commencement of the final application of anti icing fluid.
What precautions should be taken during taxi out or after landing through slush or standing water?
Taxi out with Flaps up.
Do not retract Flaps after landing until a visual inspection is accomplished. (Notify ATC as this may be a sign for hijacking).
Are snow, ice or frost permitted on the fuselage?
Only thin hoarfrost is permitted on the upper surface of the fuselage provided all vents and ports are clear of frost.
