#2 Flashcards
Icing conditions
Icing conditions are prevalent between 5 C to -20 C
Rime
Forms between -10C to -20C, forms quickly creating air pockets that have rough milky appearance
Mixed
Occurs between -8C to -15C it’s a mixture of rime and clear
Clear
Most dangerous, forms slowly sometimes behind protective surfaces, forms mostly between 0C to -10C
(More water vapor means more ice which means more drag)
How to Avoid Icing
Get out of icing zones, if in icing keep speed up and use less flaps, avoid tail stalls, and wing stalls
Tail Stall fixes
Pitch up because tail is an upside down airfoil
Frost effects
Frost does not change aerodynamic flow of the wing but does cause roughness of surface and spoils smooth flow of air causing slowing of airfoil, slowing of the air causes early air flow separation over airfoil resulting in loss of lift this increases stall speed, small amount of frost can stop aircraft from taking off at normal takeoff speed
FAA rule on ice/frost on wings
Wing must be completely clear of containment’s prior to flight
Radar Summary Chart
Depicts precipitation type, intensity, coverage, movement, echoes, and max tops. Issued hourly
Low level significant weather chart
Forecasts significant weather conditions for 12 and 24 period from SFC to 24,000 MSL. Issued 4 times a day. Depicts (IFR, MVFR, VFR) turbulence and freezing levels