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Icing (Supercooled water (Supercooled is unstable liquid below 0 degrees,…
Icing
Supercooled water
Supercooled is unstable liquid below 0 degrees
When they are solid, they are in a stable state
Latent heat of fusion is given off from liquid changing to ice and vice versa
Types of Ice
Airframe icing
Clear ice
Hard to dislodge
0 - -15 degrees temp
Flying in cumulous cloud
Rime ice
colder than -15
Porous and brittle
Irregular shape. Upsets aerodynamics
Hoar frost
formed through deposition
frosty night. aircraft parked outside
No bucket of water
Freezing rain
Water falls from warm to below FZL
Can produce clear ice
Engine icing
Carburettor icing
Intake icing
Influential Factors
High Water content in cloud
Aircraft characteristics
Sharp points gather ice more readily
Higher speed (below 250kts) accumulates ice faster
Skin friction over 250kts reduces ice
Engine icing
Carburettor
Loss in pressure = drop in temperature
Throttle icing - freezing of throttle butterfly
Ice formed in fuel tank is referred to as refrigeration icing
Loss of RPM and rough running
Engine intake ice
Alt air supply
slightly reduced manifold pressure
Water in solid form