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=== Clear Ice === | === Clear Ice === | ||
Clear ice is formed in dense cloud or freezing rain from 0°C to -10°C. It is spread unevenly due to the droplet spreading out before it freezes. The wing shape becomes altered, decreasing lift and increasing drag from 300% to 500%. | Clear ice is formed in dense cloud or freezing rain from 0°C to -10°C. It is spread unevenly due to the droplet spreading out before it freezes. The wing shape becomes altered, decreasing lift and increasing drag from 300% to 500%. The best conditions for clear ice are [[Clouds#cumulus|cumulus]] clouds, large super-cooled water droplets, and a high catch rate. | ||
==Severity== | |||
Light — The rate of accumulation may create a problem if flight is prolonged in this environment. | |||
Moderate — The rate of accumulation is such that even short encounters become potentially hazardous, and use of de-icing equipment or diversion is required. | |||
Severe — The rate of accumulation is such that de-icing or anti-icing equipment fails to reduce or control the hazard. Immediate diversion is necessary.<br /> | |||
Ref: <ref>[http://www.tc.gc.ca/civilaviation/systemsafety/pubs/TP2228/PIREP.htm TP2228]</ref> | |||
=References= | |||
<references /> | |||
Latest revision as of 12:21, 3 March 2009
Icing
Types
Rime Ice
Rime ice forms on the leading edges of the wings from -10°C to -20°C.
Clear Ice
Clear ice is formed in dense cloud or freezing rain from 0°C to -10°C. It is spread unevenly due to the droplet spreading out before it freezes. The wing shape becomes altered, decreasing lift and increasing drag from 300% to 500%. The best conditions for clear ice are cumulus clouds, large super-cooled water droplets, and a high catch rate.
Severity
Light — The rate of accumulation may create a problem if flight is prolonged in this environment.
Moderate — The rate of accumulation is such that even short encounters become potentially hazardous, and use of de-icing equipment or diversion is required.
Severe — The rate of accumulation is such that de-icing or anti-icing equipment fails to reduce or control the hazard. Immediate diversion is necessary.
Ref: [1]
