DEFINITIONS PAGE 0-7
representative surface) are free of all frozen contaminants. The initial HOT must be at least 20 minutes long and this check must be completed within 5 minutes before the commencement of the take off role. It is conducted from within the aircraft.
Rain and snow- precipitation in the form of a mixture of rain and snow.
Representative surface -an aircraft surface that can be clearly observed by flight crew from inside the aircraft for judging whether or not critical surfaces are contaminated. Its condition will fairly represent the worst condition of all critical surfaces. This will typically be the wing leading edge in conjunction with the trailing edge.
Snow -precipitation of ice crystals, most of which are star-shaped or mixed with un-branched crystals. At temperatures higher than -5 C the crystals are generally agglomerated into snowflakes.
Snow grains -precipitation of very small white and opaque particles of ice that are fairly flat or elongated with a diameter of less than 1 mm. When snow grains hit hard ground, they do not bounce or shatter.
Snow pellets -precipitation of white opaque particles of ice. The particles are round or sometimes conical; their diameter ranges from about 2-5 mm. snow pellets are brittle, easily crushed; they do bounce and may break on hard ground.
Slush -snow or ice that has been reduced to a soft watery mixture.
Two-Step De-icing/Anti-icing -This procedure contains two different steps. The first step, de-icing, is followed by the second step, anti-icing, as a separate fluid application. After de-icing, a separate overspray of anti-icing fluid is applied to protect the aeroplane’s critical surfaces, thus providing maximum anti-icing protection.
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