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Intercycle Ice  Ice which accumulates on a protected surface between actuation cycles of a deicing system. 
Known or Observed or Detected Ice Accretion  Actual ice observed visually to be on the aircraft by the flight crew or identified by on.board sensors. 
Mixed Ice  Simultaneous appearance or a combination of rime and glaze ice characteristics. Since the clarity, color, and shape of the ice will be a mixture of rime and glaze characteristics, accurate identification of mixed ice from the cockpit may be difficult. 
Residual Ice  Ice which remains on a protected surface immediately after the actuation of a deicing system. 
Rime Ice  A rough, milky, opaque ice formed by the rapid freezing of supercooled drops/droplets after they strike the aircraft. The rapid freezing results in air being trapped, giving the ice its opaque appearance and making it porous and brittle. Rime ice typically accretes along the stagnation line of an airfoil and is more regular in shape and conformal to the airfoil than glaze ice. It is the ice shape, rather than the clarity or color of the ice, which is most likely to be accurately assessed from the cockpit. 
Runback Ice  Ice which forms from the freezing or refreezing of water leaving protected surfaces and running back to unprotected surfaces. 
Note. Ice types are difficult for the pilot to discern and have uncertain effects on an airplane in flight. Ice type definitions will be included in the AIP for use in the “Remarks” section of the PIREP and for use in forecasting. 

TBL GEN 3.5.10
Icing Conditions
Appendix C Icing Conditions  Appendix C (14 CFR, Part 25 and 29) is the certification icing condition standard for approving ice protection provisions on aircraft. The conditions are specified in terms of altitude, temperature, liquid water content (LWC), representative droplet size (mean effective drop diameter [MED]), and cloud horizontal extent. 
Forecast Icing Conditions  Environmental conditions expected by a National Weather Service or an FAA.approved weather provider to be conducive to the formation of inflight icing on aircraft. 
Freezing Drizzle (FZDZ)  Drizzle is precipitation at ground level or aloft in the form of liquid water drops which have diameters less than 0.5 mm and greater than 0.05 mm.  Freezing drizzle is drizzle that exists at air temperatures less than 00C (supercooled), remains in liquid form, and freezes upon contact with objects on the surface or airborne. 
Freezing Precipitation  Freezing precipitation is freezing rain or freezing drizzle falling through or outside of visible cloud. 
Freezing Rain (FZRA)  Rain is precipitation at ground level or aloft in the form of liquid water drops which have diameters greater than 0.5 mm. Freezing rain is rain that exists at air temperatures less than 00C (supercooled), remains in liquid form, and freezes upon contact with objects on the ground or in the air. 
Icing in Cloud  Icing occurring within visible cloud. Cloud droplets (diameter < 0.05 mm) will be present; freezing drizzle and/or freezing rain may or may not be present. 
Icing in Precipitation  Icing occurring from an encounter with freezing precipitation, that is, supercooled drops with diameters exceeding 0.05 mm, within or outside of visible cloud. 
Known Icing Conditions  Atmospheric conditions in which the formation of ice is observed or detected in flight. Note. Because of the variability in space and time of atmospheric conditions, the existence of a report of observed icing does not assure the presence or intensity of icing conditions at a later time, nor can a report of no icing assure the absence of icing conditions at a later time. 
Potential Icing Conditions  Atmospheric icing conditions that are typically defined by airframe manufacturers relative to temperature and visible moisture that may result in aircraft ice accretion on the ground or in flight. The potential icing conditions are typically defined in the Airplane Flight Manual or in the Airplane Operation Manual. 
Supercooled Drizzle Drops (SCDD)  Synonymous with freezing drizzle aloft. 
Supercooled Drops or /Droplets  Water drops/droplets which remain unfrozen at temperatures below 0 0C. Supercooled drops are found in clouds, freezing drizzle, and freezing rain in the atmosphere. These drops may impinge and freeze after contact on aircraft surfaces. 
Supercooled Large Drops (SLD)  Liquid droplets with diameters greater than 0.05 mm at temperatures less than 00C, i.e., freezing rain or freezing drizzle. 

22. PIREPs Relating to Turbulence
22.1 When encountering turbulence, pilots are urgently requested to report such conditions to ATC as soon as practicable. PIREPs relating to turbulence should state:
22.1.1 Aircraft location.
　
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