时间：2020-03-15 10:34来源：蓝天飞行翻译公司 作者：民航翻译 点击：次
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Multiple Contaminants. Multiple contaminants are a combination of contaminants (as identified in the RCAM) observed on paved surfaces. When reporting multiple contaminants, only the two most prevalent contaminants are reported. When reporting on runways, up to two contaminant types may be reported for each runway third. The Runway Condition Code (when applicable) will be based on the most hazardous contaminant, when both contaminants are not from the same category in the RCAM. The reported contaminants may consist of a single and layered contaminant, two single contaminants, or two layered contaminants. The reporting of “multiple contaminants” represent contaminants which are located adjacent to each other, not to be confused with a “layered contaminant” which is overlapping. For example: ● Single contaminant and Layered contaminant. ‘Wet’ and ‘Wet Snow over Compacted Snow’ ● Single contaminant and Single contaminant. ‘Wet Snow’ and ‘Slush’ ● Layered contaminant and Layered contaminant. ‘Dry Snow over Compacted Snow’ and ‘Dry Snow over Ice’ Oil Oil is a viscous liquid, derived from petroleum or synthetic material, especially for use as a fuel or lubricant. Runways (Primary and Secondary). Primary Primary Runways are runways being actively used or expected to be used during existing or anticipated adverse meteorological conditions, where the majority of the takeoff and landing operations will take place. Secondary Secondary runways are runways that support a primary runway and is less operationally critical. Takeoff and landing operations on such a runway are generally less frequent than on a primary runway. Snow removal operations on these secondary runways should not occur until Priority 1 surfaces are satisfactorily cleared and serviceable. Runway Condition Assessment Matrix (RCAM). The RCAM is the tool (Table 5-2) by which an airport operator will assess a runway surface when contaminants are present. Runway Condition Code (RwyCC) Runway Condition Codes describe runway conditions based on defined contaminants for each runway third. Use of RwyCCs harmonizes with ICAO Annex 14, providing a standardized “shorthand” format (e.g., 4/3/2) for reporting. RwyCCs are used by pilots to conduct landing performance assessments. RwyCCs are reported based on the direction of the assessment and may read in reverse when aircraft are operating from the opposite direction. Sand Sand is a sedimentary material, finer than a granule and coarser than silt. Slippery When Wet Runway For runways where a friction survey (conducted for pavement maintenance) indicates the averaged Mu value at 40 mph on the wet pavement surface failed to meet the minimum friction level classification specified in AC 150/5320-12, Measurement, Construction, and Maintenance of Skid Resistant Airport Pavement Surfaces, the airport operator must reports via the NOTAM system a RwyCC of ‘3’ for the entire runway (by thirds: 3/3/3) when the runway is wet. The runway condition description “Slippery When Wet” is used for this condition. Do not report a “Wet” runway when a “SLIPPERY WHEN WET” NOTAM is in effect. When a “SLIPPERY WHEN WET" NOTAM is in effect, report the runway condition “Slippery When Wet” instead of “Wet” for the relevant thirds. If airport operator judgment deems a downgrade is necessary, the downgrade must be made such that all three runway thirds match (i.e. 3/3/3, 2/2/2, 1/1/1). An airport may discontinue the use of this NOTAM when the runway minimum friction level classification has been met or exceeded. Slippery When Wet is only reported when a pavement maintenance evaluation indicates the averaged Mu value on the wet pavement surface is below the Minimum Friction Level classification specified in Table 3-2 of AC 150/5320-12. Some contributing factors that can create this condition include rubber buildup, groove failures/wear, and pavement macro/micro textures. |
