时间：2020-06-25 08:22来源：蓝天飞行翻译公司 作者：民航翻译 点击：次
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— at temperatures at and below ISA, 80 per cent relative humidity; — at temperatures at and above ISA + 28°C, 34 per cent relative humidity; and — at temperatures between ISA and ISA + 28°C, the relative humidity varies linearly between the humidity specified for those temperatures. Runway condition assessment matrix (RCAM).* A matrix allowing the assessment of the runway condition code, using associated procedures, from a set of observed runway surface condition(s) and pilot report of braking action. Runway condition code (RWYCC). A number describing the runway surface condition to be used in the runway condition report. Note. — The purpose of the runway condition code is to permit an operational aeroplane landing performance calculation by the flight crew. Procedures for the determination of the runway condition code are described in the PANS- Aerodromes (Doc 9981). Runway condition report (RCR).* A comprehensive standardized report relating to runway surface condition(s) and its effect on the aeroplane landing and take-off performance. Runway surface condition(s).* A description of the condition(s) of the runway surface used in the runway condition report which establishes the basis for the determination of the runway condition code for aeroplane performance purposes. Note 1.— The runway surface conditions used in the runway condition report establish the performance requirements between the aerodrome operator, aeroplane manufacturer and aeroplane operator. Note 2.— Aircraft de-icing chemicals and other contaminants are also reported but are not included in the list of runway surface condition descriptors because their effect on runway surface friction characteristics and the runway condition code cannot be evaluated in a standardized manner. Note 3.— Procedures on determining runway surface conditions are available in the PANS-Aerodromes (Doc 9981). a) Dry runway. A runway is considered dry if its surface is free of visible moisture and not contaminated within the area intended to be used. b) Wet runway. The runway surface is covered by any visible dampness or water up to and including 3 mm deep within the intended area of use. c) Slippery wet runway. A wet runway where the surface friction characteristics of a significant portion of the runway has been determined to be degraded. d) Contaminated runway. A runway is contaminated when a significant portion of the runway surface area (whether in isolated areas or not) within the length and width being used is covered by one or more of the substances listed in the runway surface condition descriptors. Note.— Procedures on determination of contaminant coverage on runway are available in the PANS-Aerodromes (Doc 9981). e) Runway surface condition descriptors. One of the following elements on the surface of the runway: Note.— The descriptions for e) i) to e) viii) are used solely in the context of the runway condition report and are not intended to supersede or replace any existing WMO definitions. i) Compacted snow. Snow that has been compacted into a solid mass such that aeroplane tires, at operating pressures and loadings, will run on the surface without significant further compaction or rutting of the surface. ii) Dry snow. Snow from which a snowball cannot readily be made. iii) Frost. Frost consists of ice crystals formed from airborne moisture on a surface whose temperature is below freezing. Frost differs from ice in that the frost crystals grow independently and therefore have a more granular texture. Note 1.— Below freezing refers to air temperature equal to or less than the freezing point of water (0 degree Celsius). |
