 - ASTM
- ASTM International is a standards organisation: committee ASTM E17 has produced standards for test tyres to be used by all CFMEs recognised by ICAO.
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- Check Runs
- Runs intended to confirm that the operation of the CFME remains constant. These are performed before and after Standard Runs.
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- Continuous Friction Measuring Equipment (CFME)
- A device designed to produce continuous measurement of runway friction values.
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- Design Objective Level (DOL)
- The State-set friction level to be achieved or exceeded on a new or resurfaced runway within one year.
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- Friction Level
- The lowest average friction value calculated from a minimum of 10 average friction values, of applicable Standard Runs, obtained over a rolling distance of 100 metres within a portion of the pavement.
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- Hydroplaning
- The condition when a layer of water separates an aircraft's tyres from the runway surface.
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- Maintenance Planning Level (MPL)
- The State-set friction level below which a runway maintenance programme should be undertaken.
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- Minimum Friction Level (MFL)
- The State-set friction level below which a runway shall be notified as ‘may be slippery when wet’.
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- Portions of the Pavement
- A rectangular area of the runway width running the declared length, referred to as the ‘central’ trafficked portion and two ‘outer’ portions.
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- Runway Surface Friction Assessment or Testing
- The assessment of friction carried out under conditions of self-wetting using a CFME.
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- Standard Runs
- The assessment of friction carried out under conditions of self-wetting using a CFME.
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- Test Water Depth
- Test water depth (also known as nominal test water thickness). The water flow rate produced by the CFME’s self-wetting equipment divided by the test speed multiplied by the width of application.
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- Wet Runway Surface
- A runway that is soaked but no significant patches of standing water are visible.
Note: Standing water is considered to exist when water on the runway surface is deeper than 3mm.
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