ED Decision 2021/003/R
TREND MONITORING PROGRAMME
(a) The objective of the trend monitoring programme is to ensure that the surface friction characteristics for the entire runway remain at or above the minimum standards, to avoid the runway becoming slippery wet.
(b) Degradation is typically caused by rubber deposits, surface polishing or poor drainage. These can be mitigated as follows:
(1) Accumulation trend of rubber can be managed through a rubber removal programme.
(2) Polishing trend of the surface can be managed by monitoring loss of sharpness and retexturing/resurfacing programme.
(3) Drainage trend can be managed by monitoring changes in geometry and blocking of drainage channels and reshaping programme.
(c) In the construction of new runways or the resurfacing of existing runways, the construction of surfaces with adequate slopes and aggregate of angular fragments from crushed gravel or stone so as to provide a sharp texture will help to ensure surface friction characteristics providing good braking action in wet conditions. The surface friction characteristics of a new constructed or resurfaced runway surface establish the normal starting point for trend monitoring; however, trend monitoring can also start at any given time through the lifespan of a pavement.
(d) The determination that a runway or portion thereof is slippery wet stems from various methods used by themselves or in combination. Additionally, substandard runways or portion thereof can be identified through repeated reports by aeroplane operators based upon flight crew experience or through analysis of aeroplane stopping performance. When such reports are received, it is an indication that the surface friction characteristics are likely to be severely degraded and immediate remedial action is necessary.
Guidance on runway trend monitoring to maintain friction above minimums, manage rubber, polishing, and drainage, and ensure safe wet braking conditions.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
Loading collections...