ED Decision 2021/003/R
DOWNGRADING AND UPGRADING
(a) The RCAM allows making an initial assessment based on visual observation of contaminants on the runway surface: their type, depth and coverage, as well as the outside air temperature. Downgrading and upgrading is an integral part of the assessment process and essential to developing relevant reports of the prevailing runway surface condition.
(b) Examples of aspects to be considered in assessing the runway slipperiness for the downgrade process:
(1) Prevailing weather conditions
(i) stable sub-freezing temperature
(ii) dynamic conditions
(iii) active precipitation.
(2) Observations
(3) Measurements
(i) friction measurements
(ii) vehicle behaviour
(iii) shoe scraping
(4) Experience (local knowledge)
(5) Special air-reports
(c) When the complete removal of contaminants cannot be achieved, but the RWYCC initially assigned does not reflect the real surface condition, the aerodrome personnel may apply the upgrade procedures. Upgrading is applicable only when the initial RWYCC is 0 or 1. Upgrading can only occur up to RWYCC 3.
(d) When upgrading RWYCC 0 and 1, a preponderance of evidence needs to exist pointing towards the higher RWYCC.
(e) When a friction measuring device is used for upgrading purposes, a preponderance of evidence needs to exist. In order to upgrade a RWYCC 0 or 1 to no higher than RWYCC 3, the friction measuring device needs to demonstrate an equivalent friction to that of a wet runway (RWYCC 5) or higher.
Guidance on assessing runway surface condition, including downgrading and upgrading procedures, with evidence requirements for RWYCC changes up to 3. (160 characters)
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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