Braking Action unreliable vs. unreported ?
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Join Date: Mar 2005
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Braking Action unreliable vs. unreported ?
It has been recognized that measured friction coefficients are reliable only for some type of contaminants.
For this reason today is very common to find 99 or // in the related METAR codes for some Countries.
I know that braking action must always be considered as "poor" when 99 code is present and according Company policy flight cannot be dispatched with braking action "poor".
What if code // is reported.... do I have to consider "poor" as well ?
Thanks
For this reason today is very common to find 99 or // in the related METAR codes for some Countries.
I know that braking action must always be considered as "poor" when 99 code is present and according Company policy flight cannot be dispatched with braking action "poor".
What if code // is reported.... do I have to consider "poor" as well ?
Thanks
Join Date: Jun 2001
Location: Chicago, IL, USA
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Our guidance specifically warns *against* trying to correlate friction readings with braking action.
After all, one, as you say, is a scientific measure of friction under certain conditions.
The other is a subjective report received by a specific type of airliner. Your results may vary.
Again, experience and judgment are more important than an individual report. You must consider all information when making these decisions.
After all, one, as you say, is a scientific measure of friction under certain conditions.
The other is a subjective report received by a specific type of airliner. Your results may vary.
Again, experience and judgment are more important than an individual report. You must consider all information when making these decisions.
