'Весь авиационный мир"'??? Это какой, например? Авиационный мир, который я знаю, использует reported braking action, это совсем не Ксц.
https://skybrary.aero/index.php/Aquaplaning
It is unlikely that the actual depth of water on a runway will be passed to an aircraft by ATC; at present, equipment which takes tactical friction measurement on
wet runways (as opposed to surfaces with frozen deposits) is
rarely authorised for use, so the best information a pilot is likely to get prior to landing is an informal braking action comment made to ATC
by a previously landed aircraft.
FCTM 737
One of the commonly used runway descriptors is
coefficient of friction. Ground friction measuring vehicles typically measure this coefficient of friction. Much work has been done in the aviation industry to correlate the friction reading from these ground friction measuring vehicles to airplane performance. Use of ground friction vehicles raises the following concerns:
• the measured coefficient of friction depends on the type of ground friction measuring vehicle used.
There is not a method, accepted worldwide, for correlating the friction measurements from the different friction measuring vehicles to each other, or to the airplane's braking capability.
• most testing to date, which compares ground friction vehicle performance to airplane performance, has been done at relatively low speeds (100 knots or less). The critical part of the airplane's deceleration characteristics is typically at higher speeds (120 to 150 knots).
• ground friction vehicles often provide
unreliable readings when measurements are taken with
standing water, slush or snow on the runway. Ground friction vehicles might not hydroplane (aquaplane) when taking a measurement while the airplane may hydroplane (aquaplane). In this case, the ground friction vehicles would provide an optimistic reading of the runway's friction capability. The other possibility is the ground friction vehicles might hydroplane (aquaplane) when the airplane would not, this would provide an overly pessimistic reading of the runway's friction capability. Accordingly, friction readings from the ground friction vehicles
may not be representative of the airplane's capability in hydroplaning conditions.
• ground friction vehicles measure the friction of the runway at a specific time and location. The actual runway coefficient of friction may change with changing atmospheric conditions such as temperature variations, precipitation etc. Also, the runway condition changes as more operations are performed.
The friction readings from ground friction measuring vehicles
do supply an additional piece of information for the pilot to evaluate when considering runway conditions for landing. Crews should evaluate these readings in conjunction with the
PIREPS (pilot reports) and
the physical description of the runway (snow, slush, ice etc.) when planning the landing. Special care should be taken in evaluating all the information available when braking action is reported as poor or if slush/standing water is present on the runway.
Замечу, что у Боинга нет расчета ВПХ по Ксц. Авиакомпании умудряются использовать таблицы перевода, что не совсем одно и то же.