Quantcast Figure 1-17. RCR Values and Corresponding Braking Action

 

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CHAPTER ONE
METEOROLOGY FLIGHT PLANNING
Runway Braking
Equivalent
% Increase in
Action Reading
Terminology
Landing Roll
02 to 05
NIL
100% or more
06 to 12
POOR
99% to 46%
13 to 18
FAIR (MEDIUM)
45% to 16%
19 to 25
GOOD
15% to 0%
Figure 1-17 RCR Values and Corresponding Braking Action
The following will be added to the report when applicable:
1.
"P" is appended to the RCR when there are patches of ice, snow, or slush on the
runway.
2.
"SANDED" is appended when runways have been treated with sand or other friction
enhancing materials.
3.
"P WET" or "P DRY" is appended whenever the rest of the runway is either wet or
dry.
4.
ICAO braking action remarks (such as BA GOOD, BA NIL) may be reported at
airfields not equipped with decelerometers when required.
Examples:
PSR15
Packed snow on runway, RCR value 15
IR//
Ice on runway, no RCR value available
LSR08P DRY
Loose snow on runway, RCR value 08 patchy, rest
of runway dry
WR//
Wet runway
RCRNR
Base Operations closed
PSR12 HFS IR08
Packed snow on runway, RCR value 12 on
touchdown, on rollout portion of a high friction
surface with ice on runway, RCR value 08
PSR//SANDED BA MEDIUM
Packed snow on runway, no RCR available, runway
treated with friction enhancer, braking action
medium
Freezing Level Data (RADATS) -- Information beginning with the contraction RADAT gives
freezing level data. (Think of RAdiosonde DATa. A radiosonde is a weather balloon.) RADAT
is followed by the relative humidity (RH) at the freezing level and the height of the freezing level
in hundreds of feet MSL. When multiple crossings are reported, the order will be the lowest
crossing first, followed by the intermediate crossing with the highest RH, then the highest
1-16  AVIATION ROUTINE WEATHER REPORTS AND TERMINAL AERODROME
FORECASTS


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