Figure 1-17. RCR Values and Corresponding Braking Action

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:

"P" is appended to the RCR when there are patches of ice, snow, or slush on the

runway.

"SANDED" is appended when runways have been treated with sand or other friction

enhancing materials.

"P WET" or "P DRY" is appended whenever the rest of the runway is either wet or

dry.

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