How to Interpret the RVR Data
The RVR data is presented in two format, table and graph.
The table shows all current RVR data for the given airport.
Figure 1 shows a sample table.
The graphs shows RVR data for the last hour for a single runway.
Figure 3 shows a sample graph.
1: Sample Table of RVR Data for an Airport
The table of RVR data for an airport as
shown in Figure 1. The following information appears at the top of the cell.
The table displays the following information.
- Each runway (Item 5) is identified by its 2 digit identifier
followed by its sub-identifier, either "R", "L", "C", or " "; where "R"
indicates right, "L" indicates left, "C" indicates center, and " " indicates
that there is no sub-identifier. All runways at this airport that have RVR
sensors will be shown in this table.
- The touchdown, midpoint, and rollout RVR values are displayed for each
runway. In some cases, only a touchdown RVR value is shown, with midpoint
and rollout values being blank (refer to runway 27 in Figure 1); or
touchdown and rollout RVR values are shown, with the midpoint value being
blank (refer to runway 09 in figure 1). This is based on the
instrumentation of the runway and its rated landing category. A blank value
for RVR on the display indicates that no RVR system visibility sensor is
needed for that precision point on the runway based on the instrumentation
and landing category of that runway.
- Each RVR value (Item 6) is displayed in feet, ranging from
0000 to 6000. A display of 6500 indicates that the RVR is greater than 6000
feet. An RVR value of "FFF" (Item 8) indicates that a corresponding RVR sensor
is off-line or data is invalid.
- A trend indicator (Item 7) is displayed directly to the
right of each displayed RVR value. The trend indicator indicates the RVR trend
(increasing, decreasing, or steady) over the previous 5-minute window.
Increasing trends are indicated with a "+". Decreasing trends are indicated
with a "-". Steady trends are indicated with a blank.
- The edge light settings (Item 9) range from "0" to "5", with
"0" indicating that the edge lights are off and "5" indicating maximum
intensity. An edge light setting of "F" indicates the RVR system sensor
monitoring the edge lights is off-line or that the data is invalid.
- Centerline Light settings (Item 10) range from "0" to "5",
with "0" indicating that the centerline lights are off and "5" indicating
maximum intensity. A centerline light setting of "F" indicates the RVR system
sensor monitoring the centerline lights is off-line or that the data is
invalid. A blank Centerline light setting indicates that the runway is not
configured with Centerline lights.
If data is not currently being received for an airport, then the message,
"Data Not Available" will be displayed, as shown in Figure 2.
2: Sample Display When Current Data is Not Available from an
The historical graph of RVR values for a runway are shown in Figure 3.
A graph is updated once every five minutes.
3: Sample Graph of RVR Data for a Runway
At the top of the cell is the airport ID and the Back to Menu link as
in Figure 1. Inside the graph is the following.
Figure 4: Graph Key