Added: Shawnice Chisolm - Date: 20.01.2022 13:34 - Views: 17779 - Clicks: 1788
One of the essential factors in aviation weather is flight visibility. Visibility is the only legal weather requirement that must be met when landing after an instrument approach. RVR is one way of measuring visibility. It stands for runway visual range, and it is measured along the length of a runway. RVR is accurate and advanced, so it is usually installed on runways at major airports where instrument landing systems ILS are installed.
This represents how far an observer in the tower cab can see horizontally. In the cabs of most towers, they have a reference card that shows known landmarks and their distance from the tower. Based on what landmarks they can see, Runway visual range controllers can then report the visibility from the tower. Among their other instruments is a scatterometer that measures the amount of stuff suspended in the atmosphere. This is easily translated into a horizontal visibility. The problem with both of these methods is that it is not the visibility as would be seen by the pilot. The tower cab or AWOS station is often not near the runway threshold.
At large airports with multiple runways, the instruments might be miles away. RVR provides a runway specific visibility. Instruments are mounted alongside the length of the runway, and the visibility is reported in terms of how many feet an observer could see down the runway if they were standing on the threshold. For an aircraft landing after an instrument approach, the RVR system has several benefits.
For one, the pilots will have an idea of the actual conditions on the runway before the approach. RVR also allows for lower landing minimums in some situations. Cat 2 and Cat 3 ILS approaches require runway visual range. RVR may be reported in either feet or meters, depending on the location in the world. In the United States, it will be in feet. METARs are routine weather reports published for airports all over the world. Pilots refer to these coded weather observations when planning flights and even when in the air approaching their destination.
Translation: North Bay Airport, 15th of the month at Zulu time. Automatic report. Winds from degrees at 4 knots. Visibility 0 statute miles, RVR Runway 08 is feet, no trend not changing. Vertical visibility feet. Temperature 07, dew point Altimeter setting Remarks: Sea level pressure Here, you can see a color-coded table updated with the current conditions.
Sometimes equipment breaks and RVR monitors are no different. When an approach has RVR published, but the equipment is not providing information, the pilot may have to convert the landing minimums for the approach with a standard. Because the two methods involve some inaccuracies, a table of conversions is published in the Federal Aviation Regulations. The table standardizes the math so that everyone is on the same and saves time in the cockpit.
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What is Runway Visual Range (RVR)?