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Questions and Answers
What is the correct method for reporting RVR observed from multiple locations along the runway?
What is the correct method for reporting RVR observed from multiple locations along the runway?
Which observation period is designated for METAR and SPECI reports in RVR measurements?
Which observation period is designated for METAR and SPECI reports in RVR measurements?
In what scenario should only the RVR values occurring after a discontinuity be used for averaging?
In what scenario should only the RVR values occurring after a discontinuity be used for averaging?
What must be done if RVR is observed from only one location?
What must be done if RVR is observed from only one location?
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What is the minimum duration that qualifies as a 'marked discontinuity' in RVR observations?
What is the minimum duration that qualifies as a 'marked discontinuity' in RVR observations?
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How should the RVR be reported when it is less than 400 m?
How should the RVR be reported when it is less than 400 m?
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What abbreviation is used in METAR when RVR exceeds the maximum limit of 2000 m and horizontal visibility is less than 2000 m?
What abbreviation is used in METAR when RVR exceeds the maximum limit of 2000 m and horizontal visibility is less than 2000 m?
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When there are multiple runways available, how is RVR reported for a cross-runway configuration?
When there are multiple runways available, how is RVR reported for a cross-runway configuration?
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What indication should be provided if the RVR varies by 100 m or more during a 10-minute observation period?
What indication should be provided if the RVR varies by 100 m or more during a 10-minute observation period?
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What is the lower limit of RVR that shall be reported?
What is the lower limit of RVR that shall be reported?
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Study Notes
Reporting Runway Visual Range (RVR)
- RVR must be reported for both runway ends if multiple runways are available. For instance, R24/0800 R30/1200 for cross-runways.
- RVR is reported in specific increments:
- 25 m for RVR less than 400 m.
- 50 m for RVR between 400 m and 800 m.
- 100 m for RVR above 800 m.
- Rounding down to the nearest reporting step is required for any value outside the standard increments.
RVR Limits
- Minimum detectable RVR is 50 m; maximum is 2000 m.
- Reports indicate if RVR is less than 50 m or more than 2000 m if outside these limits.
- If RVR exceeds 2000 m but horizontal visibility is below this limit, use "ABV" in local routine/special reports and "P" in METAR/SPECI.
Reporting Below Minimum RVR
- Use "BLW" in local routine/special for RVR below detectable values and "M" in METAR/SPECI, followed by the value.
Averaging RVR Values
- A 10-minute period is used to monitor RVR trends, checking if the mean differs by 100 m over two 5-minute intervals.
- For METAR and SPECI, a mean is calculated over a 10-minute period; only data after any significant RVR changes are included.
Observation and Reporting Procedures
- RVR should be formatted as “(Element) (Runway) (Section) (RVR Value)”.
- Only the TDZ value is reported in METAR/SPECI without location, e.g., R24/1100.
- If RVR is observed from multiple locations (TDZ, MID, END):
- Always report TDZ first in METAR/SPECI without location indication.
- In local routine reports, include values for TDZ, MID, and END, e.g., "RVR RWY 17 TDZ 600M MID 500M END 400M."
Technology and Equipment
- An automated Transmissometer system assesses RVR with assemblies near the TDZ, midpoint, and stop end.
- RVR data is displayed and reported when visibility is ≤ 2000 m.
- Stations must maintain operational capability of RVR systems even when visibility exceeds 2000 m, guided by local conditions.
Display and Record Keeping
- RVR data for the TDZ should be appended in METAR on Mausam Online when visibility is ≤ 2000 m.
- Specific RVR measuring increments must be adhered to for accurate reporting.
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Description
This quiz covers the guidelines for reporting Runway Visual Range (RVR) at airports with multiple runways. It discusses the specifics of how to report RVR for both parallel and cross-runways in different visibility conditions. Perfect for aviation professionals looking to refresh their knowledge on RVR reporting.
