local showed a 900-foot overcast with 10 miles visibility, plus a 2-degree temperature-dewpoint spread (13/11) that could have made flight visibility worse. Lower won't work It states that the "RVR to Visibility Conversion" table may be used for converting RVR to flight visibility .

(i) For multi-engined aeroplanes, whose performance is such that, in the event of a critical power unit failure at any point during take-off, the aeroplane can either stop or continue the take-off to a height of 1 500 ft above the aerodrome while clearing obstacles by the required margins, the take-off minima established by an operator must be expressed as RVR/Visibility values not lower than those given in Table 1 below except as provided in paragraph 4. below:

(MDA/H ) and, if Table 1: Conversion of Meteorological visibility to RVR. Lighting  7 Feb 2020 Page 15 of 59. An agency of the European Union. Table 1.A Type of runway vs minimum RVR. Type of runway. Minimum RVR or flight visibility.

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This value is normally determined by visibility sensors located alongside and higher than the center line of the runway. RVR & Visibility JAR OPS has a table giving a conversion factor for converting RVR to visibility. Generally speaking, the factors indicate that RVR will be equal to or greater than the associated visibility - I would have thought it was the other way round, but I'm hardly an expert. Any one got an explanation or view on this? The RVR minima used may not be lower than either of the values given in Table 1 above or Table 2 below. Table 2 Assumed engine failure height above the runway versus RVR/visibility Take – off RVR/visibility Runway Visual Range (RVR) follows the visibility and begins with the letter “R.” The runway heading will follow the “R,” and in this example, “32L” represents runway 32-Left (C-Center, R-Right). The last four digits report the visibility in feet.

Low Visibility T/O – Operational procedures Take Off with 125m ≤ RVR ≤ 150mSame as T/O with RVR ≥ 150m, plus… Both pilots must be previously simulated trained (in order to have the required authorization) Max Xwind 10 kts Braking action not lower than “good” Loc indication is recommended on PFD’s Vis from cockpit must not be less than 90m at start of TOR (6 lights spaced 15m or

8. Supplementary Vid RVR värden understigande 550 m under mörker och 300 m under dager when ceiling or vertical visibility falls below 200 ft.

RVR is only reported at airports that have RVR sensing equipment, when the visibility is 1 statue mile or less, or when RVR for an instrument runway is 6,000 feet or less. In a METAR, RVR starts with the runway, coded with the letter "R", followed by the runway number. In this example, "R18R" means RVR is being reported for runway 18 Right.

RVR Visibility Event is defined as any time when RVR is less than 6,500 ft (US) or 1,600 m (international). The most common causes are fog and snow. In the US, the 3 categories of RVR are: Cat I for 2,400 ≤ RVR ≤ 6,500 ft; Cat II for 1,200 ≤ RVR < 2,400 ft; and Cat III for RVR < 1,200 ft Since RVR products are computed and reported to RVR 2600 – 1200 Item Acceptable Mitigation / Limitation Options Comments 1. 8.6.1.2 A reduced visibility operations plan is provided at an aerodrome operating in visibility conditions below RVR 2600 (½ SM) down to RVR 1200 (¼ SM). The earlier reduction of visibility/RVR appeared to be due to both rain and fog, although the observer missed the rain event. Both the observed and parameterized RVR values during the reduced visibility period were significantly higher than the observed visibility, reaching a factor of 5 when the visibility was approaching 100 m.

So, be careful. You can get down to 1/4 sm vis, but you can’t go below 1/4 statute miles visibility at airports without RVR. Here is the conversion table for RVR and visibility: 2.24 Runway Visual Range (RVR) – An instrumentally derived value based upon standard calibrations that represent the horizontal distance a pilot will see down the runway from the approach end. (Reference AC 97-1, current edition) (a) Touchdown RVR – The RVR visibility readout values obtained from RVR equipment serving the runway touchdown zone.
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Even if RVR and flight visibility aren’t the same, someone needs to teach the FAA math.

An instrumentally derived value, it represents the horizontal distance a pilot will see down the runway from the approach end. RVR is based on the sighting of either high intensity runway lights or the visual contrast of other targets, whichever yields the greater visual range. meaningful predictions of RVR from prevailing visibility reports can only be accomplished if the assessment of both RVR and visibility is by reference to common sensor(s). The need to retain flexibility in the application of recommendation 4.3.1.1 of Appendix 3 to the Annex that calls for RVR to be assessed at a height of approximately 2.5 m JAR-OPS AOM are generally expressed in RVR. If only meteorological visibility is reported, the charted RVR value can be substituted by reported meteorological VIS for straight-in instrument approaches as shown in Table 1.
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The. RVR/VIS minimums used may not be lower than either those specified in Table 2 or 3. Page 2. LOW VISIBILITY TAKE-OFF. A take-off on a runway where 

3200. 5 / 8. 4000. 3 / 4. 4500.

Requirements for RF legs will be indicated on the approach chart in the notes Note that while several approaches will include both RVR and Flight Visibility 

Landing minimums 14 mile. & SSALR. (2) ILS with visibility minimum of 1,800 RVR. RVR values are used when the prevailing visibility is 6,000 feet or less and is reported in feet in incre ments as noted in Table 1.

of RVR and Visibility Table with the RVR & SM visibility values that are derived from TERPS for procedure publication. The existing Comparable Values of RVR and Visibility Table reflects RVR & Statute Mile (SM) visibility values that were replaced in 2007(TERPS Change 20), and are not fully harmonized with 8260.3C. The runway visual range named RVR should be reported whenever visibility or RVR is less than 1 500 m, particularly at aerodromes having precision approach runways or runways used for take-off with high- intensity edge lights and/or centre line lights, including aerodromes with runways intended for Category I approach and landing operations. On most runways equipped with RVR, there are three sensors: a touchdown sensor, a mid-point sensor, and a rollout sensor. (boldmethod.com) On the other hand, visibility is typically measured by detecting scattered light from a strobe (scatterometer): The most common method of measuring the extinction coefficient is the forward scatter system.