How to Convert Met Visibility

How to Convert Met Visibility when you don't have an RVR reading.

Disclaimer: all information presented in this video does not substitute actual study and preparation for flight. Please take time to study your manuals for up to date information and your own companies limitations (which may be more restrictive)

Thumbnail image author : golfcharlie232

[aldiniaircrafts]

Thank you so much! Your videos are simply the most intuitive and easy way to understand and learn these concepts! I know that’s not easy to prepare them but.. these are really appreciated.

[ambbma]

This is by far the best and easiest presentation I have ever seen about the CMV. Thanks for the good work!

[terringeorge]

Incredibly good. Sad that it took me so long to find your page. Thank you so much.

[bruno]

Good job on the subject!
I would just add that in the case of LIDO charts, all minima values are CMV unless there's an R or V next to it.

[coskunkorkmaz]

Conversion of meteorological visibility to RVR is not be used:
• for takeoff,
• for calculating any other required RVR minimum less than 800 m (1/2 sm),
• for visual/circling approaches,
• or when reported RVR is available
• for cat 2 and 3.

[McAmber]

thx for sharing, interesting to watch 😉

[kemalcaki]

Simple, useful, well explained ever video for CMV.thanks for your effort.

[stereagwnia]

Amazing explanation. Saved me a lot of time. Thank you very much.

[cristoballozano]

Thank you, great explanation. I´ve seen tables with RVR/SM/METERES equivalences...so what are they for if you should do this procedure? I thought memorizing those values and applying the equivalences was the correct way. Hope someone can clarify this for me.

[mirkocirillo]

Very interesting for pilot in training....Thanks!

[neobusa]

Well done illustration .Brillant work.

[fmp]

Thank you very much for the video. But there are few ambiguities that may be a result of Jeppesen and Lido different interpretations on this subject. 
For instance, according to Lido interpretation, the term "CMV" denotes the result after the conversion of a visibility into a RVR. Thus, a CMV is always equally high as a RVR. 
- "RVR" and "VIS" are called "limiting values". That means, those values must be reported by and received from ATC in the respective format (as RVR where "RVR" is shown next to the minimum, or as VIS where a "VIS" is shown next to the minimum. These values may not be converted!). 
- Only "CMVs" may be converted. A conversion is only possible from an ATC reported VIS into a CMV (RVR) but never from an RVR into a VIS.

[RomainLFMT]

At 5:00, should not it be 800 * 1.5 = 1200m? :)

[luisxavier]

There is one more rule that was not mentioned (or maybe it was but i missed it). By regulations it is no allowed to convert visibility from an RVR reading.

[tackaerep]

Hey, great video. But there are few things that are a bit confusing for me.
Firstly, you also can’t convert vis to RVR if you are shooting for cat 2 and 3.
Also, as I understood from the ops, you can’t convert for REQUIRED RVR of less then 800m, it’s a bit ambiguous still for me.
For example if I’m going for CAT I and required RVR is 550m, it still doesn’t matter as I think I need to RVR of 800m minimum via conversion.
Please correct me if I am wrong.

[fahadusmani]

So if required RVR is 550m, I will take the 800m figure, and divide it by 1.5 to get 533m as the required met visibility?

[pirexs]

How can I do if I the chart doesn´t have the CMV??

[yashladdha]

According to which regulation is this allowed?

[mateusdurigon]

Really good explanation, but I didn’t understand that you converted 600 visibility to RVR and than you got 900 but you can’t convert 800m visibility to RVR. Or the result shall not be lower than 800m? I didn’t get it