PDA

View Full Version : CMV on Approach plates

picollo
22nd Apr 2011, 07:49
Hi all,
EU ops have now started putting CMV on non precision approaches.
would anyone out there know the advantage of putting this on the charts?

thanks

alatriste
22nd Apr 2011, 10:32
Hi Piccolo,
CMV stands for Converted Meteorological Visibility.
According EU-OPS AOM is " A value (equivalent to an RVR) which is derived from the reported meteo visibility by using particuraly conversion factors"
It is the minima for NPA when the required RVR is greater then 2000m.

The conversion factors are equal to those used to convert reported vis to RVR when RVR data is not provided by the tower.

You can find the table in the page 602 of the Jeppesen text booklet vol1.

Example: TWR reports 1100 m visbility and you need a CMV of at least 2100m to fly a VOR aproach. If you are at night time and HIALS and HIRL are operative for the active RWY, the conversion factor is 2, therefore 1100m vis equals to 2200 m CMV. Above minima.

picollo
23rd Apr 2011, 08:19
Thanks for the reply. I think I understand it better now.

So instead of posting two values , one for RVR and one for VIZ, not they do the conversion for you and post it as CMV?

bfisk
24th Apr 2011, 13:58
For all practical purposes, CMV = RVR. The difference is that RVR is reported, CMV is calculated based on reported met.vis. (vis x 1,5 or 2,0 depending).

3greens 1inthemirror
29th Jul 2013, 08:10
what is the multiplying factor(x 1.5, x 2) dependent upon?

underfire
6th Aug 2013, 21:39
Conversion factors are per Appendix E of 9635

Illustrated as Appendix A of this document:

http://www.icao.int/safety/meteorology/amofsg/AMOFSG%20Meeting%20Material/AMOFSG.10.SN.011.5.en.pdf

kuobin
9th Aug 2013, 00:37
I also want to know"would anyone out there know the advantage of putting this on the charts?"

jet commander 64
10th Aug 2013, 13:02
Because if you get a general visibility (VIS) you can easily convert it in CMV and properly fly the NPA with CDFA technique, that is mandatory in EASA; most non LVP rwy in Europe and around the world do not have RVR trasmisometer.

Lantirn
4th Jan 2022, 16:32