Question about non-SD minimas

[Vincent340]

Hi everyones,

I starting to train myself some interesting airfield in Europe, and I have a problem with LFKJ - Campo Dell'Oro (France).

Here's the IAP, coming from the French AIP :

http://www.sia.aviation-civile.gouv....D%202.LFKJ.pdf

See the page N°5. If I want to fly the LOC 02, the missed approach point is at 4.5 nm from the treshold. So, I need of 8300 meters of visibility to spot the runway, BUT the minimum RVR for this approach is 2000 m !

My question : Why the RVR is so low ? With fog or mist, you won't be able to see the runway. Is someone already made this approach ?

Thanks in advance for any reply,
Vincent.

[oldebloke]

Remember,Like a lot of authorities around the world,one only needs a 'certain' RVR/Vis to attempt the approach.But a lot hangs on the 'legal' required Visual references encountered at DH/MDA..Ergo if one can see the terrain at the MAP one might continue 'Visually'to the field.
At the moment In Canada , one only needs'1200RVR' to start the approach,the onus being on the crews'Visual' assessment (regulation)at DH/MDA..If the a/c doesn't arrive on the runway one is in Violation of said Reg'....

[Vincent340]

Hi,

An answer from another forum :

1. The distance of the MAP is calculated according to the obstacle clearance required by the missed approach segments;

2. The RVR minimum for a runway is calculated, not based on the MAP distance, but based on the MDA and the airport infrastructure.

That explain the illogic difference between the RVR and the required visibility for the approach.

Bye,
Vincent.

[Clandestino]

My question : Why the RVR is so low ? With fog or mist, you won't be able to see the runway.

Not quite. Fog layer can sometimes be less than 100 ft deep with 10+ km visibility above. In such a circumstances, you can see all rwy and approach lights when you descend to your minimum and continue your approach below (M)DA. When your cockpit plunges into fog layer, you loose quite a bit of forward visibility - it's not smart to disregard RVR just because you see the RWY all the time. At worst, you can loose the sight of it in the flare.