Meikleour,
I humbly kneel before the temple of total aviation knowledge however is it not the case that the Jeppesen symbology used to indicate the siting of transmissometers not also indicate their respective orientation?
NOT quite so my good Sir. 10-9 clearly depicts the position and orientation of the transmissiometers along the relevant RWY. The technical measurement of the IRVR is valid for both directions however it's operational use might be restricted. The solution to the riddle is the applicable minima criterium charted on the approach plate.
DEPICTION OF EU-OPS AOM IN CASE OF EXISTING STATE MINIMUMS
If State minimums are officially published, the depiction of AOM may differ from the standard depiction where all values are expressed as RVR or CMV.
a.
If RVR/CMV and VIS are charted together, the RVR value is compulsory. If no RVR is reported, the VIS has to be used without conversion.
b.
No prefix is charted if RVR/CMV and VIS is identical. The reported RVR is compulsory. If no RVR is reported, the VIS has to be used without conversion.
c.
If only VIS is charted, the VIS has to be used without conversion.
