No comments here other than to say it is allowable under certain circumstances to make an approach in 400m visibility.
If RVR is not reported the visibilities which are passed will be met visibilities. These are factored by 1.5 by day and 2.0 by night to give an equivalent RVR. 400m met vis becomes 800m RVR at night. Min RVR required on 26 is 700m, so no problems here.
The reporting of RVRs ceased on the IOM when the firefighters were prevented from undertaking the task - the H&S didn't like the fact that they were standing atop of their engines to obtain the measurements. RVR reporting may have been reinstated since, but this was certainly the method of determining equivalent RVRs a few months ago.
Last edited by Capt. Horrendous; 16th Sep 2005 at 13:23.