Approach ban?

[zip400]

If you have to "discontinue" the approach, at the OM for ex. and say its at 2500', how do you do it? pull up? level off? select lnav? follow MA path though still far?

[slast]

It's to limit the probability of making an unsuccessful approach, for both safety and economic reasons.

The rationale is that once you have passed 1000 ft (which was chosen simply as an easy reference point), "RVR" information has fulfilled its basic purpose as a mandatory MINIMUM, and becomes merely advisory. Assuming no subsequent equipment failures, whether a go-around is needed now depends on what the pilot can ACTUALLY see on reaching Decision Height.

The approach ban reference is in the section on RVR reports and what can actually be seen, which explains why the "RVR" value you get from ATC is NOT the Runway Visual Range as actually defined.

[OhNoCB]

Stop descending, climb if necessary to the (initial) missed approach altitude, continue the lateral element of the approach to the Mapt and then follow the published missed approach.

Alternatively, begin the above procedure and then do what ATC tells you to.

[HEATHROW DIRECTOR]

<<which explains why the "RVR" value you get from ATC is NOT the Runway Visual Range as actually defined.>>

Where is RVR defined then please? The values passed by ATC at larger airfields are measured electronically at three points along the runway and I'm not sure you could get any more accurate than that.