RetiredF4
Commencing an approach to an airfield with weather below published minima without the intention to land for practice is a procedure you should be familiar with. Its flown down to the minimum followed by a missed approach procedure. Commercial aviation probably does not do any practice approaches except in the simulator, military jets do practice them.
The same procedure is used for a trial approach. The difference is the intention to land out of it, if the runway environment is in sight prior or at the minimum and landing can be assured.
In the civil world, at least where I work, to prevent people "pushing their luck", we have approach bans.
These mean without the RVR minima being established prior to 1000' / FAF, you cannot continue the approach e.g. if you require 550m RVR for a CAT 1 ILS, and the last info from ATC is 400m, you are breaking the law to continue below 1000'. If below 1000' and it then falls, you can continue.
The only way to play that system is when you get a "satisfactory" RVR to then fail to ask for any more... not only poor practice, but you'll probably get scuppered when it is read out to you unrequested at 1500'!
NoD
NB Cloudbase is
not subject to the same restriction.