bubbers44:
Continuing the approach if minimums go below is allowed in the US if you have intercepted the glideslope or FAF in a non precision approach but going below DH or MDA isn't.
That is mostly correct, except the glideslope can't be intercepted prior to the precision-FAF (ILS) or FAF (NPA) and then apply the rule (FAR 121.651 (c) ). The intercept has to be at the official P-FAF point designated on the chart.
121.651 (c) If a pilot has begun the final approach segment of an instrument approach procedure in accordance with paragraph (b) of this section, and after that receives a later weather report indicating below-minimum conditions, the pilot may continue the approach to DA/DH or MDA. Upon reaching DA/DH or at MDA, and at any time before the missed approach point, the pilot may continue the approach below DA/DH or MDA if either the requirements of § 91.175(l) of this chapter, or the following requirements are met...