During an ILS approach, what must you do if your GSI indicates two dots above the glide slope?

When the Glide Slope Indicator (GSI) shows two dots above the glide slope during an Instrument Landing System (ILS) approach, it indicates that the aircraft is above the correct glide path. At this point, it is essential not to descend below the localizer minima, which is the minimum altitude prescribed for the approach relative to the localizer signal. Descending below these minima could result in the aircraft being too low during an unstable approach, potentially compromising safety by increasing the risk of terrain or obstacle collision.

Maintaining altitude at this stage allows for proper troubleshooting and assessment of the approach. The pilot can use this time to correct the aircraft's vertical path by slowing down and gradually descending to capture the glide slope without compromising safety. Ultimately, not descending below localizer minima ensures adherence to safe flight protocols while allowing the pilot to stabilize the approach properly.