If you get more than 1 dot low on the glideslope during an ILS approach, which applies?

During an ILS (Instrument Landing System) approach, monitoring the glideslope is crucial for maintaining the correct vertical path towards the runway. When you observe indications that you are more than 1 dot low on the glideslope, such as from the glideslope indicator, it signifies that you are descending too rapidly or have not achieved the proper descent angle.

Choosing to descend to the Minimum Descent Altitude (MDA) only if you are established on the localizer and have passed a specific fix (often the final approach fix, or FAF) is a sound strategy in such a situation. This ensures that you have at least aligned yourself laterally with the runway before making the decision to descend further. It aligns with maintaining situational awareness and ensuring that the aircraft is in the right position to continue the approach safely.

If you are significantly low on the glideslope, it is important to adhere to safe practices rather than continuing the descent blindly, which can lead to unsafe situations or a missed approach if not properly managed. Therefore, waiting until you are properly established before continuing your approach helps ensure safety during landing operations.