What is indicated by the lightning bolt symbol on an approach chart?

The lightning bolt symbol on an approach chart specifically indicates the Glide Slope Intercept point. This symbol marks the altitude at which the aircraft should intercept the glide slope, which is essential for maintaining the correct descent path during an instrument approach to landing. The glide slope provides vertical guidance to the pilot, ensuring that the aircraft descends at a safe angle toward the runway.

Understanding this symbol is crucial for pilots as it helps them accurately time their descent and ensures alignment with the glide slope during the final stages of the approach, enabling a safe and controlled landing.

The other options pertain to different aspects of approach procedures, such as missed approach initiation and landing minimums, but they do not represent the function of the lightning bolt symbol. Only the lightning bolt specifically signifies the glide slope intercept, making it a key indicator in the approach process.