What does a green airport symbol on a Low IFR chart typically indicate?

A green airport symbol on a Low IFR chart indicates an instrument approach. This symbol signifies that the airport is equipped for and can safely accommodate instrument flight operations, which are necessary when visibility is low or when flying in cloud cover. The presence of an instrument approach means that standardized procedures are established for aircraft to follow when landing, ensuring safety and guidance in controlled airspace.

The green representation highlights that the airport has the appropriate facilities and navigational aids in place to assist pilots in performing these approaches, which typically involve specific altitude and course adjustments according to the instrument flight rules. This is essential for ensuring safe operations in challenging weather conditions where visual references may be limited.

In contrast, the other options point to characteristics not indicated specifically by the green airport symbol. For instance, a landing area could refer to any place aircraft can land, not limited to those with instrument capabilities, while a closed runway would not be represented with a green symbol but rather be indicated in other ways on the chart. The term "public airport only" does not accurately encompass the function of the green symbol, as private airports may also offer instrument approaches and have their own identification markers.