What does a brown airport represent on a Jeppeson plate?

A brown airport on a Jeppesen plate indicates that there is no Instrument Approach Procedure (IAP) available. This signifies that pilots should not expect the airport to have the necessary procedures for instrument flight rules (IFR) operations, which are essential for safely landing an aircraft in low visibility or adverse weather conditions.

Understanding the significance of a brown airport symbol is vital for flight planning, as it helps pilots make informed decisions regarding where to land based on the availability of instrument procedures. Airports without IAPs may still be operational under visual flight rules (VFR), but pilots must ensure that they can maintain appropriate visibility and cloud clearance as required by VFR regulations.

In contrast, other colors or symbols on the plate represent different statuses or services available at an airport. For instance, airports marked with different colors or symbols might indicate various types of IAP availability, VFR operations, or specific regulations concerning military use or access.