



A navigational lighting system installed at airports to provide visual precision approach path guidance to pilots preparing to land.
The HAPI light indicates the helicopter’s approach altitude status through four distinct lighting modes: Green flashing light: The helicopter is above the optimal approach slope (too high). -Fixed green light: The helicopter is at the correct approach slope. Fixed red light: The helicopter is slightly below the optimal approach slope (slightly low). Red flashing light: The helicopter is below the optimal approach slope (too low).