What color is used to signify obstacles within a helicopter landing zone?

The use of specific colors to signify obstacles within a helicopter landing zone is critical for ensuring safety and effective operations. Steady Red is the correct choice because it is universally recognized in aviation and ground operations as an indication of danger or obstacles that must be avoided. This color alerts pilots and ground crew to the presence of hazards that could interfere with safe landings.

In the context of helicopter operations, maintaining awareness of obstacles is essential for preventing accidents and ensuring the landing zone is clear for the aircraft's approach and departure. This standard aligns well with established aviation protocols, where red is consistently understood as a warning signal. Other colors, such as green or blue, typically signify safety or readiness, while yellow can represent caution, but does not specifically indicate obstacles in the same widely recognized way that steady red does.