Which light colors are prohibited for use in helicopter landing zones?

The correct choice indicates that red, blue, and green lights are prohibited for use in helicopter landing zones. This is due to the specific functions and implications of these colors in aviation.

Red is often universally associated with warning signals, and its use can confuse pilots or signal danger when they are approaching a landing zone. Blue lights are typically utilized by law enforcement or emergency vehicles and can create confusion regarding operational boundaries or emergency situations. Green lights are sometimes used for navigation and may signify a safe approach path in other contexts, but their use in an HLZ can also lead to misinterpretation of signals during critical operations.

Using colors effectively is crucial for the safety and efficiency of helicopter operations, and selecting colors that can aid in clear communication with pilots is paramount. Therefore, avoiding red, blue, and green in HLZs helps ensure that pilots receive appropriate and unambiguous visual cues during landings.