Which light pattern has a 10-meter distance between the base light and directional light?

• A. Inverted Y
• B. T
• C. Cross
• D. Circle

Answer: (B)

Think of how these signaling patterns communicate position and direction to the helicopter crew. Each pattern defines where the two lights—the base light and the directional light—sit relative to one another, so the signal is quickly recognizable at a distance. The 10-meter separation is specific to the T configuration, creating a distinctive silhouette that observers interpret as the intended signal. That fixed spacing helps ensure the helicopter crew reads the signal correctly in the field. Other patterns place the lights in different geometries and do not use this same 10-meter gap, so they wouldn’t match the pattern described by the question.