When configuring the inverted "Y" for marking a night PZ/LZ, what is the distance between the directional light and the base light?

When configuring the inverted "Y" for marking a night PZ/LZ, what is the distance between the directional light and the base light?

• A. 7m
• B. 5m
• C. 9m
• D. 12m

Answer: (A)

When you mark a night PZ/LZ with an inverted Y, you’re aiming for a clear, recognizable silhouette from the air. The base light sits on the ground as an anchor, and the directional light is placed at a fixed distance from it so the two lights form the distinctive inverted Y when viewed from above. Seven meters provides the right spatial relationship so the lights appear with the proper angular separation across typical flight paths and viewing angles. If the lights are too close or too far, the shape can look distorted or ambiguous, making it harder for pilots to identify the PZ/LZ accurately. So the correct distance is seven meters.

When you mark a night PZ/LZ with an inverted Y, you’re aiming for a clear, recognizable silhouette from the air. The base light sits on the ground as an anchor, and the directional light is placed at a fixed distance from it so the two lights form the distinctive inverted Y when viewed from above. Seven meters provides the right spatial relationship so the lights appear with the proper angular separation across typical flight paths and viewing angles. If the lights are too close or too far, the shape can look distorted or ambiguous, making it harder for pilots to identify the PZ/LZ accurately. So the correct distance is seven meters.