When would you use a fifth light for inverted Y and where would you place it?

• A. Only if a CH-## aircraft is landing, behind the bottom right light
• B. Only if a CH-## aircraft is landing, in front of the left light
• C. When you need extra visibility, placed at the left stem light
• D. Only during daytime operations, placed near base light

Answer: (A)

The idea behind the fifth light is to provide an extra visual cue specifically for Chinook operations during inverted Y approaches. It’s not a general addition for all helicopters or for daytime use. You’d only deploy this fifth light when a CH-## (Chinook) is landing, because this aircraft benefits from the extra cue given its size and approach characteristics.

Place the extra light behind the bottom-right light so it creates a distinct trailing reference in the Chinook’s approach quadrant. This keeps the light out of the pilot’s direct line of sight while still being visible to help confirm alignment and depth during the approach, especially in limited visibility.

The other options don’t fit because they either propose use for all aircraft, suggest a different placement that wouldn’t provide the intended reference cue, or specify daytime operations where the extra lighting isn’t needed.