The helicopter deck of a MODU must be marked with the unit’s identification, appropriate aiming circles, and a continuous line on the perimeter which is __________.
• 46 CFR Part 108 – especially the sections on helicopter facilities for MODUs • Required markings on helicopter decks (unit ID, aiming circles, perimeter lines) • Differences between typical line widths used on decks vs. helicopter safety markings
• Which option seems most consistent with a high‑visibility safety boundary that can be clearly seen from the air and on approach? • Think about other standard deck marking widths you’ve seen (e.g., walkways, hazard stripes). Are helicopter deck perimeter lines usually narrower or wider than those? • If you picture the size of a person’s boot, which line width would clearly stand out around the entire perimeter of the deck?
• Confirm the specific line‑width requirement in 46 CFR Part 108 for helicopter deck perimeter markings on MODUs • Make sure you are looking at a continuous perimeter line requirement, not letters, numbers, or aiming circle dimensions • Eliminate line widths that are too narrow to be obvious from a helicopter or so wide that they would be impractical to paint around the entire deck
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