so located that when the pilot’s seat is over the marking, the whole of the undercarriage will be within the landing area and all parts of the helicopter will be clear of any obstacles by a safe margin.
Definition: Landing Area: A generic term referring to the load-bearing area primarily intended for the landing and take-off of aircraft. The area, sometimes referred to as the Final Approach and Take-Off area (FATO), is bounded by the perimeter line and perimeter lighting.
Think the guy/gal achieved all that, U/C is within the landing area.
Poor wording of the quote, or the definition of "landing area", a bush lawyer could have a field day.
Imagine the result if the U/C wasn't within the landing area, as per the definition of same.