When is an item on the LZ considered an obstacle?

When is an item on the LZ considered an obstacle?

• A. When it is 6" high, wide, deep, or larger
• B. When it is 12" high, wide, deep, or larger
• C. When it is 18" high, wide, deep, or larger
• D. When it is 24" high, wide, deep, or larger

Answer: (C)

On an LZ, whether something is an obstacle is determined by its size: any item that is 18 inches or more in height, width, or depth within the landing area is considered an obstacle. That threshold shows up because items at or above 18 inches can noticeably affect rotor clearance, rotor wash effects, and pilot visibility during approach and hover. The phrase “18 inches high, wide, deep, or larger” means any dimension reaching or exceeding 18 inches qualifies, so it best matches the standard used in SLICC. Smaller items—those under 18 inches—are generally not treated as obstacles for typical LZ assessments.

On an LZ, whether something is an obstacle is determined by its size: any item that is 18 inches or more in height, width, or depth within the landing area is considered an obstacle. That threshold shows up because items at or above 18 inches can noticeably affect rotor clearance, rotor wash effects, and pilot visibility during approach and hover. The phrase “18 inches high, wide, deep, or larger” means any dimension reaching or exceeding 18 inches qualifies, so it best matches the standard used in SLICC. Smaller items—those under 18 inches—are generally not treated as obstacles for typical LZ assessments.