What is the recommended practice when operating near the highest structure at 400 ft AGL?

What is the recommended practice when operating near the highest structure at 400 ft AGL?

• A. Ascend on the upwind side of the structure and use a 25 ft safety offset.
• B. Descend to below the structure and hover.
• C. Ascend on the downwind side of the structure and utilize a 50 ft safety offset.
• D. Maintain altitude and use a 100 ft safety offset.

Answer: (C)

When you’re operating near the tallest obstacle at 400 ft AGL, you want to maximize your clearance while keeping the ability to react to wind and gusts. Ascending on the downwind side of the structure places you on the side where the wind is moving away from the obstacle, which reduces the chance that gusts or rotor wash will shove the aircraft toward the structure. Pairing that with a 50 ft safety offset gives a solid buffer that’s enough for reliable control without being overly conservative. Descending or hovering below the structure increases collision risk and limits maneuvering room around the obstacle. Maintaining altitude with a larger 100 ft offset is more conservative than necessary and can impede efficient operation.

When you’re operating near the tallest obstacle at 400 ft AGL, you want to maximize your clearance while keeping the ability to react to wind and gusts. Ascending on the downwind side of the structure places you on the side where the wind is moving away from the obstacle, which reduces the chance that gusts or rotor wash will shove the aircraft toward the structure. Pairing that with a 50 ft safety offset gives a solid buffer that’s enough for reliable control without being overly conservative. Descending or hovering below the structure increases collision risk and limits maneuvering room around the obstacle. Maintaining altitude with a larger 100 ft offset is more conservative than necessary and can impede efficient operation.