Given three UH-60L helicopters in a VEE formation and a CH-47D with dual-point, shotgun HUMMWVs using reach pendants at night, with a high elevation of 1020' ASL, a low elevation of 865' ASL, and a Landing Zone length of 2,210 meters, what is the slope on your LZ and does an advisory need to be given?

• A. HE 1020', LE 865', HD 2,210 meters long; Advisory: Yes
• B. HE 990', LE 860', HD 2,210 meters long; Advisory: No
• C. HE 1015', LE 900', HD 2,200 meters long; Advisory: Yes
• D. HE 1020', LE 860', HD 2,210 meters long; Advisory: No

Answer: (A)

In a sling load operation, the slope of the landing zone is found from the rise over the run: the difference between the highest and lowest elevations across the LZ divided by the horizontal distance (with unit conversion as needed), expressed as a percentage.

Here, the high point is 1020' and the low point is 865', giving a rise of 155 feet. The LZ length is 2,210 meters, which is about 7,248 feet. The slope is 155 ft / 7,248 ft ≈ 0.0214, or roughly 2.1%.

With a slope around 2% in this night operation involving a CH-47D dual-point configuration and reach pendants, an advisory is required to inform the aircrew of the LZ gradient and ensure safe approach and siting. The combination that matches the given elevations and LZ length and calls for an advisory is high 1020', low 865', LZ length 2,210 meters, with advisory: Yes.