The slope limitation for landing and stopping the rotor is 10 degrees. With ESS installed, avoid which type of landings due to minimal ground clearance?

• A. 10 degrees, nose up slope landings
• B. 6 degrees, crosswind landings
• C. 15 degrees, side slope landings
• D. 10 degrees, nose down slope landings

Answer: (A)

When landing on a slope, keeping enough ground clearance for the rotor and fuselage as you stop the rotor is crucial. The limit is 10 degrees, but installing ESS reduces forward ground clearance. A nose-up attitude on a 10-degree slope puts the forward part of the helicopter closer to the ground as the rotor is brought to rest, increasing the risk of contact. That’s why nose-up slope landings on the 10-degree limit should be avoided with ESS installed. The other options either stay within the slope limit (6-degree crosswind landings) or exceed it (15-degree side-slope landings), or involve a nose-down attitude at 10 degrees, which doesn’t present the same clearance issue.