What is the minimum size and diameter helicopter for sling load operations?

• A. Size 5, 100 meters
• B. Size 4, 90 meters
• C. Size 6, 120 meters
• D. Size 7, 110 meters

Answer: (A)

Understanding sling load operations requires a helicopter that has enough lifting power and rotor disk area to maintain control and ensure safe clearances for the load. The minimum combination that satisfies these safety margins is a helicopter classified as size five with a rotor diameter of 100 meters. This pair provides the necessary lift and rotor disk area to manage load sway and maintain safe clearance from obstacles and personnel. A smaller airframe (size four) would not meet the required lifting capability, so it isn’t acceptable. Larger options would work, but they’re not the minimum requirement, which is what this question tests.