Improper loading of a helicopter which results in exceeding fore or aft CG limits is hazardous due to the....

Improper loading of a helicopter which results in exceeding fore or aft CG limits is hazardous due to the....

• A. Reduced lift due to drag.
• B. Degraded rotary wing stability.
• C. Reduction or loss of effective cyclic pitch control.
• D. Increased fuel consumption.

Answer: (C)

The key idea is how the helicopter’s weight distribution affects the pilot’s ability to control pitch with the cyclic. In a helicopter, the cyclic changes blade pitch as the rotor spins to tilt the rotor disk and produce forward or aft motion. If the center of gravity is too far forward or too far aft, the rotor system’s geometry relative to the mass center changes, so the same cyclic input creates a smaller pitching moment than normal. In other words, the available cyclic control authority is reduced, or you can even lose effective cyclic response. This makes it harder to maintain or change pitch as needed, which is especially dangerous during hover or maneuvering. Other options aren’t the direct hazard here: loading won’t primarily cause lift loss from drag or significantly increase fuel consumption, and while stability can be affected, the most specific hazard tied to exceeding fore/aft CG limits is the reduction or loss of effective cyclic pitch control.

The key idea is how the helicopter’s weight distribution affects the pilot’s ability to control pitch with the cyclic.

In a helicopter, the cyclic changes blade pitch as the rotor spins to tilt the rotor disk and produce forward or aft motion. If the center of gravity is too far forward or too far aft, the rotor system’s geometry relative to the mass center changes, so the same cyclic input creates a smaller pitching moment than normal. In other words, the available cyclic control authority is reduced, or you can even lose effective cyclic response. This makes it harder to maintain or change pitch as needed, which is especially dangerous during hover or maneuvering.

Other options aren’t the direct hazard here: loading won’t primarily cause lift loss from drag or significantly increase fuel consumption, and while stability can be affected, the most specific hazard tied to exceeding fore/aft CG limits is the reduction or loss of effective cyclic pitch control.