What is the required limit maneuvering load factor for a helicopter under 14 CFR Part 27?

The required limit maneuvering load factor for a helicopter under 14 CFR Part 27 is +3.5 to -1.0. This load factor specifies the maximum load the helicopter must be able to withstand during various maneuvers, allowing for safe operation under normal flight conditions.

Understanding why this specific load factor is mandated involves recognizing that helicopters experience different stresses during maneuvers, especially with the rapid changes in direction and alterations in speed. The positive load factor of +3.5 indicates that the helicopter must be able to handle at least 3.5 times its weight during positive maneuvers, providing a margin for safety. The negative load factor of -1.0 ensures that the structure can endure some level of downward force, such as during abrupt descents or negative G maneuvers.

In summary, the requirement for +3.5 to -1.0 reflects the regulatory standards aimed at ensuring structural integrity and passenger safety in helicopters, particularly during various flight conditions. The other options represent load factors that do not align with the regulatory standards set forth in Part 27, reaffirming option C as the correct choice.