In which type of aircraft is the negative limit load factor specified?

The correct answer is found in the utility category aircraft, as this classification is specifically designed to perform a wider variety of maneuvers compared to normal category aircraft, including some aerobatics. It's essential to specify a negative limit load factor for utility aircraft because these aircraft are often subjected to negative loads during certain flight conditions, such as maneuvers that involve pulling negative Gs.

Utility category aircraft are allowed to experience negative load factors, thus having a specified negative limit load factor is critical for ensuring their structural integrity during operations that might involve such forces.

In contrast, normal category aircraft are primarily intended for general aviation use and typically operate within a range that does not include negative loads, which is why they don't have specified negative limit load factors. Transport category aircraft, designed for commercial flight, also do not engage in operations that would require a negative limit load factor. Experimental category aircraft have different testing and operational regulations, and while they may encounter various load factors, they do not have standard specifications like the utility category aircraft.