What is the primary method for pitch control under normal conditions?

The primary method for pitch control under normal conditions in the context of the C-17 involves the use of four elevators, with two on each side. This configuration allows for more effective and responsive control of the aircraft's pitch, providing redundancy and enhanced aerodynamic stability.

Having two elevators on each side increases the surface area for pitch control, allowing for more precise adjustments when maneuvering the aircraft. This setup also enhances the control authority, especially during critical phases of flight such as takeoff and landing, where pitch control is vital for maintaining proper flight attitude and preventing unwanted trims.

Additionally, having four elevators contributes to system redundancy. If one elevator were to become inoperative, the remaining elevators would still provide sufficient control, thus enhancing the overall safety and reliability of the aircraft's handling characteristics. This design is particularly beneficial in ensuring that the C-17 can operate effectively across a diverse range of loading configurations and operational scenarios.

In contrast, a single large elevator surface or just one large stabilizer without an elevator would not provide the same level of control and responsiveness necessary for the C-17's operational requirements.