FAA Aircraft Dispatcher Complete Practice Exam

The main gear brakes are powered by Hydraulic System A in the Boeing 727. This system is designed to provide reliable force necessary for braking during landing and taxiing operations. Hydraulic System A is dedicated to critical flight operations, and its design ensures that the main gear brakes operate effectively under normal conditions, contributing to the overall safety and performance of the aircraft during these phases of flight. This configuration aligns with typical hydraulic system designs in many aircraft, where the primary braking system is linked to a specific hydraulic source to ensure redundancy and reliability in braking performance.

In contrast, the other options relate to functions either not fully powered by Hydraulic System A or powered by a different hydraulic system. Fuel pumps, for example, may rely on different systems for operation, while the landing gear operates with contributions from multiple hydraulic systems for operational resilience. Flaps and slats are also typically powered by another designated hydraulic system to ensure that each system has enough pressure and redundancy throughout various aircraft operational phases.