General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam 2026 - Free GACA AIP Practice Questions and Study Guide

The correct answer identifies the components powered by the R hydraulic system, specifically mentioning normal brakes, autobrakes, and taxi brake release. The R hydraulic system is typically responsible for providing the necessary pressure and functionality to the braking systems in an aircraft, which are critical for safe operations during landing and ground movements. Understanding the role of hydraulic systems in aircraft is essential, as they are integral to various critical flight functions, particularly in the braking mechanisms.

Normal brakes are essential for decelerating the aircraft during landing, while autobrakes provide an automated means to apply brakes based on selected parameters, enhancing safety and convenience during landings. The taxi brake release function allows the pilot to disengage the brakes for movement on the ground. All these components rely on the R hydraulic system for effective operation, showcasing its importance in overall aircraft safety and performance.

The other options refer to different hydraulic systems or components unrelated to the specific functions of the R hydraulic system. For instance, the components mentioned in the first option relate to flight control systems, the second involves landing gear mechanics, and the fourth pertains to cargo operations and environmental systems within the aircraft. Each of these systems operates on their own designated hydraulic circuits, demonstrating the complexity and specialized nature of an aircraft's hydraulic systems.