General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

In what scenario would the reserve brakes be used?

1. In the event of normal brakes failure

2. When the aircraft is parked

3. When the C HYD system fluid quantity is too low

4. During the landing phase only

The correct answer is: When the C HYD system fluid quantity is too low

The reserve brakes are specifically designed as a backup system to provide braking capability under certain conditions. They are primarily utilized in the event of a significant hydraulic failure, specifically when the primary hydraulic system fluid quantity is insufficient, which aligns with the scenario described in option C. This situation could occur if there is a loss of fluid in the hydraulic system, which could compromise the effectiveness of the normal braking system. By employing the reserve brakes, pilots can maintain control of the aircraft and ensure safety during critical phases of operation, such as landing or taxiing. The other scenarios do not accurately reflect the primary function of the reserve brakes. For instance, normal brake failure does indicate a need for an alternative braking method, but it's not limited to just the reserve brakes; other emergency braking systems could be employed, such as manual braking if applicable. Additionally, the reserve brakes are not intended for use while the aircraft is parked, as parking brakes would be utilized for that purpose. Lastly, indicating that reserve brakes are used only during the landing phase overlooks their critical role in providing braking capabilities during various operational scenarios, not just landing.