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

What does the "BRAKE SOURCE" light indicate about brake availability?

1. Only normal brakes are available

2. No braking systems are operational

3. Accumulator pressure is available but not normal or alternate brakes

4. Brakes are working but require maintenance

The correct answer is: Accumulator pressure is available but not normal or alternate brakes

The "BRAKE SOURCE" light indicates that accumulator pressure is available but that neither the normal nor the alternate braking systems are operational. This implies that while there is some level of pressure to potentially allow for braking actions, the primary systems designed for braking are not functioning correctly. In this scenario, it is important for pilots to recognize that relying on accumulator pressure alone may not provide sufficient braking capability, as normal and alternate systems are typically more reliable and effective. Understanding this light’s indication helps ensure that pilots take appropriate precautions and follow standard procedures in the event of a braking system malfunction, potentially including preparing for an alternative means of stopping the aircraft. The other options misinterpret the status of brake systems: one suggests that only normal brakes are available, while another incorrectly states that no braking systems are operational, and the last inaccurately indicates that the brakes are working but need maintenance. Each of these interpretations overlooks the specific condition indicated by the "BRAKE SOURCE" light regarding accumulator pressure and its implications for brake availability.