FAA Aircraft Dispatcher Practice Exam

In the event of a B system failure, how do the brakes function?

1. They are inoperative

2. Using hydraulic pressure from the A system

3. With manual emergency brakes

4. By using an alternate brake system

The correct answer is: Using hydraulic pressure from the A system

In the event of a B system failure, the brakes can still function using hydraulic pressure from the A system. Aircraft braking systems are typically designed with redundancy to ensure safety in the event of a failure in one of the hydraulic systems. The A system can provide the necessary hydraulic pressure to operate the brakes, allowing the pilot to maintain control over the aircraft during landing or ground operations despite the B system's failure. This design helps enhance safety, as it allows the aircraft to be brought to a stop without completely losing braking capability when one system is compromised. Other options, while they discuss alternative methods of braking, do not represent the most direct and immediate means of continuing brake function during a B system failure. Using manual emergency brakes or an alternate brake system might require additional steps or may not be available on all aircraft, making reliance on hydraulic pressure from the A system a more standard and preferred method.