Approximately, how many brake applications are available when operating on accumulator brakes?

Approximately, how many brake applications are available when operating on accumulator brakes?

• A. Seven
• B. Five
• C. Nine
• D. Six

Answer: (A)

The concept being tested is how much stored energy the brake accumulators provide when normal hydraulic pressure isn’t available. On the A320, the brake accumulators are charged to give a finite number of brake applications, enough for a controlled deceleration if hydraulic power is lost. This stored energy is consumed with each application, so the system is designed to offer about seven brake applications in total. That approximate figure is used because the exact number can vary with factors like brake wear, temperature, and how aggressively the brakes are applied. Five or six would understate the available reserve, making it harder to manage a stop in an abnormal situation, while nine would overstate what the energy reserve can reliably deliver. So seven is the best-fit estimate for how many brake applications you get from accumulator brakes.

The concept being tested is how much stored energy the brake accumulators provide when normal hydraulic pressure isn’t available. On the A320, the brake accumulators are charged to give a finite number of brake applications, enough for a controlled deceleration if hydraulic power is lost. This stored energy is consumed with each application, so the system is designed to offer about seven brake applications in total. That approximate figure is used because the exact number can vary with factors like brake wear, temperature, and how aggressively the brakes are applied. Five or six would understate the available reserve, making it harder to manage a stop in an abnormal situation, while nine would overstate what the energy reserve can reliably deliver. So seven is the best-fit estimate for how many brake applications you get from accumulator brakes.