If hydraulic systems 1 and 2 fail, can the aircraft still be stopped using the parking brake?

If hydraulic systems 1 and 2 fail, can the aircraft still be stopped using the parking brake?

• A. Yes
• B. No
• C. Only with assistance
• D. Only on ground

Answer: (A)

The parking brake is designed to operate independently from the normal hydraulic systems. It typically uses its own dedicated circuit or an accumulator that stores hydraulic pressure. When you apply the parking brake, that stored pressure can actuate the wheel brakes on the ground, allowing the aircraft to be stopped or held even if hydraulic systems 1 and 2 have failed. This provides a last-resort, ground-based braking capability when the primary systems are unavailable. Remember the pressure is finite, so its effectiveness is limited and should be managed accordingly.

The parking brake is designed to operate independently from the normal hydraulic systems. It typically uses its own dedicated circuit or an accumulator that stores hydraulic pressure. When you apply the parking brake, that stored pressure can actuate the wheel brakes on the ground, allowing the aircraft to be stopped or held even if hydraulic systems 1 and 2 have failed. This provides a last-resort, ground-based braking capability when the primary systems are unavailable. Remember the pressure is finite, so its effectiveness is limited and should be managed accordingly.