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

Which brake systems does the Boeing 777 utilize?

1. Normal brakes and alternate brakes

2. Normal brakes and accumulator brakes powered by R HYD

3. Normal brakes with anti-skid protection only

4. Two independent normal brake systems without anti-skid

The correct answer is: Normal brakes and accumulator brakes powered by R HYD

The Boeing 777 employs a highly sophisticated braking system that includes normal brakes and accumulator brakes primarily powered by the right hydraulic system (R HYD). Normal brakes are activated by the standard hydraulic pressure and provide the necessary stopping force during landing and taxiing. The accumulator brakes serve as a backup system that maintains braking capability in the event of a hydraulic system failure, utilizing pressurized fluid stored in accumulators. This combination ensures a reliable and effective braking system, as it allows for both regular operation under normal conditions and an alternative means of brake application should any issues arise with the primary hydraulic system. The other options do not fully capture the comprehensive nature of the Boeing 777 brake system. While normal brakes are indeed present, the reference to alternate brake systems or solely relying on anti-skid protection is not accurate in describing the full functionality and safety features integrated within the Boeing 777's braking technology.