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

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What distinguishes alternate brakes from reserve brakes?

Alternate brakes can work independently, while reserve cannot
Alternate brakes are for normal brake system loss, reserve is for fluid quantity issues
Alternate brakes require manual activation, whereas reserve does not
Alternate brakes are fully electric, reserve brakes are hydraulic

The correct answer is: Alternate brakes are for normal brake system loss, reserve is for fluid quantity issues

The distinction between alternate brakes and reserve brakes is fundamentally based on their intended use and operational context. Alternate brakes are specifically designed to take over when there is a loss of the normal brake system, serving as a backup to ensure that braking capability is maintained under those circumstances. On the other hand, reserve brakes primarily address issues related to fluid availability, stepping in when there is a deficiency in the braking system's fluid quantity, which might impair normal brake operation. This understanding aligns with the role alternate brakes play in maintaining braking function during malfunctions of the primary system, whereas reserve brakes ensure that there is sufficient fluid to operate brakes when needed. Each has its specific application in aviation safety, designed to handle different scenarios that may affect the braking power of an aircraft.