The alternate brake system is powered by the ______ hydraulic system

Question

BlackTom AI · Accepted Answer

The question asks which hydraulic system powers the alternate brake system.
Option B: If the choices include B, it would be tempting to think the alternate brake is tied to the other main hydraulics, but this option is incorrect because the standard alternate brake source is not the B system in this context.
Option standby: The standby hydraulic system typically powers non-primary or backup functions such as instruments or certain actuators, not the primary alternate braking path in this design, so this statement is inaccurate for the alternate brake source.
Option A: This is the correct choice. The alternate brake system is supplied by the A hydraulic system, meaning that the A-side hydraulics provide the pressure and control for the alternate braking function. This aligns with how many aircraft partition braking sources, reserving A-system pressure for alternate or secondary brake pathways when the primary (A or B) system is not available in the normal mode.
Option landing gear transfer unit: The landing gear transfer unit is a mechanical/hydraulic subsystem used for gear retraction/extension and associated operations, not a hydraulic power source for the brake system. Therefore, this option is not describing the brake-source relationship.
In summary, option A identifies the true hydraulic source for the alternate brake system, while options B, standby, and landing gear transfer unit describe functions or sources that do not power the alternate brake in this configuration.

AS 411 Exam 03

The alternate brake system is powered by the ______ hydraulic system

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