FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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Why are backup rings used with O-rings in hydraulic systems above 1,500 PSI?

To increase the O-ring's life

To prevent high pressure from extruding the seal

Backup rings are used with O-rings in hydraulic systems above 1,500 PSI in order to prevent high pressure from extruding the seal. Without a backup ring, the high pressure can cause the O-ring to deform and eventually fail, resulting in hydraulic fluid leakage. The other options, while potentially beneficial in their own ways, do not directly address the issue of preventing extrusion of the O-ring at high pressures. Therefore, they are not as relevant or effective solutions as using backup rings.

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To simplify maintenance

To reduce hydraulic fluid leakage

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