FAA AMT Airframe Practice Exam 2025 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

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Question: 1 / 1030

Which seal/material is used with phosphate ester base hydraulic fluids?

Silicone rubber

Nitrile rubber

Polyurethane

Butyl rubber

Phosphate ester base hydraulic fluids can be very aggressive and can cause deterioration in certain types of seals and materials. Butyl rubber is known for its excellent resistance to phosphate ester hydraulic fluids, making it the correct choice in this scenario.

Silicone rubber, nitrile rubber, and polyurethane are not suitable for use with phosphate ester base hydraulic fluids and can degrade when in contact with these fluids.

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