FAA AMT Airframe Test 2026 – 400 Free Practice Questions to Pass the Exam

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Which seals are used with vegetable base hydraulic fluids?

Buna-N

Silicone

Natural rubber

Natural rubber is the correct answer because it is the only option that is compatible with vegetable base hydraulic fluids. Buna-N and polyurethane are both synthetic materials and may not be suitable for use with vegetable base fluids. Silicone, while compatible with some types of hydraulic fluids, is not recommended for use with vegetable base fluids due to potential swelling and degradation.

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Polyurethane

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