FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

Question: 1 / 1030

Which seals are used with petroleum base hydraulic fluids?

Silicone and Teflon

Synthetic rubber and Neoprene rubber

Petroleum based hydraulic fluids require seals that are resistant to oil and swelling, which makes options A, C, and D incorrect. Silicone and Teflon are not compatible with petroleum fluids and can cause leakage or failure. Viton and PTFE are also not recommended for use with petroleum fluids due to their tendency to swell and degrade. Nylon and PVC are not suitable for use with oil as they can deteriorate and cause leakage. Therefore, synthetic rubber and Neoprene rubber are the most appropriate options for use with petroleum based hydraulic fluids.

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Viton and PTFE

Nylon and PVC

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