FAA AMT Airframe Practice Exam 2026 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

Phosphate ester base hydraulic fluid is very susceptible to contamination from water in the atmosphere. This type of hydraulic fluid has a strong affinity for water, which can lead to a decrease in the fluid's effectiveness and potentially cause damage to the aircraft's hydraulic system. It is crucial to prevent water contamination in phosphate ester base hydraulic systems to maintain proper functionality and safety. Oil leaks, dust in the environment, and synthetic rubber particles are not the primary contaminants that affect phosphate ester base hydraulic fluid.