FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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What are the characteristics of MIL-H-7644 hydraulic fluid?

  1. Red color, synthetic base, non-flammable, butyl rubber seals

  2. Blue color, vegetable base, will burn, natural rubber seals

  3. Green color, phosphate ester base, fire resistant, synthetic rubber seals

  4. Yellow color, petroleum base, will not blend, synthetic rubber seals

The correct answer is: Blue color, vegetable base, will burn, natural rubber seals

MIL-H-7644 hydraulic fluid is characterized by having a blue color, a vegetable base, being flammable (will burn), and being compatible with natural rubber seals. This information is essential for aviation maintenance technicians to ensure the proper identification and usage of hydraulic fluids in aircraft systems. Option A is incorrect because MIL-H-7644 is not red in color, does not have a synthetic base, and does not use butyl rubber seals. Option C is also incorrect because MIL-H-7644 does not have a green color, phosphate ester base, or synthetic rubber seals. Option D is incorrect as MIL-H-7644 does not have a yellow color, petroleum base, or synthetic rubber seals.