Podcast
Questions and Answers
What color is mineral oil used as hydraulic fluid?
What color is mineral oil used as hydraulic fluid?
- Blue
- Violet
- Red (correct)
- Green
Which of the following is a characteristic of synthetic hydraulic oil?
Which of the following is a characteristic of synthetic hydraulic oil?
- Cannot be mixed with mineral oil (correct)
- Colored green
- Made from natural substances
- Has the prefix MIL−H 5606
What is the performance requirement of hydraulic oils specified for?
What is the performance requirement of hydraulic oils specified for?
- Their cost-effectiveness
- Their color and viscosity
- Their ability to mix with other fluids
- Their performance through changing conditions (correct)
What prefix is used for synthetic oil specifications in Boeing aircraft?
What prefix is used for synthetic oil specifications in Boeing aircraft?
Which option correctly states the mixing capabilities of hydraulic oils?
Which option correctly states the mixing capabilities of hydraulic oils?
What is the primary purpose of the depressurizing valve in a reservoir?
What is the primary purpose of the depressurizing valve in a reservoir?
Where is the depressurizing valve typically located?
Where is the depressurizing valve typically located?
What is the function of a bleed valve in a hydraulic system?
What is the function of a bleed valve in a hydraulic system?
What happens when the depressurizing valve is operated?
What happens when the depressurizing valve is operated?
Why is it necessary to depressurize the reservoirs?
Why is it necessary to depressurize the reservoirs?
Study Notes
Hydraulic Fluid Types
- Hydraulic fluids transmit force efficiently.
- Mineral oil is a naturally derived hydraulic fluid, typically red in colour.
- All types of mineral oil are compatible and can be mixed.
- Synthetic oil is a man-made hydraulic fluid, typically violet in colour.
- All types of synthetic oil are compatible and can be mixed.
- Mineral and synthetic oil are not compatible and should not be mixed.
Hydraulic Fluid Specifications
- Hydraulic fluids are manufactured to specific performance standards.
- Mineral oil is often specified to MIL-H 5606.
- Synthetic oil is often specified to BMS (Boeing) or NSA (Airbus).
- Common synthetic oil names include Skydrol and Hyjet.
- Oil specifications describe the fluid's performance capabilities across varying conditions.
Reservoir Depressurization
- Each reservoir has a dedicated depressurizing valve, allowing for controlled pressure release.
- Depressurization is essential for maintenance tasks that require access to system components.
- The depressurizing valve is a bleed valve, often located at the ground service panel for convenient access.
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Description
Test your knowledge on the different types of hydraulic fluids, including mineral and synthetic oils. This quiz covers compatibility, color standards, and performance specifications critical for various applications in aviation and other industries. Dive into the details of how these fluids are designed for optimal performance.
