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Hydraulic Fluid Types and Specifications

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Hydraulic Fluid Types and Specifications

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Questions and Answers

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?

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?

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?

BMS Signup and view all the answers

Which option correctly states the mixing capabilities of hydraulic oils?

Only mineral oils from different manufacturers can be mixed. Signup and view all the answers

What is the primary purpose of the depressurizing valve in a reservoir?

To allow maintenance by depressurizing the reservoir Signup and view all the answers

Where is the depressurizing valve typically located?

At the ground service panel Signup and view all the answers

What is the function of a bleed valve in a hydraulic system?

To depressurize the system for maintenance and safe operation Signup and view all the answers

What happens when the depressurizing valve is operated?

Pressure is relieved to allow safe maintenance Signup and view all the answers

Why is it necessary to depressurize the reservoirs?

To safely change system components Signup and view all the answers

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.