Aircraft Hydraulic System Maintenance Quiz and Flashcards

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Questions and Answers

Where is the return line filter typically located in a hydraulic system?

At the output side of the hydraulic pump

At the end of the supply line

At the midpoint of the return line (correct)

At the input side of the hydraulic pump

What is the primary goal of a preventive maintenance program for a hydraulic system?

To reduce the complexity of the system

To eliminate most hydraulic component failures (correct)

To increase the system's operating frequency

To ensure minimum flow and pressure during operation

What is the primary function of the hydraulic fluid in an aircraft hydraulic system?

To cool the system components

To transmit energy in the system (correct)

To lubricate the system components

To generate pressure in the system

What is a common pitfall in many organizations' preventive maintenance procedures?

Not requiring maintenance personnel to follow the procedures Signup and view all the answers

What is the minimum auto-ignition temperature of most aviation hydraulic fluids?

475 degrees C Signup and view all the answers

What is the first step in developing a preventive maintenance program for a hydraulic system?

Identify the system operating condition Signup and view all the answers

What is a critical property of hydraulic fluids used in aircraft hydraulic systems?

High flash point Signup and view all the answers

What is the primary characteristic of a preventive maintenance program?

It is performance-oriented Signup and view all the answers

Why are phosphate esters used as hydraulic fluids in aircraft systems?

Because they are very difficult to ignite at room temperature Signup and view all the answers

What is the primary benefit of a well-implemented preventive maintenance program for a hydraulic system?

Elimination of most hydraulic component failures Signup and view all the answers

What is a challenge in designing aircraft hydraulic systems?

Operating efficiently over a broad temperature spectrum Signup and view all the answers

What is the primary role of hydraulic systems in various applications?

To transfer high forces rapidly and accurately over a long distance Signup and view all the answers

What is the basic principle of hydraulics as stated by Pascal's Law?

Pressure applied to any part of a confined fluid transmits to every other part with no loss Signup and view all the answers

What is the recommended approach to developing a preventive maintenance program for a hydraulic system?

Develop a program based on the system's operating condition Signup and view all the answers

What is the formula to calculate hydraulic pressure?

Pressure = Force / Area Signup and view all the answers

What is the characteristic of hydraulic pressure in a confined fluid?

It acts with equal force on all equal areas of the confining walls and perpendicular to the walls Signup and view all the answers

What is the purpose of including environmental concerns in a Preventive Maintenance procedure?

To identify potential hazards to the environment Signup and view all the answers

What is the application of more powerful and accurate hydraulic systems?

In maneuvering huge ships Signup and view all the answers

What is the primary focus of the 5th step in creating a Preventive Maintenance program for a hydraulic system?

Analyzing the equipment's history to verify maintenance procedures Signup and view all the answers

What is the purpose of including a list of safety precautions in a Preventive Maintenance procedure?

To minimize the risk of accidents and injuries during maintenance Signup and view all the answers

What is the primary benefit of having a comprehensive Preventive Maintenance program for a hydraulic system?

Ensuring the reliability and longevity of the hydraulic system Signup and view all the answers

What is the purpose of specifying the store room number for parts and materials in a Preventive Maintenance procedure?

To facilitate the identification and retrieval of necessary parts and materials Signup and view all the answers

What is the primary goal of a Preventive Maintenance program for a hydraulic system?

To prevent unexpected failures and reduce downtime Signup and view all the answers

What is the advantage of hydraulic systems in terms of pipe size and weight?

They can transfer high forces rapidly and accurately even in small pipes of light weight Signup and view all the answers

What is the common approach to hydraulic system maintenance in most companies?

Allowing the hydraulic system to control maintenance at a higher cost Signup and view all the answers

What is the recommended percentage of hydraulic troubleshooters in a maintenance workforce?

10% or less Signup and view all the answers

What is the primary role of general hydraulic maintenance personnel?

Conducting preventive maintenance procedures Signup and view all the answers

What is the primary goal of a preventative maintenance approach to hydraulic systems?

Developing a proactive maintenance strategy Signup and view all the answers

What is the importance of having 'hydraulic knowledge' in maintenance?

It is power in hydraulic maintenance Signup and view all the answers

What is the expected outcome of implementing a preventative maintenance approach to hydraulic systems?

Reduced maintenance costs and increased system performance Signup and view all the answers

Study Notes

Hydraulic System Components

A return line filter is located at the input side of the hydraulic pump and cleans out any contamination in the hydraulic fluid at the end of the return line.

Hydraulic Fluid Properties

Hydraulic fluid should have a high flash point to prevent ignition in case of a leak.
Special hydraulic fluids with fire-resistant properties have been developed for aviation use, such as phosphate esters.
These fluids are difficult to ignite at room temperature but can sustain combustion if heated to temperatures above 180°C.
The auto-ignition temperature of most aviation hydraulic fluids is in the range of 475°C.
Hydraulic fluid should have adequate viscosity to work efficiently over a broad temperature spectrum.

Preventive Maintenance

Preventive maintenance is essential to eliminate most hydraulic component failures.
A preventive maintenance program should be developed and followed to obtain results.
Steps to develop a preventive maintenance program include:
- Identifying the system operating condition.
- Determining the equipment manufacturer's requirements for preventive maintenance.
- Identifying the component manufacturer's requirements for hydraulic fluid and filters.
- Reviewing equipment history to verify the above procedures.

Preventive Maintenance Procedures

Procedures must be written for each PM task and must be accurate and understandable by all maintenance personnel.
The PM job plan should include:
- Tools or special equipment required.
- Parts or material required with store room number.
- Safety precautions and environmental concerns.
A list of preventive maintenance tasks for a hydraulic system could include:

Hydraulic System Principles

Pascal's Law states that "Pressure applied to any part of a confined fluid transmits to every other part with no loss."
Pressure acts with equal force on all equal areas of the confining walls and perpendicular to the walls.
Hydraulic pressure can be defined as the force exerted by a fluid on unit area, anywhere on the surface within the container.

Hydraulic Knowledge

Hydraulic knowledge is essential for effective maintenance.
It is recommended to divide hydraulic skill into two groups:
- Hydraulic troubleshooters (10% or less of maintenance workforce) who are experts in maintenance.
- General hydraulic maintenance personnel (90% or more) who provide preventive maintenance expertise.

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Description

Test your knowledge of hydraulic systems used in aircraft maintenance, including their application in steering and maneuvering devices. Learn how Pascal's Law is applied in these systems to transfer high forces rapidly and accurately.

Aircraft Maintenance Technology: Hydraulic Systems

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