130 Questions
What is the underlying or fundamental cause of a problem known as?
Root cause
Which type of fault is characterized by symptoms being present at all times?
Hard fault
What kind of fault is difficult to isolate because it may not show symptoms at the time of checking?
Intermittent fault
If a gas turbine engine is not producing enough power, what would be considered the cause of this issue?
Root cause
What is a symptom in relation to a fault?
'Symptom' is evidence showing something is wrong.
Why are intermittent faults often difficult to isolate?
Because they require knowledge of system operation.
What does 'fault finding' in aircraft systems refer to?
Detecting and isolating faults
What is the significance of knowledge of the system in fault detection?
It helps in determining if a system is operating within its parameters
What is the definition of 'fault isolation' in aircraft systems?
Determining the cause of the fault
How is 'fault rectification' related to fault finding?
It involves replacing or repairing a system
What does a 'fault' in an aircraft system signify?
An unexpected change or malfunction in a system or component
What is the purpose of 'troubleshooting' in aircraft systems?
Returning the system to a correctly operating state
What is an example of an intermittent fault?
A warning light that comes on briefly then goes out
What characterizes random faults?
They can be present sometimes and absent at other times
What is a prerequisite for effective fault finding?
Understanding how a system operates
Why are random faults considered the most difficult to isolate?
Because they combine characteristics of hard and soft faults
What percentage of time is typically spent on identifying a fault?
The majority of the time
Why are skills like operating the system and using support equipment important for effective fault finding?
To quickly return aeronautical equipment to serviceable state
In the half-split fault finding process, what is the next step after one of the halves identifies the fault?
The faulty half is further split in two.
In the linear system described in Figure 5, at which point is it logical to assume the fault occurs before if there is no output at point 'B'?
2
What component would be considered at fault if there is no output at point 1 in the linear system?
A
Which step follows after splitting the system into two halves according to the half-split fault finding process?
Checking each half individually for faults.
If there is no output at point 'D' in the linear system, where should the next check be made according to the half-split rule?
2
What should be assumed if there is no output at point 'B' and then no output at point 1 in the linear system?
'A' is at fault.
Which component would be inferred as faulty if there is no output at component 'D' and then no output at component 'A'?
'A'
What type of fault may occur in flight but be absent on the ground?
Intermittent fault
Which type of fault is a combination of 'hard' and 'soft' faults and is considered the most difficult to isolate?
Random fault
Why are skills like understanding how a system operates important for effective fault finding?
To isolate random faults
What is a key prerequisite for effective fault finding that allows technicians to use technical publications?
Skills and knowledge
Which type of fault is characterized by not following a set pattern and can be present sometimes and absent at other times?
Random fault
Which of the following is NOT a prerequisite for effective fault finding?
Ignorance of the system's history
Which of the following is NOT a step in the half-split fault finding process?
Ignoring the non-faulty half
Which of the following is NOT a type of fault?
Predictable faults
Which of the following is NOT a factor that affects fault finding?
Ignorance of the system's history
Which of the following is NOT an element of a simple system?
Complexity
Which of the following is NOT a way to gather data for analysis as part of the fault finding process?
Ignoring the symptoms
What is the first step in confirming that a fault exists in a system?
Operating the system
What is an essential prerequisite for successful and safe fault finding?
Ability to follow instructions laid down in technical publications
What is required to differentiate between normal and abnormal system operation?
Understanding of theory of operation
What is the purpose of operating a system during fault finding?
To confirm that a fault exists
What is the role of technical publications in fault finding?
They provide instructions for fault finding procedures
What is the significance of system knowledge in fault detection?
It helps in differentiating between normal and abnormal system operation
What can be saved through preventing unnecessary use of spares, personnel, and facilities in fault finding?
Cost and resources
What is the primary benefit of adopting a systematic approach to fault finding?
Saving time and resources
When referring to 'fault rectification' in the fault finding process, what type of actions may be taken?
System component replacement or repair
Why is knowledge of the system essential for technicians during fault finding?
To identify the system operating within parameters
In fault finding, what does 'troubleshooting' emphasize?
Returning the system to a correctly operating state
What does 'fault isolation' specifically refer to in the context of fault finding?
'Determining the cause of the fault'
What makes random faults the most difficult to isolate?
They are a combination of 'hard' and 'soft' faults.
Why is knowledge of system operation and use of support equipment essential for effective fault finding?
To apply a systematic approach when identifying faults.
What is significant about the skills required in fault finding due to strict time constraints?
They become particularly important.
Why are random faults considered a unique challenge in fault finding?
They do not follow a predictable pattern.
What aspect of random faults makes them different from other types of faults?
They can be present sometimes and absent at other times.
How do random faults differ from intermittent faults?
'Random' faults do not have a set pattern of occurrence.
Which of the following is NOT a factor that can affect the fault finding process?
Operator Fatigue
What is the impact of extreme temperatures and pressures on technical equipment?
It causes the performance of systems and support equipment to degrade
What is the role of temperature-sensitive equipment in the fault finding process?
Temperature-sensitive equipment requires standard temperature and humidity for valid test results
Which of the following is NOT a factor to consider when evaluating the working environment?
Equipment availability
What is the purpose of Test and Measuring Equipment (T&ME) in the fault finding process?
T&ME is designed to operate in controlled environments with precise temperature, pressure, and humidity requirements
What is the impact of the working environment on the efficiency and effectiveness of the fault finding task?
The working environment degrades the efficiency and effectiveness of the fault finding task
What is the term that denotes changes inserted into a system, which activates or modifies a process?
Input
What is a set of interrelated tasks that transform inputs into outputs in a system?
Process
What is the term denoting changes which exit a system and activate or modify a process?
Output
What type of feedback aids the input in a system?
Positive
What is the term used to describe the point where the feedback and input combine in a system?
Summing point
What type of system is illustrated in Figure 2, which consists of inputs, a process, and an output?
Open loop system
What is the primary function of a system in an aircraft?
To perform a specific task efficiently
What happens if a component is removed from a system?
The system will fail to function
What is the role of communication in fault finding?
To improve the efficiency of fault finding
What is a system hierarchy?
A system that is made up of parts known as sub-systems
What is the importance of understanding the team's goal in fault finding activities?
To avoid accidents and incidents
What is an example of a system in an aircraft?
A collection of components designed to work together
What is a system interface in the context of complex aircraft systems?
A physical connection between two systems or elements
What is required to ensure valid test results when using ground support or test and measuring equipment?
Performing regular calibration checks
What is the significance of system boundaries in complex aircraft systems?
They define the responsibilities for fault finding
What is an example of a system interface in a flight control system?
A mechanical connection between the control surfaces and actuators
What can cause a system fault in complex aircraft systems?
All of the above
What is required for effective fault finding in complex aircraft systems?
All of the above
What is the primary difference between hard faults and intermittent faults?
Hard faults have symptoms present at all times, while intermittent faults are not always present.
In fault finding, what type of fault is characterized by symptoms that may not be visible during checks due to the system working to specifications at that time?
Intermittent fault
Why are intermittent faults often difficult to isolate?
They do not show symptoms consistently, making them hard to identify.
What is the most likely course of action when dealing with an intermittent fault that is not currently manifesting symptoms?
Apply knowledge of system operation and replace the most likely faulty component.
Which type of fault is considered the easiest to isolate because its symptoms are present at all times?
Hard fault
What distinguishes a random fault from other types of faults?
Random faults have symptoms that occur unpredictably.
What is the primary human sense used in fault detection?
Sight
What percentage of faults can be detected visually through observation?
80%
Which sense is commonly used to detect an abnormal noise in a fault detection process?
Hearing
What is an example of a fault symptom that may be detected by the aural sense?
Noisy bearings
What is the role of the aural sense in fault detection?
Detecting abnormal noises
What is the percentage of learning achieved through sight, according to statistics?
80%
What is an effective fault finding technique that can be used to isolate faults?
Elimination through checking and testing
Which of the following senses can be useful in identifying faults in aircraft systems?
Touch
What is an example of a fault that may not be immediately visible but can be detected using the sense of smell?
Overheated components
What is one way to duplicate a fault in aircraft maintenance documentation (AMD)?
Duplicating the unserviceability as recorded in AMD
What is the importance of using a combination of tools and techniques in fault finding?
It can be very effective at isolating faults
Which of the following techniques can be used to isolate faults in aircraft systems?
All of the above
What aspect of the fault finding process does the tactile sense help with?
Identifying overheated components
Which of the following is NOT a fault finding tool or technique mentioned in the text?
Logic gates
What is the main purpose of using fault finding techniques like checking and testing?
To prevent the use of guess-work in fault finding
Which of the following senses can be useful in detecting faults such as cabin air contaminated by engine oil?
Smell
Among the listed tools and techniques, which one relies on using system boundaries effectively?
Flow charts
What differentiates an effective fault finding process from one that involves 'guess-work'?
Reliance on checking and testing
What is the main purpose of Test and Measuring Equipment (T&ME) in the fault finding process?
To diagnose and locate faults
Which fault finding technique involves splitting the system into two halves?
Half-split fault finding process
What is the primary benefit of adopting a systematic approach to fault finding?
It saves time and resources
What is a common challenge when dealing with intermittent faults?
They do not show symptoms at the time of checking
What is the term used to describe the underlying or fundamental cause of a problem?
Root cause
What is the main emphasis of troubleshooting in fault finding?
Returning the system to a correctly operating state
What is a crucial step in effectively using support equipment during fault finding?
Reading the technical publication procedures
Which approach is essential for fault finding in increasingly complex aircraft systems?
Systematic approach
What significant role does experience play in fault finding?
Experience is valuable when encountering similar faults
How can a positive outlook contribute to fault finding in challenging conditions?
By being an important contributor to fault finding
What is a common issue with random faults that makes them difficult to isolate?
Random faults do not follow a set pattern
Which approach is recommended for developing fault finding skills?
Using a systematic approach
What type of fault is characterized by symptoms being present at all times?
Hard fault
Which type of fault is most difficult to isolate due to its inconsistent presence?
Intermittent fault
What is the term used for the underlying or fundamental cause of a problem?
Root cause
In fault localization, what type of fault may require the replacement of the most likely component causing the issue?
Intermittent fault
Which classification of faults poses challenges due to their inconsistent and unpredictable occurrence?
Random faults
What distinguishes an intermittent fault from a hard fault?
Duration of symptoms
What is the next step after one of the halves identifies the fault in the half-split fault finding process?
The faulty half is further split in two.
In a linear system with components A, B, C, and D, if there is no output at point 1 after a fault is suspected before point 2, which component is likely to be the fault?
Component A
What is the significance of splitting the system into two halves at point two in the fault localisation technique?
To narrow down the area where the fault might be present.
What is the logical assumption if there is no output at point B after splitting the system at point 2?
'A' is functioning correctly.
What type of fault can be present sometimes and absent at other times, making it a combination of 'hard' and 'soft' faults?
Random fault
In fault finding, what is an example of an intermittent fault?
A warning light that briefly comes on and then goes out
Why are random faults considered the most difficult type of faults to isolate?
They are a combination of 'hard' and 'soft' faults
What is a key characteristic of an intermittent fault?
It may not be visible at all times
Which prerequisite is crucial for effective fault finding as it involves applying a structured method to identify faults?
Understanding how a system operates
What distinguishes an intermittent fault from a random fault?
Intermittent faults are unpredictable, while random faults are consistent
Test your knowledge on root cause analysis by identifying causes, symptoms, and preventive measures for faults. Understand the importance of determining the underlying issues to prevent future occurrences. Example scenarios like a gas turbine engine not producing enough power will be covered.
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