AVMG 3600 - Exam 1 Flashcards
Reliability - ANS-A measure of how long a piece of equipment performs its intended
function
- Remember as: mean time between failure (MTBF)
Maintainability - ANS-A measure of the efficiency in restoring functional purpose
- Remember as: Mean time to repair (MTTR)
Availability - ANS-A measure of the ability to perform the intended function over time
- Remember as: Percentage of uptime/total time
Design for Manufacturability - ANS-- Choices that result in a system that is easily and
efficiently manufactured
Design for Maintainability - ANS-- choices that result in a system that is easily and
efficiently restored to its available status
Servicing v. Maintenance - ANS-Servicing: restore materials intended to be consumed
during normal operations
- Ex: refuel, remove waste, adjust settings
Maintenance: the process of ensuring that a system continually performs its intended
function at its designed-in level of reliability and safety.
- Ex: proactive and reactive responses
Reliability Centered Maintenance (RCM) - ANS-- Evaluate mode, likelihood, and the
consequence of a failure happening.
- Focus on the things affecting safety and economic consequences
- Use decision-tree method to determine preventative tasks
Risk Management Approach to Maintenance - ANS-Overall maintenance strategy that is
designed to optimize availability/cost, that views risk in three different ways:
- Prevent: engineering and design solutions (redundancy, reliability)
- Repair High: maintenance solutions (life-limited replacement, on condition)
- Repair Low: maintenance solutions (monitor, replace after failure)
Reliability + Maintainability = ? - ANS-Availability
, Why do we have to do maintenance (entropy analogy)? - ANS-Entropy is always
moving from order to disorder, and reliability is the same way. Over time, parts continue
to wear down, so maintenance is there to combat this.
2 Types of Maintenance: - ANS-- Preventative (scheduled)
- Restorative (unscheduled)
Preventative/Scheduled Maintenance - ANS-- performed at regular intervals
- occurs before the failure/breakdown of a part/system
Restorative/Unscheduled Maintenance - ANS-- performed after system failure or
damage
What is the purpose of redesign? - ANS-You can redesign the engines to reduce the
long-term cost of maintenance to fix them. It fixes the problem, while also remaining
cost efficient.
Role of Engineers v. Mechanics - ANS-Engineers: minimize a system's entropy they are
designing within the required constraint (cost)
Mechanics: combat the continual increase in entropy during the operational lifetime of
the equipment
Systematic Approach - ANS-- Deliberate, step-by-step, methodical linear process that
accomplishes some goal; One step at a time; Same way every time; Predictable,
expected result
- Made up of things like inputs, resources, relationships, outputs, boundaries, systems,
and subsystems
System - ANS-A collection of components designed to work together to efficiently
perform a certain function
What is an example of a complex system of systems? - ANS-Airplane/Aircraft
What are the two approaches to maintenance? - ANS-1. Process-Oriented - specific
maintenance processes that can be applied to any component
2. Task-Oriented - uses predetermined maintenance tasks to avoid in-service failures;
more inclusive of RCM approach; top-down approach
What programs are considered "bottom-up" approaches? - ANS-MSG-1 & MSG-2
Reliability - ANS-A measure of how long a piece of equipment performs its intended
function
- Remember as: mean time between failure (MTBF)
Maintainability - ANS-A measure of the efficiency in restoring functional purpose
- Remember as: Mean time to repair (MTTR)
Availability - ANS-A measure of the ability to perform the intended function over time
- Remember as: Percentage of uptime/total time
Design for Manufacturability - ANS-- Choices that result in a system that is easily and
efficiently manufactured
Design for Maintainability - ANS-- choices that result in a system that is easily and
efficiently restored to its available status
Servicing v. Maintenance - ANS-Servicing: restore materials intended to be consumed
during normal operations
- Ex: refuel, remove waste, adjust settings
Maintenance: the process of ensuring that a system continually performs its intended
function at its designed-in level of reliability and safety.
- Ex: proactive and reactive responses
Reliability Centered Maintenance (RCM) - ANS-- Evaluate mode, likelihood, and the
consequence of a failure happening.
- Focus on the things affecting safety and economic consequences
- Use decision-tree method to determine preventative tasks
Risk Management Approach to Maintenance - ANS-Overall maintenance strategy that is
designed to optimize availability/cost, that views risk in three different ways:
- Prevent: engineering and design solutions (redundancy, reliability)
- Repair High: maintenance solutions (life-limited replacement, on condition)
- Repair Low: maintenance solutions (monitor, replace after failure)
Reliability + Maintainability = ? - ANS-Availability
, Why do we have to do maintenance (entropy analogy)? - ANS-Entropy is always
moving from order to disorder, and reliability is the same way. Over time, parts continue
to wear down, so maintenance is there to combat this.
2 Types of Maintenance: - ANS-- Preventative (scheduled)
- Restorative (unscheduled)
Preventative/Scheduled Maintenance - ANS-- performed at regular intervals
- occurs before the failure/breakdown of a part/system
Restorative/Unscheduled Maintenance - ANS-- performed after system failure or
damage
What is the purpose of redesign? - ANS-You can redesign the engines to reduce the
long-term cost of maintenance to fix them. It fixes the problem, while also remaining
cost efficient.
Role of Engineers v. Mechanics - ANS-Engineers: minimize a system's entropy they are
designing within the required constraint (cost)
Mechanics: combat the continual increase in entropy during the operational lifetime of
the equipment
Systematic Approach - ANS-- Deliberate, step-by-step, methodical linear process that
accomplishes some goal; One step at a time; Same way every time; Predictable,
expected result
- Made up of things like inputs, resources, relationships, outputs, boundaries, systems,
and subsystems
System - ANS-A collection of components designed to work together to efficiently
perform a certain function
What is an example of a complex system of systems? - ANS-Airplane/Aircraft
What are the two approaches to maintenance? - ANS-1. Process-Oriented - specific
maintenance processes that can be applied to any component
2. Task-Oriented - uses predetermined maintenance tasks to avoid in-service failures;
more inclusive of RCM approach; top-down approach
What programs are considered "bottom-up" approaches? - ANS-MSG-1 & MSG-2
