AVMG 3600 - Exam 1 || 100% Correct Answers.
Reliability correct answers A measure of how long a piece of equipment performs its intended
function
- Remember as: mean time between failure (MTBF)
Maintainability correct answers A measure of the efficiency in restoring functional purpose
- Remember as: Mean time to repair (MTTR)
Availability correct answers A measure of the ability to perform the intended function over time
- Remember as: Percentage of uptime/total time
Design for Manufacturability correct answers - Choices that result in a system that is easily and
efficiently manufactured
Design for Maintainability correct answers - choices that result in a system that is easily and
efficiently restored to its available status
Servicing v. Maintenance correct answers 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) correct answers - 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 correct answers 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 = ? correct answers Availability
Why do we have to do maintenance (entropy analogy)? correct answers 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: correct answers - Preventative (scheduled)
- Restorative (unscheduled)
Preventative/Scheduled Maintenance correct answers - performed at regular intervals
- occurs before the failure/breakdown of a part/system
Restorative/Unscheduled Maintenance correct answers - performed after system failure or
damage
What is the purpose of redesign? correct answers 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 correct answers 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
Reliability correct answers A measure of how long a piece of equipment performs its intended
function
- Remember as: mean time between failure (MTBF)
Maintainability correct answers A measure of the efficiency in restoring functional purpose
- Remember as: Mean time to repair (MTTR)
Availability correct answers A measure of the ability to perform the intended function over time
- Remember as: Percentage of uptime/total time
Design for Manufacturability correct answers - Choices that result in a system that is easily and
efficiently manufactured
Design for Maintainability correct answers - choices that result in a system that is easily and
efficiently restored to its available status
Servicing v. Maintenance correct answers 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) correct answers - 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 correct answers 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 = ? correct answers Availability
Why do we have to do maintenance (entropy analogy)? correct answers 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: correct answers - Preventative (scheduled)
- Restorative (unscheduled)
Preventative/Scheduled Maintenance correct answers - performed at regular intervals
- occurs before the failure/breakdown of a part/system
Restorative/Unscheduled Maintenance correct answers - performed after system failure or
damage
What is the purpose of redesign? correct answers 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 correct answers 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
