VI. Maintainability and Availability
A. Management strategies
1. Planning (Create)
Develop plans for maintainability and availability that support reliability goals and objectives.
A few words on using available information and resources to efficiently plan for your organization’s maintenance activities.
Additional References
Data to Collect to Optimize Maintenance (article)
Recommended books for Maintenance Reliability Engineering (article)
Quick Quiz
1-113. For which of the following is maintainability an important consideration in design?
(A) computer memory
(B) unmanned satellites
(C) hybrid automobiles
(D) consumer DVD players
(C) hybrid automobiles
Memory, satellites and DVD players are either not cost effective to maintain or repair, or are unavailable to do so. The hybrid automobile is an complex, expensive system with may elements that require regular preventative maintenance, along with being able to perform cost effective corrective maintenance.
1-114. During which phase in a new maintainability program should the most funding be allocated?
(A) initial design and development
(B) demonstration verification
(C) operational
(D) customer service
(A) initial design and development
The idea is to set up and create the right systems for your program that will permit effective and efficient execution of the maintenance program.
1-115. Maintainability of equipment is measured in terms of which of the following?
I. repair time
II. maintenance dollar cost
III. maintenance man-hours
IV. mean time to failure
(A) I and II only
(B) I, II, and III only
(C) II, III, and IV only
(D) I, II, III, and IV
(B) I, II, and III only
MTBF is a poor measure of reliability, not maintainability. All the others are useful to measure a maintainability program.
1-116. Identify the best definition of maintainability.
(A) Maintainability is the probability of a system being restored to functional operation within a given period of time.
(B) Maintainability is the probability of survival of a system for a specified period of time.
(C) Maintainability entails maintaining a piece of equipment in satisfactory working condition.
(D) Maintainability is the performance of adequate maintenance on a system.
(A) Maintainability is the probability of a system being restored to functional operation within a given period of time.
A complete definition is:
The measure of the ability of an item to be retained or restored to a specified condition when maintenance is performed by personnel having specified skill levels, using prescribed procedures and resources, at each prescribed level of maintenance and repair.
1-117. Which of the following is included in preventive maintenance time?
(A) the time needed to repair equipment that has failed
(B) downtime for routine or scheduled tasks to retain an item in operable condition
(C) delay time while awaiting spares from an off-site or remote location
(D) the time needed to obtain spares, make adjustments, and confirm repair success by testing
(B) downtime for routine or scheduled tasks to retain an item in operable condition
All the time listed except the downtime for routine or schedule tasks are part of corrective maintenance time. Gather parts and equipment along with travel time for preventative maintenance do require resources, yet do not count against the downtime of the equipment, unlike when conducting corrective maintenance.
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