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Maintenance Planning


Contact DTB to learn of the impact successful maintenance planning can have on your bottom line.

Maintenance Planning / LORA / Reliability Engineering

Maintenance planning uses analytical methodologies to determine when an item will be replaced, repaired, or discarded based on cost considerations and operational readiness requirements. For a complex systems containing assemblies, sub-assemblies and components organized into several levels of possible repair decisions, DTB systems determine an optimal repair and maintenance criteria aimed to minimize overall system life-cycle costs.

Logistics personnel examine not only the cost of the part to be replaced or repaired but all of the elements required to make sure the job is done correctly. This includes the skill level of personnel, support equipment required to perform the task, test equipment required to test the repaired product, and the facilities required to house the entire operation.

What can maintenance planning do?

  • Define the actions and support necessary to ensure that the system attains the specified system readiness objectives with minimum Life Cycle Cost (LCC)
  • Set up specific criteria for repair, including Built-In Test Equipment (BITE) requirements, testability, reliability, and maintainability; support equipment requirements; automatic test equipment; and manpower skills and facility requirements
  • State specific maintenance tasks, to be performed on the system
  • Define actions and support required for fielding and marketing the system
  • Address warranty considerations
LORA — Level of Repair Analysis

maintenance-3Maintenance planning relies on Level Of Repair Analysis (LORA) as a function of the system acquisition process. LORA is used in the US Department of Defense (DoD) as an analytical methodology to determine when an item will be replaced, repaired, or discarded based on cost considerations and operational readiness.

Conduct a LORA repair analysis to optimize the support system, in terms of LCC, readiness objectives, design for discard, maintenance task distribution, support equipment and ATE, and manpower and personnel requirements.

For a complex engineering system containing thousands of assemblies, sub-assemblies, components, organized into several levels of indenture and with a number of possible repair decisions, LORA seeks to determine an optimal provision of repair and maintenance facilities to minimize overall system life-cycle costs.

Logistics personnel examine not only the cost of the part to be replaced or repaired but all of the elements required to make sure the job is done correctly.


Reliability is defined as the probability of failure, the frequency of failures or, in terms of availability, a probability derived from reliability and maintainability. Maintainability and maintenance may be defined as a part of reliability engineering.

“Reliability is, after all, engineering in its most practical form.” — James R. Schlesinger, Former US Secretary of State for Defense.

Reliability Engineering

Reliability plays a key role in cost-effectiveness of systems. Reliability engineering is an engineering field that deals with the study, evaluation, and life-cycle support of a system or component to perform under stated conditions for a specified period of time.

Reliability engineering for complex systems requires a different, more elaborate systems approach than for non-complex systems. Reliability analysis has important links with:

  • Functional analysis
  • Storage
  • Specification requirements
  • Spare parts
  • Information delivery
  • Operations research
  • Manufacture / quality
  • Human factors
  • Maintenance
  • Technical documentation
  • Transport
  • Work skills training

Effective reliability engineering requires experience, broad engineering skills and knowledge from many different fields of engineering. Reliability engineering focuses on costs of failure caused by system downtime, cost of spares, repair equipment, personnel and cost of warranty claims.