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WordPress Shortcode. RobertGoForth3 Follow. Published in: Engineering. Full Name Comment goes here. Are you sure you want to Yes No. Arunkumar Gunasekaran , Mechanical maintenance engineer.
No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. It was their intent to create a document that would allow the use of the NAVAIR process in contract solicitations via the reference of commercial standard. It should therefore be evident that the authors would not have created a document that contradicted their own.
These documents are widely-used RCM documents available. Reliability-Centered Maintenance RCM - Any RCM process shall ensure that all of the seven questions are answered satisfactorily and are answered in the sequence shown as follows: a.
What are the functions and associated desired standards of performance of the asset in its present operating context functions? In what ways can it fail to fulfill its functions functional failures? What causes each functional failure failure modes?
What happens when each failure occurs failure effects? In what way does each failure matter failure consequences? What should be done to predict or prevent each functional failure proactive tasks and task intervals? What should be done if a suitable proactive task cannot be found default actions?
All information and decisions shall be documented in a way which makes the information and the decisions fully available to and acceptable to the owner of the asset. Identify Team and responsibilities 4. Identify and document Review Process 2. Identify analysis items 5. Prioritize Items 6. Equipment Kick-off Meeting 2.
Initial Data Gathering 3. Hardware Breakdown 4. Function 5. Functional Failure 6. Failure Mode 7. Failure Effects 8. Failure Consequences 9. Task Evaluation Task Selection 1. Package Maintenance Task 2. Emergent Issues 2. Age Exploration 3. Hardware Changes 4. It may be that some functions, failures or effects only occur, or occur in a different manner, in certain operational scenarios.
The FMECA should clearly indicate when functions, failure modes or effects are dependent on specific circumstances, environments, or mission phases. It is not necessarily what the item is capable of doing, as shown in the example below. Although most equipment is designed to perform a specific or single function, many systems may perform multiple functions or have secondary functions.
Some functions are "demand" driven, such as an ejection seat, while others operate continuously. Care must be taken to ensure functions are not overlooked, and that the function statement is clear, including any operating context notations. A functional failure may not necessarily be a complete loss of the function.
Proper functional failure descriptions are based on the function description. Functional failures will likely result in either reduced performance or total loss of the system. Separate functional failures should be listed where the effects of less than total loss of the function are different from total loss.
The failure mode statement should include a description of the failure mechanism e. An analysis performed at too high a level will likely become overwhelming as the relationship between functions at the high level and the many failure modes become complicated.
As the effort advances from a high level to progressively lower levels, the number of functions and related failure modes identified will multiply. This eventually will have a stifling effect on the analysis. The target level will normally be a level consistent with the likely level of "on-equipment" maintenance. The analyst can choose to add more failure modes or expound on their descriptions, as necessary, to facilitate the identification of specific inspection and failure detection methods.
This could be done, for example, when applying the analysis process to PHM. Care should be taken, however, that this is done only when required; otherwise, the analysis could experience unnecessary cost and delay. Fundamentals of RCM Analysis. Copyright , Information Spectrum, Inc. Failure modes for items with an existing service history are determined mainly from operators and maintainers and failure data that have been collected.
Descriptive failure data sources such as test reports, engineering investigation reports, hazardous material reports, and depot estimator and evaluator write-ups are useful for determining the failure modes of an item.
A review of Maintenance and Material Management 3-M data is useful to a lesser degree for identifying specific failure modes since, by design, the data is less descriptive. However, 3-M data may be used to identify the types of failure modes seen in-service such as cracks, wear, etc. It can be used as a check to support the notion that the failure modes, which were identified from other sources, are complete.
Maintainers and operators who have first hand experience with the equipment serve as another very useful source of specific failure data. Failure mode identification on new designs is more difficult.
Failure modes have to be inferred from knowledge of the hardware design, general knowledge of how things fail, and experience with similar equipment in similar applications. Data sources will include technical data publications, drawings and failure data sources mentioned above for similar equipment in similar usage. The context in which the equipment is operated should be carefully considered when determining the applicability of generic reliability data.
Furthermore, data covering the results of fatigue, reliability, developmental, and qualification testing are useful for items with or without a service history. A failure effect should be described in terms of physical damage, including both primary and secondary damage that may occur.
It should also address the action required to mitigate the loss of the function during operation. What evidence if any that the failure has occurred in the case of hidden functions, what would happen if a multiple failure occurred b.
What it does if anything to kill or injure someone, or to have an adverse effect on the environment c. What it does if anything to have an adverse effect on production or operations d. What physical damage if any is caused by the failure e. What if anything must be done to restore the function of the system after the failure 9.
First, functional failures are separated into two categories: those that are evident to the crew or operator and those that are not. This means that no other failure or event needs to occur to make the functional failure evident.
Evident failures that have adverse impacts on safety or environmental compliance resulting from the loss of function including any secondary damage that was caused by the occurrence of the failure mode require action on- condition task, hard time task, or other action to avoid unacceptable consequences. All Rights Reserved 5.
Reliability Centered Maintenance (RCM)
The SAE JA Standard on Evaluation Criteria for Reliability Centered Maintenance RCM Process has an interesting background including disappointing and successful stories before its principles were conceived and eventually incorporated into an international engineering standard. There exist international standards on quality ISO 9, , risk ISO 31, , environment ISO 14, and, energy ISO 50, management and many other fields providing information and guidance on the practices, methods and processes designed by groups of highly qualified international experts. Trial and error is no longer acceptable out of the laboratory any more today. But, lessons learned from its practice in conjunction with regretful real-life incidents and accidents provide knowledge on their risks, mitigation and, prevention. Most asset and maintenance management best practices and techniques are standard driven meaning they have been carefully defined and established. Comprehensive time-based maintenance tasks regimes were not able to provide sustainable operations any longer as the commercial aviation industry was about to undergo a major crisis.
An introduction to reliability-centered maintenance
This SAE Standard for Reliability Centered Maintenance RCM is intended for use by any organization that has or makes use of physical assets or systems that it wishes to manage responsibly. RCM is a specific process used to identify the policies which must be implemented to manage the failure modes which could cause the functional failure of any physical asset in a given operating context. This document is intended to be used to evaluate any process that purports to be an RCM process, in order to determine whether it is a true RCM process. This document supports such an evaluation by specifying the minimum characteristics that a process must have in order to be an RCM process.