Reliability Centered Maintenance (RCM) Analysis

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Reliability Centered Maintenance (RCM)
Analysis Last revised 01/14/2011
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Introduction
The Reliability Centered Maintenance analysis is
integrated into the FMECA toolkit, which allows
you to leverage the relational nature of the
FMECA to provide you with identified end effects
and conditional probabilities for each failure
mode in the system. In addition ASENTs FMECA
Manager will allow you to quickly update your
analysis assuring that your results are current
any time failure rates are updated or item
descriptive data (name, part number, description,
etc) is changed. The relationship between failure
modes and effects and the tree structure are
automatically tracked by the toolkit so that
updates can easily be made at any time.
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Selecting the RCM Analysis Method
The first step is to select the RCM analysis
method. This is done in the Session Manager,
which is the first ASENT tool that is invoked.
Select the project you will work on, then select
the RCM method from the RCM Type drop down box.
Click on the Save button.
Now right click on the project and Select FMECA
Manager to enter the FMECA.
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Recommended Methodology
1) Run the Check FMECA utility and resolve any
outstanding problems. 2) From the FMECA Library
Editor, enter any predefined Preventive
Maintenance Tasks into the RCM Task Library. All
that is needed is the task name. 3) Start at the
Assemblies at the bottom of the tree and work
toward the top of the tree. The intermediate
assemblies will have many of the same results and
tasks as the lower level assemblies. 4) Analyze
one failure mode using the questionnaire, based
on the results, add PM tasks as appropriate, and
order the tasks as they should be performed,
entering the interval for the tasks. 5) Copy the
RCM results to any other failure mode where the
same results and tasks apply. 6) Add any notes
unique to any use of a PM task application on a
given failure mode. 7) Generate the RCM reports
and review for content and completeness.
Depending on your situation, there might not be a
need to generate all 7 reports. Generate the
reports on one assembly and refine it to your
satisfaction, then proceed to the next assembly.

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Extensive use of libraries reduces data entry and
errors
Data entry and errors are significantly reduced
by the extensive use of libraries in the
tool. The Notes/Status field allows you to enter
data, comments or notes that will apply to all
uses of the task. The navigation buttons and
their meanings are shown below.
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Starting the Analysis
To begin the analysis, select an assembly and
click on the RCM Tab. The first failure mode
is selected by default, and the RCM results for
this failure mode are displayed above the Failure
Mode Grid. Press the Analyze button to perform
the analysis for this failure mode.
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Analyzing Failure Modes
The RCM Questionnaire displays the System Level
effect for the selected failure mode along with
the severity of the system level effect. The
first set of questions categorizes the
significance (structural or functional) the
Failure Mode contributes to the Assembly. Click
on a check box to answer the question. The next
appropriate question will be presented The
Abort button exits the questionnaire and leaves
the results unchanged. A Back button is
available after the first question to allow you
to back up, in case you answered the previous
question incorrectly.
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Completing the RCM Questionnaire
After the questionnaire has determined the
significance, the set of questions for that type
significance is presented. The questionnaire
will exit when the last appropriate question has
been answered.
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Displaying Copying Results
After the questionnaire is completed, the results
are displayed in the Failure Mode grid and
summarized in the area above the grid. Click in
the RCM Tasks Grid and add Tasks.
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Adding PM Tasks
The task drop down contains all the tasks entered
in the library. Select the task.
Enter the interval that the Task should be
performed. The Prelim Int is the interval when
the system is in use. The Packed Int is when the
system is in storage.
Enter the Maintenance Level (Where the PM
task will be performed).
Select the task type from The drop down list.
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Finalizing PM Data
Once the PM tasks are entered, you can add a
description or note that is unique to this use of
the PM Task By pressing the Edit Task Notes
button or Add Task Desc button. Pressing
either of these buttons opens a panel where you
can enter additional data. (Up to 255 characters)
The red arrows allow you to set the order of the
Tasks as they will appear in the report.
Copying the RCM data, including PM tasks, can
save you a lot of time and effort where the same
result and tasks apply. Press the Copy RCM button
to copy the data.
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Copying RCM Data
To copy RCM data from one failure mode to one or
more other failure modes, select a failure mode
and then click on the Copy RCM button. Next,
select the Assembly to receive the data. The tree
of the present function/phase is presented.
Expand it until the assembly of interest is
displayed.
After selecting the assembly and pressing the
OK button, the failure modes for the selected
assembly are displayed. This is a multiple select
window, with the items in blue being selected.
The standard CtrlClick and ShiftClick selection
methods are available. Press the OK button when
the failure modes you want are all selected.
The data, including the PM Tasks are copied to
the selected failure modes.
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Generating RCM Reports
The Assy Type field in ASENT gives you control
over which assemblies are included in your RCM
report. Assemblies with a blank assembly type are
automatically excluded from the report.
Selecting RCM Reports from the reports drop down
menu of the Assembly menu displays the RCM
Reports option panel.
Select an Assembly type from the bottom window
and check the reports you want. You can run this
report for a single assembly or an entire subtree
by clicking the Include SubAssemblies check
box. The Excel workbook, with a page for each
selected report, is generated.