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MADE Training > Session 4 > 4.2 Reliability Allocation

Session 4.2: Reliability Allocation

Session 4.2 Outline

  • 4.2.1: Types of Allocations in MADE
  • 4.2.2: Create an Equal Reliability Allocation Analysis
  • 4.2.3: Create a Weighted Reliability Allocation Analysis
  • 4.2.4: Generate a Reliability Allocation Report
  • 4.2.5: Mean Time Between Unplanned Maintenance
  • 4.2.6: Mean Time Between Critical Failure
  • 4.2.7: Mean Time Between Failure

Discussion 4.2.1: Types of Allocation in MADE

There are four Reliability Allocations available in MADE:

  1. Reliability Allocation
  2. Mean Time Between Unplanned Maintenance (MTBUM)
  3. Mean Time Between Critical Failure (MTBCF)
  4. Mean Time Between Failure (MTBF)

There are three approaches for Reliability Allocation in MADE:

  1. Equal Target Allocation — Based on Advisory Group on the Reliability of Electronic Equipment (AGREE) method; uses an evenly distributed reliability approach for all items
  2. Weighted Target Allocation (AGREE) — State of the Art, Hardware Complexity, Functional Complexity
  3. Weighted Target Allocation (ARINC) — Historical Reliability Data

There are two approaches for MTBUM, MTBCF and MTBF in MADE:

  1. Equal Target Allocation (AGREE method)
  2. Weighted Target Allocation (ARINC) — Historical Reliability Data

Exercise 4.2.2: Create an Equal Reliability Allocation Analysis

Create a new reliability allocation analysis:

  1. From the menu bar, select Analyses > Reliability Allocation Editor
  2. Select the icon to create a new Reliability Allocation
  3. Select the Reliability Allocation tab at the top of the dialog
  4. Select the target-item picker to set Power Generation as the Target Item
  5. Set the Analysis Type to: Equal
  6. Fill in the RA Analysis Name: Design Targets
  7. Fill in the RA Analysis Description: Reliability targets for Power Generation system.
  8. Select the New group (Mission Group) from the drop down list
  9. Select Create to create the new RA analysis

From the Analysis Configuration page:

  • Set the Reliability Target as 0.90
  • Verify Target item is the Power Generation subsystem
  • Select Calculate to calculate the reliability
  • Verify that the Analysis Result page will be displayed once the calculations are complete

Apply Reliability Allocation analysis results:

  • Evaluate all the results shown in the analysis results table
  • Select the select-all checkbox to select all items in the table
  • Select Apply to open the Confirm Allocation dialog
  • Review the changes in MTTF for each item then select Confirm to apply the new MTTF values

Verify Reliability Allocation analysis results:

  • Open the Diesel Engine System Model and select the Coupling 1 component
  • From the Properties viewer select the Exponential tab
  • Verify that the allocated Part Failure Rate matches up with the allocated value below

Discussion 4.2.3: Create a Weighted Reliability Allocation Analysis

Weighted RA is based on the following methods of weighting:

  • State of the Art — A more highly developed item is given a higher ranking than a less developed item; items with higher State of the Art are assigned relatively lower reliabilities than other items on the same level of indenture
  • Hardware Complexity — A more complex item is given a higher ranking than a less complex item; items with higher Hardware Complexity are assigned relatively lower reliabilities on the same level of indenture
  • Functional Complexity — A more complex item is given a higher ranking than a less complex item; items with higher Functional Complexity are assigned relatively lower reliabilities on the same level of indenture
  • Historical Reliability Data — Weighting is automatically calculated based on the relative current reliability values in the system model

Exercise 4.2.3: Create a Weighted Reliability Allocation Analysis

  1. From the menu bar, select Analyses > Reliability Allocation Editor
  2. Select the icon to create a new Reliability Allocation
  3. Select the target-item picker to select Diesel Engine as the Target Item
  4. Set Analysis Type to Weighted (AGREE)
  5. Set Weighting Type to Functional Complexity
  6. Fill in the RA Analysis Details: Name: Design Target 2; Description: Reliability targets for filters.
  7. Select the New group (Mission Group) from the drop down list
  8. Select Create to create the new RA analysis

From the Analysis Configuration page:

  • Set the Reliability Target to Custom and enter 0.85
  • Select the Primary Fuel Filter & Secondary Fuel Filter components in the Weighted Analysis Inputs table
  • Set Functional Complexity Item Weighting for both components to 8.0 from the slider
  • Lock the Reliability of the Air Filter component using the lock icon (locking the reliability of the Air Filter forces the reliability to not change when the allocation analysis is conducted)
  • Run the analysis
  • Verify that the Analysis Result page will be displayed once the calculations are complete

Apply Reliability Allocation analysis results:

  • Select the Primary Fuel Filter & Secondary Fuel Filter check boxes in the table
  • Select Apply to open the Confirm Allocation dialog
  • Review the changes in MTTF for each item then select Confirm to apply the new MTTF values

Verify Reliability Allocation analysis results:

  • Open the Diesel Engine System Model and select the Primary Fuel Filter
  • From the Properties viewer select the Exponential tab
  • Verify that the allocated Part Failure Rate matches up with the allocated value

Discussion 4.2.4: Generate a Reliability Allocation Report

This report summarizes each RA analysis. The RA Report is divided into 3 sections:

  • Cover Page
  • Glossary of Terms
  • Reliability Allocation Analysis — includes Duration of Operation, Item Reliability, Failure Rate, MTTF, Weighting

Exercise 4.2.4: Generate a Reliability Allocation Report

  1. Select Reports > Report Wizard from the main menu
  2. Select Reliability Allocation Report then Next
  3. Select the Design Targets analysis
  4. Select Generate

Discussion 4.2.5: Mean Time Between Unscheduled Maintenance (MTBUM)

Mean Time Between Unscheduled Maintenance is a reliability allocation method aimed to address maintainability of components based on:

  • Target Item — Item to indicate level of indenture for the analysis
  • Allocation Type — Equal or Weighted (ARINC)
  • MTBUM Requirement — the maximum acceptable time for maintenance for the selected target item
  • Design Margin — allowance on maintainability of item
  • MTBF of component* — the failure rate of the component
  • MTBUM Prediction of component* — the maintainability prediction of the component

(*Applicable to MTBUM Weighted (ARINC) analysis only)

Exercise 4.2.5: Create a Weighted MTBUM Analysis

  1. From the menu bar, select Analyses > Reliability Allocation Editor
  2. Select the icon to create a new Reliability Allocation
  3. Select the MTBUM tab at the top of the dialog
  4. Select the target-item picker to select Diesel Engine as the Target Item
  5. Set Analysis Type to Weighted (ARINC)
  6. Fill in the details: Name: MTBUM Analysis; Description: Demonstration MTBUM Analysis for MADE Training.
  7. Select Create to create the MTBUM Analysis

From the Analysis Configuration page:

  • Set the MTBUM Requirement as 50000 hrs
  • Set the Design Margin to 10%
  • Verify Target item is the Diesel Engine subsystem
  • Select Engine from the table and edit: MTBF: 50000 hrs; MTBUM Prediction: 30000 hrs

Enter the following values for the components:

Model Item MTBF (hrs) MTBUM Prediction (hrs)
Air Filter 15000 15000
Coupling 1 8620.69 8620.69
Engine 50000 30000
Governor 35000 40000
Injector Pump 30000 25000
Lift Pump 40000 35000
Primary Fuel Filter 10000 10000
Secondary Fuel Filter 15000 15000

The MTBUM analysis can be exported to create a requirement in the Requirements Verification Tool section. To create the requirement, select the export button — a requirement will be populated in the Requirements Verification Tool.

Then:

  • Select the Reliability Allocation tab
  • Select Calculate to calculate the reliability
  • Verify that the Analysis Result page will be displayed once the calculations are complete
  • From here, similar to Reliability Allocation, the results for selected model items can be applied to the System Model or an MCE analysis by selecting the respective buttons
  • Do NOT apply to system model (per training exercise instructions)

Discussion 4.2.6: Mean Time Between Critical Failure (MTBCF)

MTBCF is a reliability allocation method aimed to address maintainability of components based on:

  • Target Item, Allocation Type (Equal or Weighted ARINC)
  • MTBCF Requirement — the maximum acceptable time for maintenance for the selected target item
  • Design Margin — allowance on criticality of item
  • MTBF of component
  • Mission Critical status — assignment of mission critical status for the component
  • Criticality Factor of component* — percentage value assigned to the component (*Applicable to MTBCF Weighted (ARINC) analysis only)

Exercise 4.2.6: Create a Weighted MTBCF Analysis

  1. Analyses > Reliability Allocation Editor > create new
  2. Select the MTBCF tab
  3. Select Diesel Engine as the Target Item
  4. Set Analysis Type to Weighted (ARINC)
  5. Name: MTBCF Analysis; Description: Demonstration MTBCF Analysis for MADE Training.
  6. Create the MTBCF Analysis

From the Analysis Configuration page:

  • Set the MTBCF Requirement as 70000 hrs
  • Set the Design Margin to 10%
  • Verify Target item is the Diesel Engine subsystem
  • Select Engine from the table and edit: MTBF: 50000 hrs; Mission Critical: Yes; Criticality Factor (%): 60%

Enter values for the components:

Model Item MTBF (hrs) Mission Critical? Criticality Factor (%)
Air Filter 15000 No 10%
Coupling 1 8620.69 Yes 80%
Engine 50000 Yes 60%
Governor 35000 Yes 100%
Injector Pump 30000 Yes 80%
Lift Pump 40000 Yes 75%
Primary Fuel Filter 10000 Yes 55%
Secondary Fuel Filter 15000 No 35%

Select Calculate to calculate the reliability; verify the Analysis Result page is displayed. Results for selected model items can be applied to the System Model or an MCE analysis by selecting the respective buttons.

Discussion 4.2.7: Mean Time Between Failure (MTBF)

MTBF is a reliability allocation method aimed to address maintainability of components based on:

  • Target Item, Allocation Type (Equal or Weighted ARINC)
  • MTBF Requirement — the maximum acceptable time for maintenance for the selected target item
  • Design Margin — allowance on failure rate of item
  • MTBF prediction of component* (*Applicable to MTBF Weighted (ARINC) analysis only)

Exercise 4.2.7: Create a Weighted MTBF Analysis

  1. Analyses > Reliability Allocation Editor > create new
  2. Select the MTBF tab
  3. Select Diesel Engine as the Target Item
  4. Set Analysis Type to Weighted (ARINC)
  5. Name: MTBF Analysis; Description: Demonstration MTBF Analysis for MADE Training.
  6. Create the MTBF Analysis

From the Analysis Configuration page:

  • Set the MTBF Requirement as 50000 hrs
  • Set the Design Margin to 10%
  • Verify Target item is the Diesel Engine subsystem
  • Select Engine from the table and edit: MTBF Prediction: 30000 hrs

Enter values for the components:

Model Item MTBF Prediction (hrs)
Air Filter 25000
Coupling 8620.69
Engine 30000
Governor 30000
Injector Pump 25000
Lift Pump 35000
Primary Fuel Filter 10000
Secondary Fuel Filter 15000

Select the Reliability Allocation tab, select Calculate. Results for selected model items can be applied to the System Model or an MCE analysis by selecting the respective buttons.

Session 4.2 Summary

  • 4.2.1: Types of Reliability Allocation in MADE
  • 4.2.2: Create an Equal Reliability Allocation
  • 4.2.3: Create a Weighted Reliability Allocation
  • 4.2.4: Generate a Reliability Allocation Report
  • 4.2.5: Mean Time Between Unplanned Maintenance
  • 4.2.6: Mean Time Between Critical Failure
  • 4.2.7: Mean Time Between Failure

Source: Local MADE 3.9.1 installation: com.phm.made.help.plugin/documents/help/pdf/MADE Training Session 4.pdf · retrieved 2026-07-09