MEAN TIME BETWEEN FAILURES (MTBF) CALCULATION & REVIEW CHECKLIST

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--- DATA GATHERING & PREPARATION ---
[ ] Number of Units in Production
[ ] Operational Hours per Unit (per year)
[ ] Data Collection Period (e.g., Months, Years) (1 Month, 3 Months, 6 Months, 1 Year, 2 Years)
[ ] Description of Manufacturing Process (brief overview)
[ ] Equipment Bill of Materials (BOM)
[ ] Data Source(s) for Failure Data (CMMS (Computerized Maintenance Management System), Maintenance Logs, Quality Control Records, Operator Reports)
[ ] Start Date of Data Collection
[ ] End Date of Data Collection

--- FAILURE DATA COLLECTION & ANALYSIS ---
[ ] Date of Failure Event
[ ] Time of Failure Event
[ ] Operating Hours at Time of Failure
[ ] Detailed Description of Failure Event
[ ] Failure Mode Category (e.g., Mechanical, Electrical, Software) (Mechanical, Electrical, Software, Hydraulic, Pneumatic, Other)
[ ] Affected Components (Select all that apply) (Motor, Sensor, Controller, Actuator, Power Supply, Mechanical Linkage, Other)
[ ] Root Cause Analysis Summary
[ ] Supporting Documentation (e.g., Photos, Logs)
[ ] Severity of Failure (Impact on Production) (Minor (Minimal Impact), Moderate (Temporary Downtime), Major (Significant Downtime), Critical (Production Stop))

--- MTBF CALCULATION METHODOLOGY ---
[ ] Chosen MTBF Calculation Method (Basic Arithmetic Mean, Minimum MTBF, Exponential Smoothing, Weibull Analysis, Other (Specify))
[ ] Justification for Chosen Method
[ ] Number of Failures Used in Calculation
[ ] Total Operating Time (Hours)
[ ] Mean Failure Rate (Î») - if calculated
[ ] Description of any Assumptions Made
[ ] Spreadsheet or Software Used for Calculation (Optional)
[ ] Failure Data Correction Factors Applied? (Yes, No)

--- MTBF CALCULATION & VALIDATION ---
[ ] Total Operating Hours (Data Period)
[ ] Number of Failures (Data Period)
[ ] MTBF (Calculated)
[ ] Calculation Method Used (e.g., Basic, Exponential, Miner's)
[ ] Formula Used (Detailed)
[ ] Units of Time for MTBF (e.g., Hours, Days, Years) (Hours, Days, Weeks, Months, Years)
[ ] Supporting Calculation Files (Spreadsheets, Documents)
[ ] Confidence Interval (Calculated)
[ ] Data Validity Review (Pass/Fail) (Pass, Fail)

--- REVIEW & DOCUMENTATION ---
[ ] Calculated MTBF Value (Hours)
[ ] Summary of Assumptions & Limitations in Calculation
[ ] MTBF Calculation Method Used (Basic MTBF Calculation, Weibull Analysis, Other (Specify in LONG_TEXT))
[ ] Date of MTBF Calculation
[ ] Reviewer Comments & Observations
[ ] Overall MTBF Result Assessment (Acceptable, Marginal - Further Investigation Needed, Unacceptable - Requires Immediate Action)
[ ] Supporting Documentation (e.g., Failure Logs, Data Spreadsheets)
[ ] Reviewer Signature

--- IMPROVEMENT & CORRECTIVE ACTIONS ---
[ ] Summarize Root Causes of Failures Affecting MTBF
[ ] Potential Corrective Actions (Select all that apply) (Design Modification, Process Improvement, Material Change, Operator Training, Preventative Maintenance Schedule Adjustment, Component Redesign, Supplier Collaboration)
[ ] Estimated Cost of Corrective Action (in USD)
[ ] Target Completion Date for Corrective Action
[ ] Detailed Description of Planned Corrective Action
[ ] Risk Level of Proposed Corrective Action (High/Medium/Low) (High, Medium, Low)
[ ] Supporting Documentation (e.g., Engineering Change Orders, Test Reports)
[ ] Expected Improvement in MTBF (Estimate)

--- CALIBRATION AND VERIFICATION OF DATA SOURCES ---
[ ] Data Source Integrity Check Performed? (Yes, No, Not Applicable)
[ ] Last Calibration/Verification Date of Data Logging System
[ ] Calibration Frequency (e.g., months between calibrations)
[ ] Describe Calibration Procedure Used
[ ] Upload Calibration/Verification Documentation (e.g., reports)
[ ] Data Source Validation Method Employed? (Comparison with Historical Data, Cross-Referencing with Other Systems, Manual Verification by Trained Personnel, Statistical Process Control (SPC) Charts, Other)
[ ] Detailed notes/observations during data source verification (e.g., anomalies, discrepancies)

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