Essay on Root Cause Analysis

2271 Words Sep 14th, 2011 10 Pages
Root Cause Analysis

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Root Cause Analysis
• Root Cause Analysis is a method that is used to address a problem or non-conformance, in order to get to the “root cause” of the problem. It is used so we can correct or eliminate the cause, and prevent the problem from recurring. • Traditional applications of Root Cause Analysis
– Resolution of customer complaints and returns. – Disposition of non-conforming material (Scrap and Repair) via the Material Review process. – Corrective action plans resulting from internal and customer audits.

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Objective
• Through this training course, you will:
– Understand the meaning of “Root Cause” – Know the steps used to identify the root cause of problems.

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What is Root Cause?
• Root
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Machine Machine Doesn’t Doesn’t Work Work
Fuse Missing? Fuse Blown?

Fuse Blown

Y? H Y? WH W Determine

Determine the Cause. the Cause.
12

Investigate Why
Motor Overheated? Electrical Overload?

Fuse Fuse Blown Blown
Lightning Storm? Power Surge?

Motor Overheated

Corrective Action for Corrective Action for Specific Deficiency: Specific Deficiency:
Replace the Fuse Replace the Fuse

Y? H Y? WH W Determine

Determine the Cause. the Cause.
13

Investigate Why
Cooling Fan? Fly-Wheel Loose?

Motor Motor Overheated Overheated
Shaft Damaged? Motor Mis-Installed?

Shaft Damaged

Y? H Y? WH W Determine

Determine the Cause. the Cause.
14

Investigate Why
Wrong Belt? Bearing Destroyed?

Mis-Handled? Mis-Installed? Incorrect Tolerance/Fit?

Shaft Shaft Damaged Damaged

Bearing Destroyed

Y? H Y? WH W Determine

Determine the Cause. the Cause.
15

Investigate Why
Bearing Loads? Bad Bearings?

Bearing Bearing Destroyed Destroyed
Wrong Bearings? Seal Omitted?

Cause of Failure: Seal Omitted

Corrective Action for Corrective Action for Specific Deficiency: Specific Deficiency:
Replace the Motor Replace the Motor

Loss of Lube

Y? H Y? WH W Was Seal

Was Seal Omitted?? Omitted??
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Root Cause of our Example?
Parts Shortage Inadequate Work Instructions?

Fell Out? Operator Error? Missed Operation?

Seal Seal Omitted Omitted

Root Cause -Root Cause
Inadequate Inadequate Work Instructions

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