What does "Class" mean in an FMEA?

[ISO_Man]

what does "Class" mean in FMEA?

 

[Miner]

This is where you can identify Critical/Significant characteristics.

 

[AndyN]

There's a strange parallel universe going on here and at QFO...

 

[Miner]

I saw that post, but you already had it covered.

 

[ISO_Man]

This is where you can identify Critical/Significant characteristics.

Anyone have a little more than that? Even the FMEA examples online seem to skip that column - I'm not sure to do with it.

 

[Miner]

I found the following description.

For Automotive applications the following applies:

Critical Characteristic is a product feature, dimension or note that reasonably anticipated variation could directly affect compliance with government regulations or safe operation of the equipment. Any of those characteristics that affect a failure mode with a severity of 9 or 10 must be reviewed to determine if they should become a critical characteristic.

Significant Characteristic is a feature, dimension, or note that reasonably anticipated variation could affect principal fit, function, durability, customer satisfaction, or manufacturability. Any of those characteristics that affect a failure mode with a severity of 5 to 8 and an occurrence of 4 or higher must be reviewed to determine if they should become a significant characteristic

 

[Jimmy123]

I found the following description.

For Automotive applications the following applies:

Critical Characteristic is a product feature, dimension or note that reasonably anticipated variation could directly affect compliance with government regulations or safe operation of the equipment. Any of those characteristics that affect a failure mode with a severity of 9 or 10 must
be reviewed to determine if they should become a critical characteristic.

Significant Characteristic is a feature, dimension, or note that reasonably anticipated variation could affect principal fit, function, durability, customer satisfaction, or manufacturability. Any of those characteristics that affect a failure mode with a severity of 5 to 8 and an occurrence of 4 or higher must be reviewed to determine if they should become a significant characteristic

How does this improve the quality?

 

[Miner]

These are characteristics that require special action to mitigate the risk. That action might be a design change to reduce the severity, preventive controls to reduce occurrence, or detection controls.

 

[Marc]

Also see:

Criteria for defining FMEA & Control Plan Critical and Significant Characteristics

DFMEA & PFMEA - Special Characteristics Identification

FMEA - Failure Modes and Effects Analysis

Characteristics I

 

[AndyN]

Anyone have a little more than that? Even the FMEA examples online seem to skip that column - I'm not sure to do with it.

The AIAG book doesn't... I'd recommend buying it.