Definition Repair - Definition

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#1
Repair - Defined as action that makes the object usable but not to drawing specifications. Requires customer approval.

Elsmar Cove Wiki: Repair
 
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Wes Bucey

Quite Involved in Discussions
#2
I've always been under the impression "repair" brought product back within specifications.

For examples:
small machined parts may have had flaws in the plating process. Often, second party platers will unilaterally determine the flaw exists, strip the plating, and replate before the parts ever leave their premises. Once the parts leave their premises and arrive at a customer, they may be rejected and returned for "repair" which means stripping and replating. This is a relatively common occurrence because some intricate parts may have retained some contaminants during the cleaning process which subsequently interfere with the plating process. Repaired or replated parts are in spec as if the repair had never been done.

If a manufacturer makes a machine and one of the bolts or other fasteners works loose during transit, it can be "repaired" by replacing the fastener with a new one before or after delivery to a customer and such replacement brings the product back into "spec."

In terms of customer approval: normally, approvals are a matter of contract and specific to certain types of products or to government regulation - hence, some products are labeled "remanufactured" rather than marketed as new, first quality, regardless if they had EVER been used prior to the repair and are indistinguishable from new, first quality by normal inspection methods.
 

Ron Rompen

Trusted Information Resource
#3
I have to agree with Wes on this one. The entire intent of doing 'repair' is to yield a product which meets specification.

(Note that this MAY be renegotiated with the customer to 'meets functional requirement')
 

Jim Wynne

Staff member
Admin
#4
Ron Rompen said:
I have to agree with Wes on this one. The entire intent of doing 'repair' is to yield a product which meets specification.

(Note that this MAY be renegotiated with the customer to 'meets functional requirement')
The problem here is that there is no universally accepted definition for "repair" and the definition for "rework" might include bringing nonconforming material into conformance, or into nonconforming usability. Furthermore, just because the customer agrees to accept material that doesn't meet specifications doesn't mean that the specifications are wrong; concessions are sometimes made under duress. Maybe we should shy away from posting definitions for terms that don't have generally accepted meanings, or include a disclaimer warning the reader to check with the customer for the "correct" definition.
 

Al Rosen

Staff member
Super Moderator
#5
From MIL-STD-1520C, Corrective Action and Disposition System for Nonconforming Material.
3.12 Repair. A procedure which reduces but not completely eliminates a nonconformance and which has been reviewed and concurred in by the MRB and approved for use by the Government. The purpose of repair is to reduce the effect of the nonconformance. Repair is distinguished from “rework in that the characteristic after repair still does not completely conform to the applicable drawings, specifications, or contract requirements. Except for SRPS (see paragraph 3.15 below), Proposed repairs approved by the Government are authorized for use on a one-time basis only.

3.13 Rework. A Procedure applied to a nonconformance that will completely elminate it and result in a characteristic that conforms completely to the drawings, specifications, or contract requirements.
As an example, a broken trace on a printed circuit board that has been jumpered with a wire in the appropriate manner is a repair. The PCB will function but the spec for the board did not include the jumper.
 
B

Bob Ablondi

#6
Al Rosen said:
From MIL-STD-1520C, Corrective Action and Disposition System for Nonconforming Material.

As an example, a broken trace on a printed circuit board that has been jumpered with a wire in the appropriate manner is a repair. The PCB will function but the spec for the board did not include the jumper.
Best answer. This is as defined in 10CFR50 for nuclear plants, Simply put a repair brings
it into compliance to the customers' requirement dut not the original requirement. If we repaired an A36 plate by welding, this would be a repair since the plate does will not meet ASTM A36. If the plate was too long and was brought into customer's print by cutting or machining this would be rework.

Bob Ablondi
 

Wes Bucey

Quite Involved in Discussions
#7
I think the suggestion to "flag" definitions which are not universally agreed is a good one. A better one is to include a caveat which says, "when in doubt, do not hesitate to ask for clarification from the party using the abbreviation or acronym."

The problem in using the definitions from the old MIL STD series is they are all declared "obsolete" by the government that created them. The replacement Standards from SAE, ASME, Steel & Iron Institute, etc. often do not pick up the style of being absolutely, positively, "Prescriptive" about many definitions.

I am minded of the great variety of terms for the various steps in making a formal change (revision) in a document or product, depending on the industry and the company involved. I've seen:
  • ECR = engineering change request, engineering change report, engineering change review, engineering change requirements
  • ECC = engineering change checklist
  • ECP = engineering change proposal, engineering change procedure, engineering change process
  • ECD = engineering change document
  • ECO = engineering change order
  • DCR = design change request, document change requirement, document change review
  • DCP = design change process, design change proposal, design change procedure, document change process, document change procedure, document change proposal
and so on, ad nauseum, and that's only the ones I remember being used in connection with a design change. My own policy regarding USING an acronym or abbreviation is to spell it out at least once in the text. When I encountered one with no text explanation in a customer's documents, part of contract review was to get a WRITTEN definition from the customer which would be added to the file.
 
J

Jim Howe

#8
Al Rosen said:
From MIL-STD-1520C, Corrective Action and Disposition System for Nonconforming Material.

As an example, a broken trace on a printed circuit board that has been jumpered with a wire in the appropriate manner is a repair. The PCB will function but the spec for the board did not include the jumper.
Thanks Al! This is the way I learned it as well. I see no good reason to not use it. It is very clear and precise.
 

Tim Folkerts

Super Moderator
#10
OK, I like the idea that a jumper wire is a repair becase it works but doesn't meet the original specs. But suppose you could somehow fix the board so that is did meet the original specs - what would you call this? :confused:

If you fix a car with original parts so that it is as good as new, is that a repair or not? If you use substandard parts, but the car still works, is that a repair? :confused:

Tim F
 
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