Hi Bob
As a former and current contract manufacturer of this sort of thing, I have to steal Doug's "it depends" (tm).

When repairs are needed the allowability and acceptability is entirely customer dependent.  I have dealt with some customers who give a blanket OK to do IPC 7721 repairs, some who will OK a subset of them, some want reporting of usage of the repair methods, and some will not allow any repair work.  Interestingly enough this does not correlate to mission criticality, or end use environment, it seems to be based on gut reaction - whatever experience the customer engineering team has had.

The only boundary condition I've worked with (other than "no, you can not repair") has been track repair - none of the customers I have worked with have allowed a foil repair.  In every case an actual wire has been used (e.g. pad torn off, we can bond down a replacement pad but have to connect that pad to the circuitry using a jumper wire).

regards,

Graham Collins
Senior Process Engineer
Sunsel Systems
(902) 444-7867

On 10/13/2015 7:58 PM, Bob Wettermann wrote:

Technetters:

I was visiting with a class III assembler today (MIL/Aero) who was asking
me about other MIL/AERO customers who allow or do not allow for boards to
be repaired (IPC 7721 procedures to affect repairs).

As an informal "census" do you Class III assemblers and OEMs ...

A. Allow repairs as a matter of course (or is it a "depends" answer)

B. Allow for pad repairs (If YES under which boundary conditions?)

C. Allow for corner or other laminate repairs (If YES under which boundary
conditions?)

D. Allow for mask repairs (If YES under which boundary conditions?)

Thanks for comments in advance!

Bob/BEST



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