Originally Posted by
RR_NDB
We assembled a big System (SPC Telephone switching System) prototype using "wire wrap". Big dense boards presenting complex testability issues.
I am amazed they were used also in avionics. (you lost precious volume due pins lenght).
From my own experience, I think you'll find that in avionics "wire-wrap" was only used for the "mother-board" wiring, and not for the circuit boards themselves, so "volume loss" was not really an issue.
BTW, I think the whole "wiring" issue is a red herring.... I was hoping somebody with enough knowledge of the ACARS system would come forward with an exact definition of the "WRG" message label, but so far that hasn't happened (or did I miss that?)..
I would have expected faults such as a faulty SSM, or NCD, or parity errors, to have been flagged "BUS" rather than "WRG".