Avionics bill of materials 2

[davedr]

Do avionics companies put process oriented items on their assembly bills of material. For example, if an assembly (surface mount pcb) is built out of house, brought in and through hole parts are added, for different mod's, is the solder on the bill of material? That is, is the drawing engineering data, or does it include process information?

 

[der8110]

It is put in as an average length required per assembly, so ordering quantities can be determined based on production rates. Also alloy is specified. Process specs then tie together the soldering iron, temperature, and tip, and technique for components (discrete, DIP, etc.).

 

[GBor]

We don't work on pcb's, but similarly, we do put manufacturing process related information on detail part drawings, assembly process information on assembly drawings, and installation process information on installation drawings. This is considered part of the engineering data.

If a part has been analyzed with material properties for a certain grain direction, it is important to dictate that grain direction on the part during manufacture. Similarly, if you call for touch-up on alodyne and prime after someone has installed a fastener to bolt something in place, it is placed on the installation drawing.

Things like alodyne and primer are generally listed as "AR" for "as required" or "AS" for "airline supplied". The mod centers generally have this, so we don't supply these items in a kit unless there is a need to do so (mod not being performed at a true mod center).