[s3r3nity]

This was my initial reaction as well, but in these work environments record keeping is USUALLY extensive by design: parts, tools, even minor acts like tightening a screw or bolt is logged.

The fact that they can't reproduce _ANY_ records of this work, including who would've done the work, is suspicious.

Any HN'ers here have experience in these types of environments to either validate / refute?

[jononor]

I do not know aerospace. But even in electronics manufacturing for general industrial use one has protocols for documenting repairs (be it Return To Manufacturer or site work), and missing would be considered a deviation. I don't think one could be compliant with a under a standard quality manager system like ISO9000 either. I would consider the lack of traceability a serious failure in itself.