jxk
Normally, mags fail shortly after a 500hr inspection has been carried out....
If done by a cowboy, sure.....
You would be surprised how far the AAIB can go in establishing the provenance of parts even they are not related to the cause of an accident
Is the above real or hearsay? I think it is more hearsay because if many AAIB reports were anything to go by, many maintenance shops in the UK would have been shut down yet clearly this has not happened. Almost none (none?) have ever been shut down by the CAA, and the UK prop shop I mentioned got busted by the FAA, IIRC.
The reason why SBs are not generally mandatory is because when a manufacturer applies for a Type Certificate, he surrenders control of maintenance control to the certifying authority.
This is how e.g. the Lyco 12 year engine life is circumvented. The CAA and the FAA allow on-condition operation to say 2000hrs on public ops, and beyond 2000hrs on private ops. So Lycoming could stick a 12
month life on the engine but they would not be able to enforce it because they don't control it.