GtE
Perhaps I should have said inspecting rather than fitting but the principle stands, in these day when accidents never happen because the lawers are driving society to always think that someone is to blame an inspector has to be very careful.
A few years back an recreational aircraft inspector was involved implicated in events that resulted in a fatal accident, the law did not difereciate between the duty of care that the recreational inspector and a professional inspector must give. The results for the inspector were tragic as the full weight of the law and prison loomed, and this all because he was acting with the best of intentions and made a mistake.
In my view this puts the inspector in a very dangerous position, if something goes wrong he can loose his home, his savings and his liberty if he fails to take reasonable steps to assure the quality of the work he is certifying..........and all this for travel expences !
The bottom line is that there has to be some sort of quality control on safety critical parts, and this sort of audit trail costs money and if you want to fly you have to understand you must pay for this quality control.