peasacake
I have seen many results of bad (and / or not recorded) owner maintenance, its sends shivers down my spine even thinking of it. How many times have I experienced a "trained" pilot drain a hot piston engine of oil, then forget to refill (due to being distracted) before starting the engine up............oops[/QUOTE]
And I’ve seen many results of professional maintainers committing similar sins:-
Running a 300CBi without oil and writing off the engine
Not tightening the tail rotor drive shaft spline pin on E480
All fastenings loose on top of an E480 rotor head
Countless tools left in engine bays/transmission decks
Loose bolts on combustion chamber of Ariel after Turbomeca overhaul
Bolt anti-locked on brand new AS350
Chafing oil pipe on same brand new AS350
Lack of split pin on AS350 hydraulic servo retention bolt.
plus multiple more that don’t immediately spring to mind
Apart from the 300CBi at the top of the list, these were all my own finds in aircraft released for flight/ground run. Going to a ‘pro’ maintenance organization, or even OEM doesn’t guarantee anything.