Thanks for that 212man
that clarifies it, they must be FAR29 compliant (or its equivalent)
Tourist you missed the point entirely, the design standards for passenger carrying aircraft and components ARE different to non-pax carrying aircraft so the blade does care. Pax carrying rules (ie FAR29 etc) are very rigorous regarding structural strength, damage tolerance and fatigue life calculation, logging etc has a completely different usage spectrum and flight envelope to pax carrying flights and that is why the rules are different.
read them before making silly comments like that
DM