Q) Why is it that the United States is the only country in the world where a mechanic can work on a private aircraft on his/her own WITHOUT an approved maintenance organisation ?
4 Holer, perhaps you should familiarise yourself with the following CASA publication... Schedule 8 of CAR 1988.
http://www.casa.gov.au/wcmswr/_asset...rth/42zc_1.pdf
Here are a few gems from this document detailing what a PILOT can do.
Replacement of side windows in an unpressurised aircraft
Replacement of seat belts or harnesses.
Replacement of bulbs, reflectors, glasses, lenses or lights.
Replacement, cleaning, or setting gaps of spark plugs.
Replacement of batteries.
Changing oil filters or air filters.
Changing or replenishing engine oil or fuel.