Stikman said "...
Cert IV is required to instruct at any RTO, whether it be flying or street sweeping..."
Almost correct, but there are some exceptions so its worth putting this to bed. See https://www.asqa.gov.au/standards/tr...s-1.13-to-1.16
This acknowledges that a qualification in adult education is an alternative to the Cert lV TAE and specifically cites a "CASR Part 61 Flight or Simulator Instructor" as an example.
Flysafe
PJ88