Spinwing is broadly correct. It would be a VERY good idea to have a trained and experienced engineer (mechanic) as part of your operation. The A109's biggest disadvantage is that it looks like a grown-up JetRanger, so it is assumed you can give it to a pilot on his own and tell him to pucsh off for 100hrs flying ( and just check-in somewhwere for a s'plate grease at 50hrs). That doesn't work
Like most things Italian, it is wonderful when it is going right,
but it will need TLC on a daily basis to ensure it continues to do so; and to pick up small sniggles before they become big (and expensive) ones. Hence the need for an engineer to be around.
Weight on teh C model especially is a problem; no weight engineer in attendance when it was developed from the Mkll.
This just for info and gained from (too) many years of experience ~ VFR