If it flys in anything it is based on hours run when compared with the manufacturers limitations and suggestions ie Ground run, Test run, air travel or hover (up or down) or forward or reverse or sideways flight, that way you can judge pretty safely if you will survive the next start...... all that really is part of your knowledge gained in getting your Pilots ticket............ However
If its attached to a combined Harvester, Garden equipment pumps or grass cutting thingys its just when it stops working, thats when you need another bit,... or full engine, quiet simply you walk away ring someone up and order another donkee. the difference between the former and the latter is that with the former sometimes it could be difficult to walk away to use the telephone
Simple really
Vfrpilotpb
