For example, if your replacement prop is from the same manufacturer, same make and model, it would be a minor change/direct replacement. An entry in the maintenance records listing the propeller manufacturer, model/serial number, diameter and pitch should be sufficient. If you changed to a different prop, different size or pitch, etc., then it would probably be a major change by the definition above. The operating limitations should contain language that directs the owner to re-enter Phase I flight testing after incorporating a major change. You will be directed to contact your local Flight Standards District Office (FSDO) so you can provide information about a flight-testing area, and you may have to update the aircraft’s file at the FAA Aircraft Registration Branch.