There are many ways to do a pre-purchase inspection on used aircraft, and whether the method you choose is right depends on the outcome.
Before committing to a huge annual inspection it is advisable to check the known problem areas on the particular aircraft. This begins with the review of the aircraft technical documents and maintenance records. As a second step the documented problem areas, as well as the known critical areas on the aircraft type need to be inspected on the aircraft. Only if many problems are revealed it might be necessary to perform a more detailed inspection.
groWING can support and perform the entire pre-purchase inspection for you. You will get a detailed report as described in the fleet management section under annual review.