There are at least three aircraft that we are aware of so far where the cracking described in the SB have been found. I first want to be very clear that we do not believe this potential issue is specific to an individual model, even though the models I am about to describe are all RV-7s. But, since you asked: Two of the aircraft we are aware of at this time are RV-7s that have been operated for around 2,000 hours each. The photos you see in the service bulletins are from those aircraft. The RV-7 that Mike Seager flies (477RV) for factory transition training has been inspected and does not have cracks. That airplane has more than 6,000 hours. Our RV-7A demonstrator aircraft was inspected and did have the cracks. That airplane has about 2,650 hours of accumulated time. Based on what we have seen so far, using time in service or making assumptions about how it was operated (which really is all subjectively relative) should not be used to determine whether or not this bulletin is more or less important. Inspect and verify, and of course fix when needed, is our firm direction.