An airworthiness directive (AD) issued May 21 requires one-time inspections of the lower main spar caps on the wings of Cessna 210, P210, and T210 airplanes. According to a report at AOPA.org, the AD calls for either replacement of cracked parts or a to-be-determined FAA-approved modification if cracks are found, as well as reporting of inspection results to the FAA. The AD takes effect June 5 and is expected to affect 3,665 airplanes in the U.S.