Are you a piper Cherokee owner cursed by AD 70-16-05. You know, the one that calls out recurring visual inspections on the exhaust system every 50 hours! This AD effects Piper Models PA-28-140 SN 28-20001 through 28-26400 and PA-28-150,160,180 SN 28-1 through 28-1760A with PN 63627-00 or 63688-00 muffler installed. Next time your aircraft is in for maintenance or an annual look at the logs. If their is a statement about complying with AD 70-16-05 by visual inspection than you are effected! The AD calls out to inspect the entire exhaust system, remove all heat shrouds, and remove one side of the exhaust system to inspect the muffler interior every 50 hours if your muffler is over 950 hours old. What’s the solution? When your muffler hits 950 replace it with PN: 99482-00 or 99482-02. This will eliminate the recurring inspections of this AD, improve safety, and decrease aircraft down time.