I have a 1973 P model that was used as a fire fighter, after speaking with three different IA's all agree that Note 1 of the AD applies only to non-pressurized 337s. One says there is no reason to do the inspection until the airframe has 10,000 hours, the other two believe the best course would be to voluntarily begin the inspections at the 5000 hour mark to be on the safe side. It is my understanding that the P has a stronger airframe, and the latter recommendation seems safe and reasonable. I just wanted to get some of your thoughts. Borden
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M2B15