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Re: "...the wing spar AD must be done at air frame total time of 3,000 hrs..."
Actually, the AD verbiage for terrain following ops is, "Cessna recommends and FAA strongly urges inspections at intervals shown to the right of this note." [i.e. the 3000/500 hour provision]
Certainly, prudence would dictate factoring in how the airplane was handled during these kinds of operations (as well as your tolerance for being second-guessed by the FAA if something happened). In my case, I know that over the past 1000 or so hours, ops have been mostly overwater, the airplane hasn't been bounced around excessively or manhandled, and our maneuvering has been smooth. Hence, I was comfortable waiting until nearing 5000 hours before having the AD complied with.
Joe
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