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#2
07-28-13, 07:10 PM
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AD's are mandatory. SID's are not mandatory. I think you may be confusing the two.
The wing spar AD is mandatory at 5,000 hours airframe time (3,000 for utility use). I have heard costs in the $2K to $3K range for the wing spar AD compliance at 5,000 hours
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Herb R Harney 1968 337C Flying the same Skymaster for 47 years 
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