Trying to grasp the AD for wing spars

[Ernie Martin]

I agree with Herb, and some of the SIDs make sense and should be used as guides, but if we focus on the big-ticket item -- the wing-attach points SID -- there are two additional factors to consider:

1. There is NO indication that there has ever been a problem in the area. If you read the entire SID thread you will learn that Cessna's stated methodology for areas needing SID attention was the FAA Service Difficulty Reports (SDRs, over 35 years of problem reports furnished to the FAA by repair shops, with about 1,000,000 reports, of which 1,773 involve Cessna 337 aircraft), BUT there were no relevant SDRs in this area. More importantly, Don Nieser's Commodore Aerospace has disassembled numerous Skymasters -- some with well over 5,000 hours -- and has never found corrosion or stress in this area.

2. If not done properly -- and that's likely with an inexperienced shop -- the SID may cause more harm than good, putting undue stress in the inspection area.

Ernie