On the idea of Cessna checking several high-time Skymasters for wing-attach problems, there's no need. Don Nieser's Commodore Aerospace has done it as part of their restorations and found none.
On Dave's idea of tracking the fairly new aircraft with the single wing-attach SDR, it's serial number 01633. The facility may not be in Europe. For those of you eager to look at the Skymaster SDRS, you may find them at
www.consultresearch.com/337SDRSC7.html arranged by area of the aircraft (the single wing-attach SDR is the fifth in the Wing section).
Keep in mind that thse SDRS may be the result of hard landings or manufacturing defects. You need to analyze the data carefully, then go to the Form 337 database to see if there were prior accidents, but some are not reported. In this case, the newness of the aircraft (a 337G inspected in 1976 with 570 hours) says it all.
One final thought as to why this SID exists, and please allow me some editorial license: since the 400-series aircraft had problems in the wing attach areas (including an in-flight wing separation) and since separation of a wing is the aircraft structural engineer’s worst nightmare, Cessna chose to include a wing-attach SID for Skymasters. The inclusion ignores the vast differences in loading between the low-wing 400-series and the high-wing Skymaster, the massive over-design of the Skymaster wing-attach area, and the absence of any fatigue problems in many disassembled high-time aircraft.
So it seems sort of knee-jerk reaction. There are compelling reasons for excluding it -- it is unnecessary, its cost threatens to ground many aircraft, and it actually
increases the risk of Skymaster accidents -- but to date Cessna won't budge.
Ernie Martin