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Landing Gear Structure
Centered Power,
My two cents worth - looking at my IPC (1965 thru 1969 Skymaster) you will clearly see there are differences in the structural components on the main landing gear bulkhead assembly (additional doublers after S/N 0526 for the higher gross weights, and even some different bulkhead channel part numbers after S/N 0610). Perhaps there are some more structural differences from after 1969 to 1971 that raised this gear speed number. To the normal eye (and even some trained mechanics) the structure looks identical, but Cessna, like all OEMs, made small changes to structure with small doublers or thicker webs and channels that strengthen up the structure. You would need to study the IPC between those model years. Sometimes you find some weird changes in the models based on marketing, however you have to be cautious when it comes to some things associated with limitations like speeds and weights - as there were subtle differences in the engineering to justify these changes such as small structural differences or flight control rigging differences to compensate for the different limitations.
Regards,
Jeff
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