airnutz wrote:
GarryW wrote:
Slack wrote:
"....aircraft such as the B-17 face "significant" maintenance challenges with the older engine and hydraulic systems not using original manufactured, but fabricated, parts in order to keep flying.
...that have to meet the spec of the original part using modern metallurgy and machining techniques. Machining has come a long way from the 40's. Tolerances that were at that time almost impossible to meet are commonplace today. The replacement parts being made today either meet or far exceed anything made in the 40's. But hey, lets make it sound like some hillbilly is hacking together some sub-standard parts out in his woodshed instead. ...I know which aviation lawyer I'm NOT calling if I ever need one. Idiot.
THIS..ditto. Not to mention from a maintenance aspect these machines are fawned over by their crews and they have the benefit of decades of hindsight in care practices.
A sad loss of people and a wonderful bird, hopefully cooler heads will prevail...
As for the fuel, yes initially revealed as proper fuel further tests were to be conducted.
And with a machinist back ground, machining modern aircraft parts, yes, with the now time much more modern metallurgy and the instrumentation to check that those materials for proper chemical or metals content, as well as many more years of proven heat treating and stress relieving techniques, the "fabricated" parts now will more than meet or exceed what was in the past. And to that fellow writing that, wasn't someone "fabricating" those original parts back in the 40's? That was a just wow comment, by someone that knows nothing about manufacturing. These newer made parts can be checked (inspected) with accuracy that was not available back in the day, it would have been very difficult to check areas with compound radius surfaces in those days, today there are computerized machines to do that, and most average shops have them. I do now see more of a problem with the people putting the parts together. I don't think the engine overhauls are what they were in the old days. In the war days the brand new engines were assembled then test run, then taken apart, all parts inspected, reassembled, and tested again then wrapped and boxed to be shipped. All we have to do is remember what Gary Austin said about Precision. Just saying.
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