There was a lot of very poor workmanship at some point in the history of this aircraft - bad flares, poorly routed hydraulic lines, etc. However the critical issue was a few sections of galvanic corrosion due to improperly securing the lines.
If it was actually "galvanic" then alodine will not prevent it. You would need a dissimilar metal barrier to prevent it. But as stated no alodine needed on new lines.
show me
Hydraulic lines are made IAW with drawings not the 43.13. any of 5052-0/6001-0 are not to be used as pressurized lines.
Hydraulic lines are made IAW with drawings not the 43.13. any of 5052-0/6001-0 are not to be used as pressurized lines.
https://www.flight-mechanic.com/rigid-fluid-lines-tubing-materials-material-identification-sizes/
I was a AMH for 22 years, the hydraulic lines I have made can be measured in miles
FYI: if the lines you replaced still had the original colored ID tags/decals installed that stated which system it was part of, the color code of that tag relates to the type material the line was mfg'd from. For example, a tag with a blue/yellow color band indicates 6061 aluminum.
What might seem unusual for a 1960 vintage certificated aircraft is the fact that factory drawings, or a useful service/parts manual does not exist for my model aircraft. I own four of this same model plane and at least one of them contains virtually all of the original parts (including the flexible hoses) from 1960. So no, I am not fabricating from any drawing, but I am trying to replicate the configuration and routing of the various lines, making common sense improvements when appropriate and which conform to 43.13-1B standards. I don't recall seeing any color-coded tags on any of the numerous lines, however I am going to double-check this. As an engineer, the lack of documentation really frustrates me but does not stop me from making good decisions. Diligent research and (usually) good advice from the forums is a tremendous help.
The newer tags look like this. Couldn't find pics of older versions. What model aircraft?
Interesting... thanks for this info! Plane is a Bellanca Cruisemaster.
On the drawings, have you tried contacting the National Air and Space Museum Archives to see if they have copies? Their collection on Giuseppe Bellanca is rather large and includes "drawings." The archive people may either be able to provide copies or perhaps know of some others? Great group of people. Here's a couple links. Hit the "contents" button in the 1st link for more detail. The 2nd link is a PDF version of the 1st link.
Yes, I have been in contact with them over the years. Giuseppe sold the company in the mid-50's and what information the NASM has relates mainly to the older models - valuable information for sure. The later Cruisemaster type certificate and assets were not part of the package donated to the NASM. These newer assets, drawings included, still exist with a surviving organization operated by a couple of old-timers that have been extremely helpful to myself and other owners. They stock various spare parts and have quite a collection of drawings. However there is a fundamental problem: every Bellanca built was handmade and slightly different. Drawings for many parts simply never existed, or the actual parts used on any specific ship did not conform to whatever documentation might have existed at the time. Many component parts were acquired as war surplus or from whatever source happened to be available with what little cash the company had. Then there is the fact that most every aircraft built in the decades of the 50's & 60's has been modified or hacked up by a succession of mechanics or owners that did whatever they wanted to do, and for the most part without documenting these changes. For those accustomed to the detailed documentation produced by the likes of Cessna, Beech, Piper and other manufacturers, many would wonder how a production aircraft could exist - or be certified - lacking these resources. Bottom line is that we love these machines, but keeping them in first class condition is challenging.
I am examining the size and layout of the hydraulic lines in all four of my aircraft (all four are the same model and vintage). All four are different, however I am using my best judgment on the correct fabrication and routing of these lines. Actually they are all 3/16 tubing, so that's one common factor... surprise!
creating a new line should not be a problem.