Substituting a lighter gage metal may result in a fitting that lacks the rigidity it needs for a particular function and location. Sometimes a fitting could be made of a lighter gage and still have the strength necessary for its assigned function. This means the correct steel alloy or aluminum alloy should be used, and in the thickness designated. You should abide by the designer's plans call-out. Using the proper material for making the fittings is very important. They are important, indeed! Poorly made fittings can result in lost wings in flight, the engine falling out, the gear busting off and other even more serious consequences. Additionally, they are difficult to analyze accurately and pose installation and alignment problems which would not exist if the structure were in one piece.ĭon't let these introductory remarks dupe you into assuming that fittings are unimportant. FITTINGS, ALTHOUGH UNDESIRABLE from a design-structural point of view, are, none the less, essential because to build a one-piece airplane would impose horrendous construction conditions on any builder (or manufacturer).įittings are undesirable because they add weight, because they add to the cost of construction, because they add to the time taken to build, and because they add to the complexity of the structure.
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