| http://www.w3.org/ns/prov#value | - Before we get into the nuts and bolts, so to speak, understand that while model-specific parts (control surfaces and cowlings, for example) must come from the manufacturer or a supplier that has received Federal Aviation Administration approval in the form of a Parts Manufacturer Approval (PMA. The key here is that the part must conform to some sort of standard, usually a military specification, o
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