Final answer:
Airframe alterations are considered major except when listed as minor alterations, which do not require the same level of FAA documentation or approval. The distinction between major and minor alterations is important for compliance with aviation regulations.
Step-by-step explanation:
Airframe alterations of the type found in 14 CFR part 43, appendix A, are considered major alterations except when they are listed in the category of minor alterations. Minor alterations typically do not require the same level of documentation or approval from the Federal Aviation Administration (FAA). The FAA defines a major alteration as one that might significantly affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other qualities affecting airworthiness or environmental compliance.
According to 14 CFR part 43, appendix A, minor alterations are those that do not change the aircraft's weight and balance, do not affect its structural strength, performance, powerplant operation, flight characteristics or other qualities affecting airworthiness, and do not have an appreciable effect on the plane's environmental characteristics. This information is crucial for aircraft maintenance professionals and operators to ensure proper compliance with aviation regulations.