Random Aeronautical Term
Major alteration
An alteration not listed in the aircraft, aircraft engine, or propeller specifications that might appreciably affect weight, balance, structural strength, powerplant operation, flight characteristics, or other qualities affecting airworthiness; an alteration not done according to accepted practices, or one that cannot be done by elementary operations.
[Source: FAA-H-8083-30B AMT Powerplant Handbook]
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