Where must records of a major alteration be made?

Records of a major alteration must be documented in the aircraft maintenance records and on FAA Form 337. This requirement is crucial because FAA Form 337 serves as the official report that documents major repairs and alterations made to an aircraft. It details the nature of the change, the method of accomplishment, and includes necessary endorsements and signatures.

The inclusion of this form in the maintenance records ensures that the history of modifications is accurately maintained and can be tracked for future inspections, ownership transfers, or regulatory purposes. This level of documentation protects the integrity of the aircraft's airworthiness and complies with Federal Aviation Administration regulations, thereby ensuring safety in aviation operations.