Where should major repair or alteration descriptions be documented?

Major repair or alteration descriptions should be documented on an FAA Form 337 because this form is specifically designed for that purpose. The FAA Form 337 serves as an official record that provides detailed information about major repairs or alterations made to an aircraft. It ensures that the integrity and safety of the aircraft are maintained while complying with regulatory requirements. This form must be filed with the FAA and is integral to maintaining accurate maintenance records, which is crucial for future inspections, possible repairs, and the overall assurance of the aircraft's operation.

While the aircraft's owner's manual and logbook contain valuable information regarding the general maintenance and operation of the aircraft, they are not designated for documenting major repairs or alterations specifically. These documents may provide context or summaries of maintenance, but they won't contain the detailed, regulatory-required information that the FAA Form 337 captures. Keeping a spreadsheet of repairs, while potentially useful for organization, does not meet the formal requirements set forth by the FAA for documenting major alterations or repairs.