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## Major Alteration and Repair 

Within the following text, information concerning major repairs or major alterations does not apply to any aircraft within the light-sport category. This category of aircraft is not eligible for major repairs or alterations. 

Any major alteration or repair requires the work to be done by an FAA-certificated mechanic or repairman or facility. The work must be checked for conformity to FAA-approved data and signed off by an aircraft mechanic holding an Inspection Authorization (IA) or by an authorized agent of an appropriately rated FAA-approved repair station. A Repair Station record and/or FAA form 337, Major Repair and Alteration, must be completed describing the work. (Reference Title 14 of the Code of Federal Regulations (14 CFR) part 43, appendix B, for the recording of major repair and alterations requirements.) A dated and signed revision to the weight and balance record is made and kept with the maintenance records, and the airplane’s new empty weight and empty weight arm or moment index are entered in the POH/AFM. 

## Weight and Balance Revision Record 

Aircraft manufacturers use different formats for their weight and balance data, but Figure 7-3  is typical of a weight and balance revision record. All weight and balance records should be kept with the other aircraft records. Each revision record should be identified by the date, the aircraft make, model, and serial number. The pages should be signed by the person making the revision and his or her certificate type and number must be included. 

The computations for a weight and balance revision are included on a weight and balance revision form. Appropriate fore-and-aft extreme loading conditions should be investigated and the computations shown. The date those computations were made is shown in the upper right corner of Figure 7-3 . When this work is superseded, a notation must be made on the new weight and balance revision form, including a statement that the new computations supersede the computations dated “MM/DD/YY.” 

