FAA Form 337 (10/06)  NOTICE  Weight and balance or operating limitation changes shall be entered in the appropriate aircraft record. An alteration must be compatible with all previous alterations to assure continued conformity with the applicable airworthiness requirements. 8. Description of Work Accomplished (If more space is required, attach additional sheets. Identify with aircraft nationality and registration mark and date work completed.) Nationality and Registration Mark Date  Additional Sheets Are Attached  Figure 4-173.  FAA Form 337, Major Repair and Alteration (Airframe, Powerplant, Propeller, or Appliance) continued. 4-96