Manufacture of Replacements Windows and Windshields in accordance with Aeronautical Accessories, Inc. Drawing List Report No. AA-98155, no revision, dated October 21, 1998, or later FAA approved revisions, and installation per “Installation Instructions” listed in that report.

Replacement of the original landing gear skid tubes with DART Model D105-674-011 skid tubes

Installation of airframe structural provisions for tie-downs. (BO-105C VARIANTS CB-2 CB-2) (BO-105S VARIANTS CBS-2 CBS-4)