Replacement of Cleveland brake discs, P/N 164-22A, and/or 164-23 or 164-123, with Appalachian Accessories' stainless steel brake discs, P/N 75-23.
Addition of Hydro Seal Fluid Additive to landing gear shock struts.
Replacement of certain BF Goodrich pneumatic deicer boots
Installation of composite construction wingtips with Hoernr chordwise section with a clear plexiglass nose enclosure for aircraft lighting. (PA-28, -28R, -32, -32R, -34 series MODELS WITH CONSTANT-CHORD WINGS)