In my case, my NLG leg was replaced back in 2009 with the then-new part number D41-3223-10-00_1, which terminated the need for these inspections. But this new SB says BOTH the old and new legs need the inspection, and there is a third NEWER leg, part number D41-3223-10-00_02, which is now a terminating action for this inspection.For airplanes equipped with the D41-3223-10-00 nose landing gear leg, within the next 25 hours of operation if operated on unprepared surfaces, or within the next 100 hours of operation if operated on paved surfaces. Inspection must be repeated every 100 hours thereafter.
For airplanes equipped with the D41-3223-10-00_1 nose landing gear leg, and with a TTAF of 3000 hours or greater, within the next 25 hours of operation if operated on unprepared surfaces, or within the next 100 hours of operation if operated on paved surfaces. Inspection must be repeated every 100 hours thereafter.
The terminating action of this service bulletin is the installation of a D41-3223-10-00_2 or later nose landing gear leg.
Here is a link to the new SB.