Surely checked the same as any other pma parts? Hundreds available out there for Alison 250's, blades on JR's and 500's. Huey, 204,205,212 blades, can get all sorts of parts for 500's and older machines, from different manufacturers, so what would be the difference for TT straps? Sure if they fail not a pretty picture, but that goes for a few parts on a helicopter...