L2 Aviation issues supplemental type certificate (STC) which are a type certificate (TC) issued when an applicant has received FAA approval to modify an aeronautical product from its original design. The STC, which incorporates by reference the related TC, approves not only the modification but also how that modification affects the original design.
"This project has taken us places that we never expected. The upside is, we have a much more capable product to offer our customers. We at Rockwell Collins appreciate the efforts of all involved. "