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.
"Thanks for the high quality product and dedication of all L2 personnel involved in this project, it has been successfully completed with no issues and earlier than anticipated. All the technical, program management and support stuffs have been supportive, accommodative, proactive and very professional. It was really pleasure working with this kind of team and company. Once again L2 has set the bar high. "