Supplemental Type Certificates - Variants

One-Only STC

A “One-only” STC may be issued for a particular aircraft, identified by make, model, and serial number. A one-only STC cannot be amended and the holder is not eligible for production approval. Application for a multiple STC is required for subsequent approvals of the modification.

Non-Interference STC

A non-interference, or no-hazard, STC addresses a convenience function modification that is not required by the applicable airworthiness standards. The STC Limitations and Conditions section specifies the extent, or limitation, of the modification approved by the FAA.

Last updated: Friday, July 7, 2023