Your Stearman: STC’s/Field approvals/337’s, What you need to know

Confusion often surrounds STCs (Supplemental Type Certificates), FAA Field Approvals, and 337s (FAA Form) as they relate to aircraft modifications.  When are they used?  How are they used?  How can you tell the difference between them? As Stearman owners, we need to understand these methods of making approved modifications to [...]