STC SA256NW

Supplemental type certificate · Williams Robert or Barbara

Holder: Williams Robert or Barbara · United States
Status: Current · Amended
Status date: April 12, 1993
Applied: November 3, 1975
Product: Aircraft · Single-Engine
Certification basis: Part 21
Data sheets: TCDS3A19 TCDSA-799 TCDS3A12 TCDS3A17 TCDS5A6 TCDS3A13 TCDS3A24 TCDS3A21

From FAA DRS, with our copy of the certificate PDF. DRS record last changed December 6, 2025.

What it approves

Installation of aileron gap seals.

From the PDF’s text layer, without the form’s printed wording. Layout and order may differ; the PDF is the record.

This certificate is a scan without a text layerOpen the PDF to read it.

An AD can apply because an STC is installed, or mention one in its text.

No AD in this release names this STC