# STC SA7821SW-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC system 60 pitch stabilization system, model ST-487, with optional automatic electric trim system.
- Applied: July 10, 1992
- Status date: July 17, 1992
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 2A13](https://openairdocs.org/tcds/2A13)
- Certificate PDF: https://openairdocs.org/files/sha256/8f/e7/8fe7c4638c7d8fdc877399222aacad6213ffff30cc7f5a15c1fb89ce1a65f48c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CC9446399484DDE585256CC20056A4CB.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA7821SW-D

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-28-235 ([TCDS 2A13](https://openairdocs.org/tcds/2A13))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA78215W-D This contificate, issusa lo S-TEC Corporation 946 Pegram Wolters Industrial Park Mineral wells, Texas /6067 Certifies that the change in the type design for the following product with the limitations and conditions Shorefor as specifed homon mects the sivvorhiness requinements of Port 3 of the CiVil Air Rogulations.

Original Product -Typo Certificator Numben: 2A13 Make: PIPER Model: PA-28-235 Description of Type Design Change:

Installation of S-TEC System 60 Pitch Stabilization System, Model ST-487, with Optional Automatic Electric Trim System, according to Bulletin No. 587, dated 7-08-92 and Master Drawing List No. 92568, dated 7-08-92 (14 Volt System).

1. Eligible only on Piper Model PA-28-235, S/N 28-7310001 & Up.

2. FAA/DAS Approved Airplane Flight Manual Supplement, P/N 89981, dated /-17-92 1s required tor Piper Model PA-28-235, S/N 28-7310001 & Up and/or later FAA Approved revisions of the above supplement.

3. Compatibility of this modification with other previously approved modifications must be determined by the installer.

Thomas DAS Staff Coordinator, DAS 5 SW (Title)

This certificate may be transferred in accordance with FAR 21.17.

Pad Foom 8110-2 (10-68)

The FAA will reissuc the certificate in the name of the transferee and forward it to him.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number.

to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code) trom (Name of grantor) (Print or type) (Address of grantor) (Numher and streel) ( City. State, and 21P code ) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- July 17, 1992: Issued, Current. [certificate](https://openairdocs.org/files/sha256/8f/e7/8fe7c4638c7d8fdc877399222aacad6213ffff30cc7f5a15c1fb89ce1a65f48c)

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