# STC SA09359AC-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 20/30 single and two-axis automatic flight guidance systems, Model ST-816-20/30.
- Applied: May 5, 1998
- Status date: July 15, 2008
- Product: Aircraft, Single-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS A1EA](https://openairdocs.org/tcds/A1EA)
- Certificate PDF: https://openairdocs.org/files/sha256/52/fe/52fe2e3f608ecd27c26b2174e11649a9b403431e5df46d856892afc212796602
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/51FAE7971EE552EB862574CF007B7ACA.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA09359AC-D

## ADs that name it (0)

None.

## Approved models (2)

- The New Piper Aircraft Inc. PA-30 ([TCDS A1EA](https://openairdocs.org/tcds/A1EA))
- The New Piper Aircraft Inc. PA-39 ([TCDS A1EA](https://openairdocs.org/tcds/A1EA))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

This Certificate issued to

Part 3 of the Civil Air Regulations.

Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-816- 20/30, according to Bulletin No. 916, Revision 3, dated 7-18-08 and Master Drawing List No. 921089, Revision C, dated 7-18-08 or later FAA Approved revisions of the above data (14 Volt System).

1. Also Eligible on The Above Models Wh en Modified Per STC SA727WE (Tip Tanks).

(See Continuation Sheet, Page 3, a part of this STC.)

If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 A1EA Piper Make :

Model : PA-30 and PA-39

Date of application : 5-05-98 Date of issuance : 5-07-98 Date reissued :

Date amended : 7-18-08

(Signature)

James W. Smisek DAS administrator, DAS-100.2 (Title)

Limitations and Conditions (con’t.)

2. FAA/DAS Approved Pilot’s Operating Handbook a nd/or Airplane Flight Manual Supplement, P/N 891718, Revision 1, dated 7-18-08 is required for Piper Models PA -30 and PA-39 And The Above Models When Modified Per STC SA727WE (Tip Tanks) S-TEC System 20 or later FAA Approved revisions of the above supplement.

3. FAA/DAS Approved Pilot’s Operating Handbook a nd/or Airplane Flight Manual Supplement, P/N 891719, Revision 1, dated 7-18-08 is required for Piper Models PA -30 and PA-39 And The Above Models When Modified Per STC SA727WE (Tip Tanks) S-TEC System 30 or later FAA Approved revisions of the above supplement.

4. Compatibility of this modification with other previous ly approved modifications must be determined by the installer.

Transfer the ownership of Supplemental Type Certificate Number

to (Name of transferee)

(Address of transferee) (Number and street)

(City, State, and ZIP code)

from (Name of grantor) (Print or type)

(Address of grantor) (Number and street)

(City, State, and ZIP code)

Signature of grantor (In ink):

## Every issue (1)

- July 15, 2008: Amended, Current. [certificate](https://openairdocs.org/files/sha256/52/fe/52fe2e3f608ecd27c26b2174e11649a9b403431e5df46d856892afc212796602)

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