# STC SA09285AC-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model   ST-727-20/30, according to Bulletin No. 827, Revision 6, dated 1-21-11 and Master Drawing List No. 921029, Revision F, dated 1-21-11 or later FAA Approved revisions of the above data (28 Volt System).
- Applied: October 10, 1997
- Status date: February 24, 2011
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS A20SO](https://openairdocs.org/tcds/A20SO)
- Certificate PDF: https://openairdocs.org/files/sha256/cf/31/cf318fe42a294e25e941509af2385f55a9eb4352d8e9aceded3f83629371168a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/339C9D025C70F54E86257855004484A4.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA09285AC-D

## ADs that name it (0)

None.

## Approved models (4)

- Piper Aircraft Inc. PA-31 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))
- Piper Aircraft Inc. PA-31-300 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))
- Piper Aircraft Inc. PA-31-325 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))
- Piper Aircraft Inc. PA-31-350 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO))

## 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-727-20/30, according to Bulletin No. 827, Revision 6, dated 1-21-11 and Master Drawing List No.

921029, Revision F, dated 1-21-11 or later FAA Approved revisions of the above data (28 Volt System).

(See Continuation Sheet, Page 3 and 4, a part of this STC.)

If the holder agrees to permit another person to use th is 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 A20SO Piper Make :

Model : PA-31, PA-31-300, PA-31-325, and PA-31-350

Date of application : 10-10-97 Date of issuance : 10-14-97 Date reissued : 2-24-11 Date amended : 12-09-97, 5-01-01

(Signature)

Randy Harper ODA-100.3 ODA Administrator, ODA-700096-SW (Title)

FAA Form 8110-2-1(10-69) Page 2 of 4

Number SA09285AC-D Date Amended 2-24-11

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):

FAA Form 8110-2-1(10-69) Page 3 of 4

Number SA09285AC-D Date Amended 2-24-11

Limitations and Conditions (con’t.)

1. Also eligible on Models PA -31 and PA-31-300 When Modified Per STC SA970SO (350 H.P. Colemill Conversion).

2. Also eligible on Model PA-31-325 When Modi fied Per STC SA00048SE (Vortex Generator System).

3. Also eligible on model PA-31-350 when modifi ed per STC SA1151SO (Colemill Panther II conversion) and/or any of the following STCs: STC SA5796NW, STC SA00192SE, STC SA00039SE, STC SA00126SE (vortex generators and gross weight increase).

4. FAA/DAS Approved Pilot’s Operating Handbook a nd/or Airplane Flight Manual Supplement, P/N 891538, dated 10-14-97 is required fo r Piper Models PA-31 and PA -31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) for S-TEC System 20 or later FAA Approved revisions of the above supplement.

5. FAA/DAS Approved Pilot’s Operating Handbook a nd/or Airplane Flight Manual Supplement, P/N 891549, dated 10-14-97 is required fo r Piper Model PA-31-325 And The Above Model When Modified Per STC SA00048SE (Vortex Generator System) for S-TEC System 20 or later FAA Approved revisions of the above supplement.

6. FAA/DAS Approved Pilot’s Operating Handbook a nd/or Airplane Flight Manual Supplement, P/N 891539, dated 10-14-97 is required fo r Piper Models PA-31 and PA -31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) for S-TEC System 30 or later FAA Approved revisions of the above supplement.

7. FAA/DAS Approved Pilot’s Operating Handbook a nd/or Airplane Flight Manual Supplement, P/N 891550, dated 10-14-97 is required fo r Piper Model PA-31-325 And The Above Model When Modified Per STC SA00048SE (Vortex Generator System) for S-TEC System 30 or later FAA Approved revisions of the above supplement.

8. FAA/DAS Approved Pilot’s Operating Handbook a nd/or Airplane Flight Manual Supplement, P/N 891538, Revision 1, dated 12-09-97 is required for Piper Models PA-31 and PA-31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) for S-TEC System 20 or later FAA Approved revisions of the above supplement.

9. FAA/DAS Approved Pilot’s Operating Handbook a nd/or Airplane Flight Manual Supplement, P/N 891539, Revision 1, dated 12-09-97 is required for Piper Models PA-31 and PA-31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) for S-TEC System 30 or later FAA Approved revisions of the above supplement.

FAA Form 8110-2-1(10-69) Page 4 of 4

Number SA09285AC-D Date Amended 2-24-11

Limitations and Conditions (con’t.)

10. FAA/DAS Approved Pilot’s Operating Handbook and/ or Airplane Flight Manual Supplement, P/N 891549, Revision 1, dated 12-09-97 is required for Piper Model PA-31-325 And The Above Model When Modified Per STC SA00048SE (Vortex Generator System) for S-TEC System 20 or later FAA Approved revisions of the above supplement.

11. FAA/DAS Approved Pilot’s Operating Handbook and/ or Airplane Flight Manual Supplement, P/N 891550, Revision 1, dated 12-09-97 is required for Piper Model PA-31-325 And The Above Model When Modified Per STC SA00048SE (Vortex Generator System) for S-TEC System 30 or later FAA Approved revisions of the above supplement.

12. FAA/DAS Approved Pilot’s Operating Handbook and/ or Airplane Flight Manual Supplement, P/N 892081, dated 5-01-01 is required fo r Piper model PA-31-350 and mode l PA-31-350 when modified per STC SA1151SO (Colemill Panther II conversion) and/ or any of the following STCs: STC SA5796NW, STC SA00192SE, STC SA00039SE, STC SA00126SE (vortex generators and gross weight increase) for S-TEC System 20 or later FAA Approved revisions of the above supplement.

13. FAA/DAS Approved Pilot’s Operating Handbook and/ or Airplane Flight Manual Supplement, P/N 892082, dated 5-01-01 is required fo r Piper model PA-31-350 and mode l PA-31-350 when modified per STC SA1151SO (Colemill Panther II conversion) and/ or any of the following STCs: STC SA5796NW, STC SA00192SE, STC SA00039SE, STC SA00126SE (vortex generators and gross weight increase) for S-TEC System 30 or later FAA Approved revisions of the above supplement.

14. FAA/ODA Approved Pilot’s Operating Handbook and/ or Airplane Flight Manual Supplement, P/N 892081, Revision 1, dated 2-24-11 is required for Piper model PA- 31-350 and model PA-31-350 when modified per STC SA1151SO (Colemill Panther II conve rsion) and/or any of the following STCs: STC SA5796NW, STC SA00192SE, STC SA00039SE, STC SA00126SE (vortex generators and gross weight increase) for S-TEC System 20 or later FAA Approved revisions of the above supplement.

15. FAA/ODA Approved Pilot’s Operating Handbook and/ or Airplane Flight Manual Supplement, P/N 892082, Revision 1, dated 2-24-11 is required for Piper model PA- 31-350 and model PA-31-350 when modified per STC SA1151SO (Colemill Panther II conve rsion) and/or any of the following STCs: STC SA5796NW, STC SA00192SE, STC SA00039SE, STC SA00126SE (vortex generators and gross weight increase) for S-TEC System 30 or later FAA Approved revisions of the above supplement.

16. Compatibility of this modification with other previ ously approved modifications must be determined by the installer.

## Every issue (1)

- February 24, 2011: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/cf/31/cf318fe42a294e25e941509af2385f55a9eb4352d8e9aceded3f83629371168a)

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