# STC SA09385AC-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-842,
- Applied: August 12, 1998
- Status date: December 8, 2000
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A7SO](https://openairdocs.org/tcds/A7SO)
- Certificate PDF: https://openairdocs.org/files/sha256/b5/6b/b56bfc1c6bbe7253c2eada851901d7dfb74e6887716cdfed054e33ea0e116840
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6B60A432D8BE0B8186256D7B0059F0EE.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA09385AC-D

## ADs that name it (0)

None.

## Approved models (3)

- Piper Aircraft Inc. PA-34-200 ([TCDS A7SO](https://openairdocs.org/tcds/A7SO))
- Piper Aircraft Inc. PA-34-200T ([TCDS A7SO](https://openairdocs.org/tcds/A7SO))
- Piper Aircraft Inc. PA-34-220T ([TCDS A7SO](https://openairdocs.org/tcds/A7SO))

## What the certificate says

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

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA09385 AC-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Certifies that the change in the type design for the foltowing product with the limitations and conditions therefor as specifed hereon meets the aincorthiness requirement's of Part 23 of the Fedoral It viation Regulations.

Original Product I ypo Certificate N rember: A7SO Make: Piper Model: PA-34-200, PA-34-200T, and PA-34-220T Description of Type Design Change:

Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-842, according to Bulletin No. 942, Revision 3, dated 12-08-00 and Master Drawing List No. 921114, Revision C, dated 12-08-00 (Field Installation) OR Master Drawing List No. 921114-1, Revision B, dated 12-08-00 (Piper Factory Installation) or later FAA Approved revisions of the above data (28 Volt System).

(See Continuation Sheet, Page 2, 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.

Date of Application: 8-12-98 Date wisued:

Date of Issuance: 8-14-98 Date Amended: 6-30-99, 12-08-00 By Direction of the Administrator FEDERAL AVIATION MonkelL (Signature) TOMINSTRATO Michael Keiran DAS Staff Coordinator, DAS 5 SW (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA09385AC-D Limitations and Conditions: (con't.)

1. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891783, dated 8-14-98 is required for Piper Models PA-34-200T and PA-34-220T or later FAA Approved revisions of the above supplement.

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891784, dated 8-14-98 is required for Piper Model PA-34-200 or later FAA Approved revisions of the above supplement.

3. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891850, dated 6-30-99 is required for Piper model PA-34-220T with Trim Monitor or later FAA Approved revisions of the above supplement.

4. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891851, dated 6-30-99 is required for Piper model PA-34-220T with Yaw Damper System or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891783, Revision 1, dated 12-08-00 is required for Piper models PA-34-200T and PA-34-220T for S-TEC System 55/55X or later FAA Approved revisions of the above supplement.

6. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891784, Revision 1, dated 12-08-00 is required for Piper model PA-34-200 for S-TEC System 55/55X or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891850, Revision 1, dated 12-08-00 is required for Piper model PA-34-220T for S-TEC System 55/55X with Trim Monitor or later FAA Approved revisions of the above supplement.

8. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891851, Revision 1, dated 12-08-00 is required for Piper model PA-34-220T with Yaw Damper System or later FAA Approved revisions of the above supplement.

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

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) from (Name of grantor) (Print or type) (Address of grantor) (Number & street) (City, State, and ZIP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- December 8, 2000: Amended, Current. [certificate](https://openairdocs.org/files/sha256/b5/6b/b56bfc1c6bbe7253c2eada851901d7dfb74e6887716cdfed054e33ea0e116840)

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